Asynchronous double-speed motor

FIELD: electricity.

SUBSTANCE: motor consists of body with stator with low and high speed windings mounted in slots, rotor fixed at motor shaft and box of inputs with through joints connected to outputs of specified windings. According to invention winding changeover device is located at motor body; input terminals of the motor should have facilities for connection of feeder current-carrying leads and output terminals of winding changeover device should be connected electrically with through joints connected to outputs of motor windings. Winding changeover device can be located in box of inputs; for this purpose two outputs of this device should be connected through its break-type contacts to outputs of low speed windings of the motor and two outputs through normally open contacts of device should be connected to through joints, which are connected to high speed windings of the motor. Third outputs of low and high speed windings should be interconnected and then connected to the third through joint in box of motor inputs.

EFFECT: simplification of power supply system structure, improvement of control and protection, enhancement of reliability and operation of asynchronous double-speed motors due to their power supply by one cable and due to motor control and protection by one device instead of two devices.

2 cl, 2 dwg

 

The invention relates to electrical engineering, in particular to asynchronous two-speed motors.

Known induction motor, which consists of a casing in which is mounted a stator winding, a rotor mounted on the shaft, and a box of inputs intended for insertion of the cable which is supplied the power supply to the electric motor. In the specified box placed 3 bushing clamp connected with the conclusions of the stator winding, which are attached to conductor wires of the power cable [1].

These motors exhibit this drawback, as the impossibility of changing the speed of rotation of the shaft without changing the frequency of the supply voltage that does not allow you to adjust the speed of the mechanism, which is provided, for example a pipeline, and leads to the increased cost of electricity when the engine is not loaded and does not need all the power of the motor.

Also known two-speed motors, which coincide with the proposed invention for most of the main signs and consist of a housing in which is mounted a stator with windings low and high speed, the rotor is placed on the shaft, and a box of inputs with two cable glands and bushing clamps, each of which is connected with the corresponding output windings of both low and high speeds [2].

This is lektrodvigatelem a number of inherent disadvantages, such as complexity, lack of reliability and system security management and protection, as well as themselves motors. This is because the power of such motors have two cables connected respectively to the windings of the low and high speed, as well as two machine control and protection. In this variation of the characteristics of control devices, in particular, their performance leads to the inclusion of the windings high speed, or when another ragged low speed windings, or to their integration with considerable interval of time after turning off the specified low speed windings. The electric motor and the transmission mechanism, which is given them in the motion, are subjected to significant mechanical and electric shock overload, which leads to a decrease in their reliability. In addition, putting considerable stress on the disabled winding low or high speed and the lack of security features on this accession leads to increased danger of destruction of people by electric current, and in mines with a potentially explosive atmosphere to the possibility of an explosion.

The objective of the proposed invention is to simplify the design of the motor and power system, control and protection, improving the reliability and security of the and operation of two-speed asynchronous motors.

For this purpose, in known two-speed asynchronous electric motor, which consists of a housing, a stator mounted with its grooves windings low and high speed, fixed in the specified casing, a rotor mounted on the motor shaft, and a box of inputs with loop-through terminals connected to the winding findings suggested on the motor housing to position the switching device of windings, cable clamps which attach the wires of the power cable and lead it clamps to connect with these bushing clamps. The design of the proposed motor is also distinguished by the fact that said switching device is mounted in its introductory box, two output which is connected to its normally open contacts connected to the through terminals connected to the winding outputs a low speed, and two outputs connected contact closure device, is connected with the bushing clamps, which are connected with two terminals of the windings high speed, and the third winding findings low and high speed connected with each other and with lock clip is attached to one current-carrying lived power cable, and a switching device designed in a way that is not normal sparking parts. To do this, the power circuit device is performed on vacuum arcs is tted with cameras, the control wires of the power cable directly connected to the coil of the electromagnetic drive device switch.

Listed above are the essential features of the invention, differing from the prototype, the necessary and sufficient in all cases covered by the scope of legal protection of inventions.

Mount the motor housing of the device switching windings enables to realize the power of this motor over a single cable from one device control and protection instead of two and to exclude the supply voltage is disconnected from the power source cable and conclusions off of device management and security, because they are missing.

This greatly simplifies the power supply system, control and protection of the proposed motor and increases the safety of its operation.

To significantly simplify the design of the proposed motor leads floatation device switching windings in his introductory box with the ability to connect two lived power cable directly to the input terminals of the specified device and connecting the terminals of one phase winding low speed and high speed with each other and with common lock clip. For electric motors, which operate in an explosive atmosphere, building products, to the which are normally sparking parts, in the introductory box is prohibited. The proposed embodiment of a device switching the windings can be placed in the introductory box motor without limitation the conditions of its use.

The proposed invention is explained by the drawings, there is shown a two-speed motor with integrated switching device of the windings:

- figure 1 is a side view;

- figure 2 - rear view.

Asynchronous two-speed electric motor consists of a housing 1, a stator 2 with mounted in the grooves of the windings of the low and high speed, fixed in the housing 1, a rotor 3 mounted on the shaft 4, the terminal box 5 with bushing clamps 6, 7 and 8, the device switching windings 9 introductory clips 10 and the lead terminals 11. Box inputs has a cable inlet 12, through which the supply cable 13 is introduced in the introductory box 5.

Asynchronous two-speed motor runs thus.

When voltage is applied to conductor wires of the power cable 13 voltage through the introductory clips 10 and included contacts switching windings 9 is fed through the bushing clamps 6 two-phase winding outputs a low speed motor. The voltage of one phase is served by cable 13 directly at the entrance of the clamp 8, which is connected with the conclusions of the windings of the low and high speed. Consequently the those on the low speed winding is energized and the motor turns on at low speed.

To switch the motor at a high speed from the management apparatus serves the voltage on the coil of an electromagnet drive device switching windings. This device is activated, disables the low speed winding and includes winding a high speed, because it relieves tension with walk-through terminals 6 and delivers it to the bushing clamps 7. Thus, the rotor 4 of the electric motor starts to rotate at high speed.

To move the motor in the low speed mode, you need to remove the voltage from the windings of the electromagnet device switching windings 9 and turn it off.

The combination of on and off of the motor windings in one switching device - device switching windings allows you to almost instantly perform switching of the motor windings while guaranteeing the impossibility of motor operation when the windings of both low and high speed. This dramatically increases the reliability of the motor and mechanism, which provides them in action.

Sources of information

1. USSR author's certificate No. 633115, H02K 9/22. Electric machine. Bull. No. 42, 1978.

2. The catalogue of production of JSC "Donetsk electrotechnical plant". Motors explosion-proof series ADVC 315 M12/4, ADC 355 LA 8/4.

1. Asynchronous is wojskowej motor, which consists of a housing, a stator mounted with its grooves windings low and high speed, fixed in the specified case, the rotor attached to the shaft of the motor and box inputs with loop-through terminals connected with the conclusions of these windings, characterized in that on the specified motor housing set the switching device to its windings, input terminals of which are equipped with devices for the connection of current-carrying conductors of the supplying cable and pin clamps the specified device switching windings electrically connected with the bushing clamps that are attached to the leads of the windings of the motor.

2. Asynchronous two-speed electric motor according to claim 1, characterized in that the switching device of the windings placed in a box inputs, two outputs of this device through its normally closed contacts connected with the conclusions of the low speed winding of the motor, and two output trailing through his contacts connected to the through terminals connected to the winding outputs high speed motor, and a third winding findings of high and low speed are interconnected and attached to the pipe clamp in box inputs of the motor.



 

Same patents:

FIELD: electric engineering.

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FIELD: electric engineering, electro-mechanical industry, possible use for manufacturing explosion-proof electric machines.

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3 dwg

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6 cl, 4 dwg

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9 cl, 13 dwg

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3 cl, 3 dwg

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1 cl, 1 dwg

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4 cl, 6 dwg

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