Electric motor with low rpm, in particular for actuation of lifting devices

FIELD: electricity.

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.



 

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