Electric motor with low rpm, in particular for actuation of lifting devices
SUBSTANCE: invention refers to the field of electric engineering, in particular, to electric machines, and relates to features of design of electric motors with low rpm. Electric motor (10) is proposed with low rpm, comprising rotor (17), with supply from source of three-phase AC voltage, magnets (21, 22) and stator coil (24). Rotor (17), stator (24) and magnets (21, 22) are located in body (13) of pulley, which rotates around fixed axis (11), besides, rotor (17) is fixed to body (13), coil of stator (24) is arranged with supply from DC voltage source. Magnets (21, 22), forming stator (24), are fixed to axis (11) and are arranged with the possibility to locate a stator (24) coil in them, and body (13) of pulley is fixed to two diamagnetic side plates (16, 16'). Motor comprises electromagnet brake (25), including two metal disks, one of which is arranged as a whole with one of specified diamagnetic plates (16'), and the other one with magnet (22), which forms poles of stator (24), and spring pushes of disks arranged in according slots of magnet (22). To resist action of lowering braking disk, there is a thrust bearing. Besides, the possibility to control frequency of rotor voltage is provided to produce required motor rpm.
EFFECT: production of perfect working characteristics of motor with low rpm, having compact design, which does not require step-down gear.
7 cl, 1 dwg
The technical field
The present invention relates to a motor with a low number of revolutions. In particular, the present invention relates to a motor with a low number of revolutions, which is preferably used where high torque.
For example, the proposed motor can be used to actuate the lifting devices, such as elevators.
The level of technology
The motors are used where high torque, for example for lifting elevators, usually set in terms of lack of space, and this causes great difficulties, because the engine is equipped with a reduction gear and pulley, on which is wound the ropes, raising and lowering the Elevator, turns out to be very cumbersome.
Used in these areas reduce transmission are often not constant over time Electromechanical characteristics, which leads to instability and significant deterioration of the operating characteristics of the engine.
Description of the invention
Problems of the known devices is solved in the present invention by creating a compact engine is a new design that does not require a downshift.
In particular, for the elevators in the present invention proposes a motor with low the m number of revolutions (for example, approximately 50 rpm, which corresponds to the rate of climb of approximately 1 m/s), where the components necessary to move and braking cabins, can be located directly inside the drive pulley.
Signs of such a motor is described in the main claim. In dependent claims described private preferred options for implementation of the proposed motor.
In the most common configuration for the proposed motor contains a multi-pole rotor with power from a source of three-phase alternating voltage and the stator, which has the same number of magnetic poles as the rotor, and which is made in the form of a coil powered from a DC source.
According to the most preferred implementation variant of the invention a DC voltage obtained from a single-phase rectified, and therefore, the pulsating AC voltage. Constant voltage allows to obtain high performance of the engine.
Description of the drawings
Other features and advantages of the invention will become apparent from the description of some implementation options, which are non-limiting examples. Description is provided using the attached drawing, which offer the motor presented in the section.
A description of some of the variants of the invention
All the proposed motor with a low number of revolutions used to actuate the lifting devices, in the drawing, 10.
The engine 10 is mounted on bearings 12, 12' (roller or ball) on the fixed metal axle 11 and is enclosed in a housing 13 of the pulley on the outer surface of which has a series of grooves 14, 14',...designed to accommodate cables (not shown) for actuation of the lifting device, such as a lift. The housing 13 is fixed by screws 15 to the two diamagnetic side plates 16, 16', which are connected with bearings 12, 12'.
In fact, the motor is placed in the cavity formed by the plates 16, 16' and the housing 13.
On the inner surface of the pulley 13 has performed with him for one whole rotor package 17 with a number of grooves (not shown), which is designed to accommodate three-phase winding with power from a source of alternating voltage. The specified three-phase winding is connected to three respective conductive rings 18, 18', 18"which are inserted into the corresponding slots cut in the plate 16'. Attached to the axis of the flap 19 of the two interconnected parts, which holds three brushes 20, 20', 20" in contact with the respective rings 18, 18', 18".
Also to the axis 11 is attached, the magician is the ITA 21, 22, located next to each other and bounding a cavity in which is located the stator coil 24, with power from a DC voltage source to create a magnetic polarities of the stator.
The engine 10 comprises an electromagnetic brake 25 containing two metal disk, one of which is made in one piece with the plate 16'and the other with the magnet 22, and a spring-loaded plungers disks placed in the proper slots of the magnet 22.
Thus, all the necessary equipment for handling and braking can be contained in the drive pulley, so this engine is particularly suitable for use as a full-wheel drive without low gear.
According to the invention, the power supply coil 24 (DC voltage obtained by rectifying a single-phase AC voltage winding 17 (source three-phase AC voltage) is regulated by a suitable control device to obtain a desired number of revolutions, and the engine speed depends on number of poles and frequency three-phase power source.
For these purposes may be used for frequency control device, for example the inverter AC-DC-AC or DC-AC".
According to the invention, the power cat is the loud and 24 is supplied from the constant voltage source. In this embodiment, the implementation of the engine contains a large number of magnetic poles, the same as the rotor and the poles in the stator of a split, as in automotive alternators. In this case, lost some typical synchronous motor characteristics, but appears torque acceleration, which gives the possibility of obtaining the desired speed by simply changing the frequency of the three-phase power rotor.
To prevent leakage between the shaft and the coil plates 16, 16' is made of diamagnetic material.
Since the engine has three modes (constant speed, braking and acceleration), the stator 24 is continuously fed from a constant voltage source, and the rotor 17 from the source of alternating voltage, adjustable frequency Converter that is external to the rotor. In this case, the modes of acceleration and deceleration frequency three-phase voltage of the rotor 17 is controlled by frequency converters ("AC-DC-AC or DC-AC"), which provide the required frequency, current and hence torque.
In the above text, the invention is described on the example of the preferred alternative implementation, in which the main axis is stationary, the stator is made C is integral with the shaft, as the rotor rotates around the shaft and stator.
However, possible embodiments, in which the functions of the engine parts described reverse: the main axis rotates, and the motor housing, made in one piece with three-phase winding, motionless.
In this case, the main axis is equipped with two conductive rings, which are connected with the appropriate cables, inserted into the grooves of the shaft and connected with the windings of the coils and rotating magnets.
For current transfer these rings are connected to two brushes, and with the main axis are connected by a mechanical drive means, in particular lifting means.
1. The electric motor (10) with a low number of revolutions, containing a rotor (17) with power from a source of three-phase (18, 19, 20) AC voltage, the magnets (21, 22) of black metal and the coil, which forms the stator (24), and an electromagnetic brake (25), the rotor (17) and the stator (24) have the same number of magnetic poles,
the rotor (17), the stator (24) and the magnets (21, 22) are accommodated in the housing (13) pulley, which rotates around a stationary axis (11), the rotor (17) is attached to the housing (13);
the stator coil (24) is made with power from a DC voltage source, with possible frequency control voltage of the rotor (17);
magnets (21, 22)forming the stator (24), fixed to the axis (11) and is made with the possibility of the placement of the coils of the stator (24),
moreover, the housing (13) pulley fixed to the two diamagnetic side plates (16, 16'),
electromagnetic brake (25) contains two metal disk, one of which is made in one piece with one of these diamagnetic plates (16')and the other with the magnet (22), which forms the poles of the stator (24), and spring plungers disks placed in the proper slots of the magnet (22).
2. The electric motor according to claim 1 which includes the diamagnetic side plates (16, 16) are connected with two roller bearings (12, 12')that interact with the specified axis (11).
3. The electric motor according to claim 1, characterized in that it further comprises a fixed plate (19), in which there are brushes(20, 20', 20"), United with the appropriate rings(18, 18', 18"), rotating with the pulley housing and electrically connected to three-phase rotor winding.
4. The electric motor according to claim 1, characterized in that on the housing (13) of the pulley has a peripheral grooves (14) for placing the drive cables.
5. The electric motor according to claim 1, characterized in that inside it there is also a mechanical brake (25).
6. The electric motor according to any one of claim 1, characterized in that the rotor and the stator is made in one piece with the means of transmission.
7. The electric motor according to claim 6, characterized in that the means of transmission of motion contain the tooth is atou and friction gear.
FIELD: electrical engineering.
SUBSTANCE: proposed device comprises rotor accommodating permanent magnets fixed in dielectric material and running in rolling bearings between two disks of stator. The latter comprises horseshoe-shaped magnetic cores with poles and windings connected in series. Crankshaft with clutch disk and overrunning cutch disk with con-rod runs in bearing fitted in the base, said disks being fitted on opposite ends of crankshaft. Free end of said con-rod is pin-coupled with the lever linked up with rotor disk periphery. Aforesaid base supports motor with independent power supply. Flywheel is fitted on one extension of motor shaft and crankshaft clutch disk is fitted on opposite end of the shaft.
EFFECT: higher efficiency of conversion.
SUBSTANCE: present invention relates to electrical engineering and electromechanics, particularly to electric machines, and pertains to distinct features of design of a planetary electric motor - reducing gear with a lever for controlling the commutator. To increase excentricity of rotation of the commutator by several times compared to excentricity of the satellite - armature, the proposed planetary electric motor - reducing gear employs a lever for controlling the commutator. The proposed planetary electric motor - reducing gear has a planetary gear system in form of a friction pair or planetary reduction gear, the first step of which executes functions of the stator and satellite - armature of the electric motor. The commutator rotates synchronously with the satellite - armature. The stator and satellite - armature are fitted with solenoid coils, which shift the satellite - armature about the point of maximum entrance of teeth of the wheel and primary pinion of the planetary reduction gear into each other, or about the point of contact of the friction pair. The commutator, which can rotate excentrically about the housing, provides for phase shifting of the electromotive force of the electric motor and closes the solenoid coils of the stator and satellite - armature. The lever for controlling the commutator has different arms, the end of the shorter one of which engages the statellite - armature, and the end of the longer one enters the collector, providing for its rotation with excentricity, which exceeds excentricity of rotation of the satellite - armature. The commutator can be used with butt-end and cylindrical arrangement of contacts. The current input and output elements of the commutator do not rotate, they only oscillate.
EFFECT: improved operation of a planetary electric motor - armature, reduced spark formation of the brushes and electric arc from commutator contacts, as well as provision for wide regulation of frequency of rotation, torque and reversing the electric motor.
6 cl, 8 dwg
SUBSTANCE: invention is related to electric engineering and may be used in electric machine industry, namely, in electromechanical power devices, in particular, in straight-running actuating electric mechanisms for movement of working elements of different machines and in the most different areas of machine building, metallurgy, etc. Straight-running actuating electric mechanism contains casing, on which electric motor is installed as well as screw with master and slave pulleys and drive belt, protective tube with front bushing, in which stem with power nut is installed with the possibility of longitudinal displacement. Induction limit switches are installed in the window of protective tube with the possibility of precise and independent tuning motion in parallel guides provided in the form of threaded pins and slots installed in the box. On external surface of stem opposite to every limit switch deepenings are provided that are displaced in relation to each other in angular and axial direction, and inclined flat - opposite to induction position sensor installed in front bushing.
EFFECT: increase of technological resources of straight-running actuating mechanism.
5 cl, 6 dwg
FIELD: engines and pumps, electrical engineering.
SUBSTANCE: two-speed transmission (100) comprises a planetary transmission incorporating input pulley (10) coupled with the input spider (20) and a sun gear (18) and gear wheel (17). Input spider (20) contains also a large number of planetary gears (15) arranged between the sun gear (18) and gear wheel (17). Sun gear (18) comes into mesh with the electromagnetic brake element (190). Gear wheel (17) comes into mesh with output pulley (30). Idling clutch (22) is arranged between input spider (20) and output shaft (31). Brake element (190) comes into mesh with the engine idling and gets out of mesh at ratios exceeding the idling speed. When brake element (190) comes into mesh, sun gear (18) does not run thus allowing gear wheel (17) and output pulley (30) to revolve at higher speed ccompared to that of the input pulley (10).
EFFECT: expanded performances.
24 cl, 14 dwg
FIELD: electrical engineering, applicable for imparting of a precision turn, rotary and oscillatory motions to various mechanisms within a wide range of angles and angular velocities.
SUBSTANCE: the electric drive has a step motor, whose shaft is coupled to the electric drive output shaft through a reduction gear. An additional motor is kinematically linked with the output shaft of the electric drive by a belt transmission, and the torque developed by it on the output shaft exceeds the friction torque on the output shaft, but it doesn't exceed the torque on the output shaft from the step motor. The electric drive control system has a DC voltage source, step motor with a stop motor control unit, additional motor with a selector switch of the direction of its rotation. The step motor control unit is provided with control outputs, and its input is connected to the DC voltage source. The additional motor is connected to an additional supply source via the selector switch of the direction of its rotation, and its control inputs are connected to the control outputs of the step motor.
EFFECT: expanded dynamic range of rotary speeds of the output shaft, enhanced reliability, precision of the rotary speed and provided a turn of the output shaft through the preset angle.
2 cl, 4 dwg
FIELD: electrical engineering, applicable for imparting of a precision turn and rotary motion to various mechanisms within a wide range of angles and angular velocities.
SUBSTANCE: the electric drive has a step motor, whose shaft is coupled to the output shaft through a reduction gear. An additional motor is kinematically linked with the output shaft by a belt transmission, whose belt envelopes the drive and driven pulleys located respectively on the shaft of the additional motor and an the output shaft. The torque developed by the additional motor on the output shaft exceeds the friction torque on the output shaft, but it doesn't exceed the torque on the output shaft from the step motor. The electric drive control system has a DC voltage source, step motor with a step motor control unit, additional motor with a selector switch of the direction of its rotation. A DC motor is used as the additional motor, it is connected via the selector switch of the direction of its rotation to the additional DC voltage source with a drooping volt-ampere characteristic. The second modification of the electric drive and of the system of its control provides for installation of the driven pulley on the output shaft of the step motor.
EFFECT: expanded dynamic range of rotary speeds of the motor output shaft of the electric drive, enhanced reliability, precision of the rotary speed and provided a turn of the motor output shaft through the preset angle.
4 cl, 4 dwg
FIELD: electric machinery, particularly electromechanical power equipment, for mechanical engineering, metallurgy and so on.
SUBSTANCE: mechanism comprises body. Electric motor, bearing-carrying screw with pulleys and driving belt and driving belt tension control means are arranged on the body. Protective pipe is located in the body. Installed in the protective pipe is bush arranged so that the bush may slide in longitudinal direction along guider inside the bush by means of rod with power nut and head. Dowel of rod rotation prevention means and bearing clamping nut are secured to inner surface of protective pipe. The bearings are connected to screw through intermediate bush. Mechanical retaining means, which fixes bearing clamping nut inside the body, is located on the bearing clamping nut. Protective pipe is provided with inductive end switches. Stops are inserted inside protective pipe from both ends thereof. Longitudinal groove, radial orifice and outer bead are provided in rod end. The outer bead may cooperate with the stops. Insert is introduced into longitudinal groove and radial orifice so that the insert encloses the dowel by side surfaces thereof. The insert is provided with projection arranged in dowel slot of power nut located inside the rod. Intermediate bush is made as an integral part and connected to screw by means of fixing member installed in place of any bearing installation.
EFFECT: increased reliability.
5 cl, 6 dwg
FIELD: electrical and general mechanical engineering; self-braking motors built around squirrel-cage induction motors.
SUBSTANCE: stator and rotor contacting surfaces of motor-brake built around squirrel-cage induction motor are provided with taper thread; rotor shaft is supported on one end by radial bearing and on other one, by thrust bearing with spacer disk affording cohesion between stator and rotor threaded surfaces during reverse movement of rotor; shaft extension of the latter is splined.
EFFECT: simplified design, enhanced reliability of brake-motor.
1 cl, 2 dwg
FIELD: electrical engineering.
SUBSTANCE: proposed face-type electrical machine has single-disk stator and single-disk rotor, as well as reliable built-in braking device affording motor stopping as soon as field winding is deenergized. Rotor disk is coupled with rotor shaft through splined joint admitting axial displacement of rotor disk relative to shaft. Braking device disposed on one of bearing end-shields of machine frame is equipped with adjusting members enabling desired positioning of rotor disk inside annular space of machine and adjustment of brake spring pressure. Shaped supports are used for installing stator core separated from rotor core by air gap which are rigidly coupled with stator core and are free to displace relative to bearing end-shield whereon they are all secured upon setting desired air gap.
EFFECT: reduced size, facilitated maintenance, enhanced operating reliability.
6 cl, 1 dwg
FIELD: electromechanical engineering.
SUBSTANCE: proposed high-speed electrical machine has stator and rotor whose shaft journal is clamped by external rings of at least three bearings installed on eccentric axles coming in mesh with auxiliary-motor rotor. Free-running unit is introduced to prevent departure of mentioned parts from one another as they wear down that functions to control turn of auxiliary-motor rotor only in direction affording tightening of shaft journal bearings by external rings. Free-running unit that functions to reduce vibration and radial thrusts on bearings is made in the form of free-wheel clutch whose driven member is rigidly fixed on frame. Driving member is auxiliary-motor rotor. In the course of running rotor takes plays due to wear-down of contacting parts under action of torque.
EFFECT: enhanced reliability and enlarged service life of electrical machine.
2 cl, 2 dwg
SUBSTANCE: single-phase contact-free electromagnetic generator includes stator with anchor core composed of insulated electrical steel sheets of high magnetic inductivity and features distinct poles with single-phase anchor coil winding where each coil is positioned at respective distinct anchor pole, and winding-free ferromagnetic rotor including inducer with even and odd cores with the same number of distinct poles in each core. Odd and even inducer cores are made in the form of banks assembled of insulated electric steel sheets of high magnetic inductivity, inducer features at least two cores, even inducer cores are shifted against odd cores in tangential direction for a pole half-pitch of inducer core, inducer cores are set on respective magnetic conductors of inducer, annular layers of segmental permanent magnets magnetised in the one direction are positioned between magnetic conductors of inducer. Certain ratio should be maintained between number of distinct anchor poles and number of distinct poles in each inducer core, and between pole arc width of distinct anchor poles and pole arc width of distinct poles of each inducer core.
EFFECT: high reliability and manufacturability of single-phase electromagnetic generator design, good energy and operational characteristics.
9 cl, 4 dwg
SUBSTANCE: invention is related to the field of electric engineering, in particular to contactless DC electric motors and may be used in electric drive, where it is necessary to combine properties of contactless DC electric motor with hollow rotor specific for commutator electric motors. In proposed DC electric motor, comprising hollow nonmagnetic rotor with anchor winding, magnetic system on the basis of one or several permanent magnets, according to this invention, rotor comprises electronic commutator with internal rectifier, which is fixed on electric motor shaft, connected with anchor winding supplied with AC voltage from secondary winding of rotary transformer, installed on shaft of electric motor, besides primary winding of rotary transformer is installed on electric motor stator and is intended for connection to external source of power supply via frequency converter.
EFFECT: provision of high resource with high performance and efficiency factor.
3 cl, 2 dwg
FIELD: electrical engineering.
SUBSTANCE: invention relates to electrical engineering and electric power engineering, namely to electrical machines. Electrical machine with constant magnets comprises one or more magneto-electrical machines. Each magneto-electrical machine is provided with circular stator with constant magnets in the form of C-shaped hollow torus sections in the cross section, axially magnetised and installed towards each other by unlike poles at a distance equal to magnet length. Electro magnets being fixed to massive rotor brackets are placed inside stator. Electromagnets are equal to the constant magnet length, but its quantity is unequal to the number of constant magnets, which is more than two. They are distributed around the circle so that only one magnet could be stable at a single stage when rotor displaces in the stator cavity in more than one electromagnetic machine, i.e. in a group of machines locating on the same shaft. The electrical machine with constant magnets having several magneto-electrical machines installed on the same shaft can function as not only motor and generator, but also combine both functions.
EFFECT: increased efficiency factor of electrical machine.
FIELD: electro-mechanical engineering, in particular, constant current electric machines with constant magnets, possible use in electric motors and constant current generators.
SUBSTANCE: in known stator of constant current electric machine with constant magnets, containing closed magneto-conductive yoke, polar constant magnets, mounted with alternating polarity on the stator axis, and polar tips, made of magneto-soft material and positioned on constant magnets on the side of air gap, in accordance to invention, symmetrically between neighboring poles (in inter-polar space) sectors made of non-magnetic materials are mounted, on sectors on the side of air gap, inter-polar flat constant magnets are positioned, having tangential magnetization, oriented with polarity of the same name to nearby polar tips and divided by nonmagnetic gap with polar magnets and polar tips, length-wise magnets are made within limits of stator poles along the axis of machine and oriented in parallel to polar magnets and tips. Inter-polar magnets are held on sectors with possible movement in radial direction.
EFFECT: increased power due to increased working magnetic flow and increased stability of output characteristics due to possible adjustment thereof.
2 cl, 3 dwg
FIELD: electrical engineering; gearless drives primarily used for vehicles.
SUBSTANCE: proposed motor has circular stator core with permanent magnets symmetrically disposed on its outer and inner surfaces over its circumference in alternating polarity and through core thickness in opposing polarity; it also has double-section rotor one of whose sections encloses stator and functions as external section while other section is disposed inside stator and functions as internal section. In addition motor has commutator-type current distributor and current collector both mounted for contacting commutator-type distributor segments and are connected to area of electromagnets of mentioned rotor sections.
EFFECT: enhanced motor torque.
3 cl, 2 dwg
SUBSTANCE: electric drive with synchronous reluctance machine includes two groups of three-phase (multi-phase) windings with full pitch, which are uniformly distributed along inner stator bore, and rotor position sensor. Electric drive is equipped with thyristor commutator, current sensor, which are connected between cathode and anode groups of commutator; at that, windings of similar stator phases are connected to each other according to and in series so that spatial magnetic axes of those windings are mutually orthogonal. Beginnings of windings of the first group are connected to power line and the ends of the second group are connected to the input of thyristor commutator. Besides, current sensor output is connected to one of the inputs of current control the second input of which is connected to the source for setting current value, and output of current control and rotor position sensor is connected to thyristor commutator. As per the signal supplied from rotor position sensor output, control pulses are supplied to two fans of opposite groups of thyristor commutator so that true neutral plane of motor can get under the trailing edge of rotor pole.
EFFECT: improving reliability in operating conditions with high angular speeds and high moment overloads, with severe and extremely severe operating conditions, possible operation of the device both in motor and in braking conditions of electric machine.
2 cl, 4 dwg
SUBSTANCE: in the proposed synchronous reluctance machine there is multiphase power winding on a stator that is evenly distributed along the inner bore of the stator and serves for connection to valve inverter, and also multiphase exciting winding located in stator grooves and serving for connection to controlled exciters. According to the invention each phase of multiphase exciting winding is laid in one of the grooves of each stator phase zone in the centre of this zone, groove section represents equilateral trapezium with the base at stator backside. Note that groove walls formed by teeth are tilted towards each other.
EFFECT: reduction of synchronous reluctance machine rotor heating ensured by decreasing of magnetic losses caused by pulses of exciting magnetomotive forces.
SUBSTANCE: invention relates to the field of electric engineering and designs of contactless reducer electromagnetic machines with electromagnet reduction, intended for use as motor - wheels, motor - drums, direct drives in electrical appliances (electric meat grinders, washing machines, etc), electric drives of concrete mixers, weight-lifting mechanisms, belt conveyors, pumps for pumping of fluids, mechanisms with high torque on shaft and low frequencies of shaft rotation, and also as high-frequency electric generators. Proposed contactless reducer electromagnet machine comprises stator with explicit poles, on inner surface of which there are elementary cogs, m-phased focused anchor winding of which consists of coils, each coil covering an appropriate anchor pole, and winding-free ferromagnetic rotor, comprising two inductor cores displaced relative to each other in tangential direction by half of gear division, with toroid permanent magnet magnetised in axial direction and installed between cores of inductor, to develop magnetic flow of excitation. At the same time certain ratios are maintained between number of anchor poles, number of elementary teeth on anchor pole, number of anchor poles in phase, common number of anchor teeth, number of teeth on each inductor core and number of phases of anchor winding of contactless reducer electromagnetic machine.
EFFECT: high power and operational indices, high specific rotary torque on shaft and high electromagnetic reduction of rotation frequency in mode of electric motor, high specific capacity at high frequencies of electromotive force in mode of electric generator.
12 cl, 14 dwg, 1 tbl