Drive-transformer unit

FIELD: electricity.

SUBSTANCE: transformer part of a unit is made with a primary winding connected to a three-phase circuit, and with a secondary z-phase bar winding, arranged in z slots of a transformer magnetic conductor closed at one side with an end ring. The drive part of the unit comprises an induction motor with a short-circuited rotor and stator with a bar winding, electrically connected with the secondary winding of the transformer, and at the other side closed with the end ring. The bars of the secondary winding of the transformer are connected with Z bars-feedthrough plates arranged in a tight partition. Each bar-feedthrough plate at the other side is electrically connected with n bars of the stator winding via intermediate electric wire arched segments adjoining the stator (where n=1, 2, … - multiple number between the bars of the stator winding and the secondary winding of the transformer).

EFFECT: expanded area of application and increased energy characteristics and reliability of a drive-transformer unit.

2 dwg

 

The invention relates to the field of special electrical machines, namely, to design asynchronous electric sealed engines used in industrial plants to operate in a chemically aggressive, radiation and explosive gaseous and liquid environments, at high pressures and temperatures.

Known for asynchronous motors for devices operating in an airtight objects or aggressive media, with the stator being located beyond the object (environment)in which the rotor is spinning, and separated from the rotor sealed partition-screen [1, p.26, Fig.5]. Motor [1], contains installed in the housing, the stator and the rotor located in the cavities separated by a sealed partition. Sealed wall-the screen is made in the form of a continuous, thin-walled cylindrical sleeve located between the stator and the rotor.

The drawbacks of such motors are low power characteristics due to the increased thickness of the liner gap between the stator and the rotor. In addition, some of the energy of the electromagnetic field is not transmitted to the rotor, and is allocated in the form of heat from eddy currents induced in the screen while crossing his main magnetic flux. Other disadvantages are complex systems unloading of thin-walled sleeve from axial-radial the effort in sealed object and difficulty of heat dissipation from the rotor, located in a sealed cavity and covered the main source of heat.

Also known asynchronous motors for devices operating in an airtight objects or aggressive environments [2]. The electric motor for sealed objects described in [2] and adopted as a prototype, is, as said in the description, motor-transformer unit including motor and transformer device. The unit contains a motor with a stator and a rotor located inside the sealed object, separated from the transformer wall and transformer-voltage Converter and the number of phases with a rotating magnetic field, performed with the primary winding connected to a three-phase network and the secondary z-phase core winding, located in z the slots of the magnetic core of the transformer, closed with one hand short ring, and on the other, connected with Z terminals of the stator winding.

A disadvantage of this device is a significant departure and the amount of copper windshields parts of the primary distributed winding of the transformer with a large number of grooves per pole and phase (more than two). This accordingly leads to an increase in the length of the connecting rods between the secondary winding of the transformer and the stator winding of motor cha the tee Assembly, thus, reducing its energy performance. In addition, when a large number of connecting rods, is complicated by their tight installation in the partition and reduces the reliability of the unit.

The task of the invention is to expand the scope and improve energy performance and reliability of the motor-transformer unit.

The problem is solved due to the fact that motor-transformer unit includes a motor and a transformer device. Transformer Assembly part made with the primary winding connected to a three-phase network and the secondary z-phase core winding, located in z the slots of the magnetic core of the transformer, closed with one hand short ring.

The motor part of the unit contains asynchronous motor with squirrel-cage rotor and a stator with a core winding is electrically connected with the second core winding of the transformer, and on the other side of the closed short ring.

In contrast to the known technical solutions of the motor is located inside the sealed object, separated from the transformer by a partition, and the terminals of the transformer are connected with Z terminals-inputs located in the partition, each with Ergen-hermetical input from the other side electrically connected to the n terminals of the stator winding through an intermediate electrically conductive arcuate segments, adjacent to the stator (where n=1, 2, ... times the number between the terminals of the stator winding and the secondary winding of the transformer). The electrical connection of each terminal of the secondary winding of the transformer with n terminals of the stator winding is made in the motor part of the unit.

The performance of motor-transformer unit in accordance with the above basic characteristics expands the possible applications, but also improves energy performance and reliability by reducing the length of the connecting rods between the secondary winding of the transformer and the stator winding motor of the unit, thereby improving its energy performance. In addition, with a smaller n times the number of connecting rods, simplified their tight installation in the partition and increases reliability of the Assembly.

Signs relating to the performance of the magnetic circuit of the transformer is cylindrical, and the stator and rotor of the motor - drive, develop common signs and are therefore private.

The invention is illustrated by drawings. 1 shows a longitudinal section of a motor-transformer unit. Figure 2 - cross section a-a motor with a stator disk. Figure 3 is a detailed circular cross-section B-B along the axes of the rod-inputs. Figure 4 - scan active p the surfaces of the transformer and the stator side rods (figure 4, a); the distribution of the magnetomotive forces (MMF) by the average diameter of the transformer and the motor from the currents in the core windings of the transformer (figure 4, b) and stator (figure 4, C), respectively.

Motor-transformer unit contains a transformer device 1 and the motor control device 2. The transformer 1 is made with the primary distributed winding 3 connected to three-phase AC power and a secondary z-phase core coil 4 located at z grooves 5 of the magnetic circuit 6 of the transformer 1, the Terminals 4 of the secondary winding of the transformer 1 are closed with one hand short ring 7. Induction motor 2 is made with squirrel-cage rotor 8 and the stator 9 with the core winding 10, which is located in the slots of the core 11. The rods 10 of the stator winding 9 on the one hand electrically connected through terminals-inputs 12 from the secondary core winding 4 of the transformer 1, and on the other hand short-circuited ring 13. The motor 2 that is located inside the sealed object, separated from the transformer 1 by a partition 14. Each of the Z rods-inputs 12, located in the partition 14, is electrically connected to the n terminals 10 of the stator winding 9 through an intermediate electrically conductive arcuate segments 16 (where n=1, 2, ... times the number between the terminals of the stator winding and arinami secondary winding of the transformer). The electrical connection of each terminal of the secondary winding of the transformer 4 with n terminals 10 of the stator winding through the arcuate segments 16 in the motor part of the unit. The partition wall 14 may be part of a flange of the body of the motor, hermetically closing the hatch in the hull sealed object (not shown), or may be a part of the body sealed object.

Motor-transformer unit (DTA) works as follows.

When connecting the primary three-phase distributed winding 3 of the transformer 1 with p pairs of poles of the three-phase network with a frequency of f arise flowing currents, which create a rotating magnetic field with a frequency of rotation n1=60f/p. This field, crossing the rods 4 secondary Z-phase winding of the transformer (Z is the number of cores) induce in them an electromotive force (EMF). In the Z-phase core winding 4 of the transformer 1 is electrically connected through terminals-inputs 12 and arcuate segments 16 nZ-phase core winding 10 of the stator 9 currents, creating a stepped curve magnetomotive force (MMF) FT(see figure 4, b). The first harmonic of the MDS rotates with the same frequency as the rotating magnetic field of the transformer. Z-phase currents of the secondary core winding 4 of the transformer 1 with arcuate segments 16 are separated at the input of the sty what Neveu winding 10 of the stator 9 to nZ-phase currents (n=1, 2, ...), keeping the same number of poles 2p. nZ-phase currents flowing through the terminals 10, forms a stepped curve magnetomotive force (MMF) FS(see figure 4,) and creates in the working gap between the stator 9 and a squirrel-cage rotor (KS-rotor 8 rotating magnetic field with the same number of poles 2p and with the same frequency of rotation n1that field of the transformer 1. This field passing through the rotor 8, suggests in his squirrel-cage winding EMF that causes the flow in this winding currents and creates electromagnetic torque, which drives the rotor in rotation, just like a standard asynchronous motor with short-circuit the rotor.

The above design is essentially the aggregate of the two electrical machines (a type of machine-transformer units, considered in [3]), electrically connected core windings 4 and 10 sealed and separated by a partition 14. One electric machine (on the left side of the baffle 14) is a step-down transformer 1 with a rotating magnetic field and the Converter of the number of phases of the m1=3 for three-phase distributed winding stator 3, connected to a three-phase network, the number of phases m2=Z for the secondary main winding 4 of the transformer. The secondary winding of the transformer forms a Z-phase radial star electrically closed ring 7. W heaven electric machine (on the right side of the baffle 14) is an asynchronous motor with a conventional squirrel-cage rotor 8 and the stator 9 with nZ-phase core excitation winding, electrically closed ring 9 and is connected to the secondary winding of the transformer 4 through the electric terminals-inputs 12 and arcuate segments 16.

Motor part DTA made with low-voltage core stator winding 9 without insulation coating rods 10 (similar to a squirrel-cage winding of the rotor of a conventional induction motor). This gives you the opportunity to upgrade to one of the fill factor of the slots provodnikovym material and to minimize the length of the frontal parts of the windings, thereby to increase energy performance in the motor part of the unit. Phase voltage supplied to the core winding 10 of the stator does not exceed 2-3 volts. This design of the engine allows it to be used in explosive or flammable environments and at high ambient temperatures (up to 500-600°) and strong radiation radiation (for example, the drive mechanisms in the area of nuclear reactor power plants).

In this design DTA solved the problem of improving the harmonic content of MDS nZ-pivotal phase winding of the stator (see Fig 4) compared with MDS secondary Z-phase core transformer winding (Fig 4, b) reduced n times the number of sealed bushings 12 in the motor part of the DTA.

In this case, the primary winding of transformer frequent the DTA can be used with a minimum number of slots per pole and phase q=1. This simplifies the laying of the coils and reduces the length of the flight and the intensity windshields parts of the primary winding of the transformer that provides minimum weight and dimensions of the unit.

Disk execution of the stator and rotor of the motor part of the DTA provides a small axial length is often a necessary requirement for engines sealed objects, working in extreme environmental conditions, and also provides structural plasticity at the junction of the working bodies of the drive.

Sources of information

1. Wisniewski N.E., Guchanov N.P., Kovalev I.S. Machines and apparatus with sealed drive. Leningrad: Mashinostroenie, 1977.

2. Fence I.G., Vildanov CA and other Motor for sealed objects. RF patent №2173926. Publ. 20.09.2001. Bull. No. 26.

3. Sveceny D.V., Fence I.G. Machine-transformer Assembly // Electrical engineering. 1998. No. 9. P.1-8.

1. Motor-transformer unit including motor and transformer device containing a transformer made with the primary winding connected to a three-phase network, and the secondary z-phase core winding, located in z the slots of the magnetic core of the transformer, closed with one hand short ring, and asynchronous motor with squirrel-cage rotor and a stator with sterzhneva the winding, electrically connected with the second core winding of the transformer, and on the other hand short ring, characterized in that the electric motor is located inside the sealed object, separated from the transformer by a partition, and the terminals of the secondary winding of the transformer is connected with Z terminals-inputs located in the partition, each rod-hermetical input from the other side electrically connected to the n terminals of the stator winding through an intermediate electrically conductive arcuate segments adjacent to the stator (where n=1, 2,... times the number between the terminals of the stator winding and the secondary winding of the transformer), while the electrical connection of each terminal of the secondary transformer with n terminals of the stator winding is made in the motor part of the unit.

2. The Assembly according to claim 1, characterized in that the magnetic core of the transformer is made cylindrical, and the stator and the rotor disc.



 

Same patents:

FIELD: electricity.

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10 cl, 2 dwg

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FIELD: electricity.

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EFFECT: increased torque and reduction of its pulsations, reduced losses of power in electric machine by development of magnetic flow by stator, acting at all poles of rotor with forces of one direction and having one fixed number of poles, equal to number of rotor poles.

3 cl, 4 dwg

FIELD: electricity.

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EFFECT: simplified assembly of direct drive for powerful drives on driving plant, when there is no necessity to provide insulations on winding of this drive stator.

5 cl, 3 dwg

FIELD: electrical engineering.

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18 cl, 16 dwg

FIELD: electricity.

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21 cl, 19 dwg

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FIELD: electrical engineering.

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4 cl, 4 dwg

FIELD: electricity.

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2 cl, 1 dwg

FIELD: electricity.

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EFFECT: improved design of cascade electric actuator due to operation improvement of system of electromagnetic clutches and power supply system of one of asynchronous motors, which provides obtaining of high rotation speeds close to double nominal, at nominal value of moment or obtaining of double moment at nominal rotation speed.

3 cl, 1 dwg

FIELD: electricity.

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EFFECT: prevention of oscillating loads, and also reduction of electromagnet and mechanical losses at start and in the mode of load overcoming.

1 dwg

FIELD: electricity.

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2 cl, 6 dwg

Induction generator // 2255409

FIELD: electrical engineering; specific electrical machines for off-line power supplies.

SUBSTANCE: proposed self-excited induction generator designed for operation under abnormal environmental conditions and in hermetically sealed power-generating units has squirrel-cage rotor and core-shaped stator with Z teeth whose slots receive stator winding, as well as field capacitors; novelty is that stator winding is made in the form of Z bars closed on one end by means of end ring. Generator also has additional magnetic core with slots receiving three-phase winding and conducting bars connected on one end with Z bars of stator winding and on other end they are closed by means of other end ring to form Z-phase winding.

EFFECT: enhanced reliability, reduced mass and size of induction generator.

5 cl, 3 dwg

The invention relates to the field of electrical engineering, in particular to electrical machines with multiple rotors and stators and the actuator, and may be effectively used in industry, construction, transport and other industries

The invention relates to the field of special electrical machines, in particular to the design of asynchronous electric sealed engines used in industrial plants to operate in a chemically aggressive, radiation and explosive gaseous and liquid environments, at high pressures and temperatures and containing encapsulated stators

FIELD: electrical engineering.

SUBSTANCE: core plates are made in the area of internal diameter with slots concentric in relation to this diameter at least in two rows; at that there are at least two slots in each row and bridges between slots are located in the middle of slots in the next row; at that joining of elements fixing core ends to the shaft is made at radial depth from the first row of concentric slots and joining of axial fixing elements to core ends is spread in radial direction to the shaft not farther then the last row of slots from the shaft.

EFFECT: prevention of impact of unevenly compacted rotor core on the rotor shaft of an electrical machine.

4 cl, 5 dwg

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