SU936323A1 - Device for regulating and stabilizing induction motor speed - Google Patents

Description

one

The invention relates to electrical engineering, in particular, to devices for regulating and stabilizing the speed of linear asynchronous electric motors, and can be used in various transport installations with a linear asynchronous electric drive. house.

There are known devices for the DLI control and stabilization of the speed of linear asynchronous electric motors, which contain a frequency converter connected to the supply circuit of the inductor winding of the electric motor, the control input of which is connected to the unit for setting and regulating the speed p J.

The drawbacks of the devices are their complexity and low reliability of operation.

The closest in technical essence to the present invention is a device for regulating and stabilizing the speed of a linear induction motor with a three-phase inductor winding containing a thyristor voltage regulator connected to the power supply circuit of the inductor windings, the control input of which is connected to the output of the comparison unit through the speed regulator , the first input of which is connected to the output of the block of the task and speed control 2.

The disadvantage of such a device is low reliability due to the presence in the control unit of the Tachogenerator, which requires the use of additional devices that convert the linear movement under the engine hinge into the rotation angle of the Tachogenerator rotor.

The purpose of the invention is to increase the reliability of the device and simplify its design.

Claims (2)

This goal is achieved by introducing an amplifier into the device, the output ends of which are connected to one of the inputs of the comparison unit, 39 and each phase of the inductor winding has two parallel branches, and the input ends of the amplifier are connected to two zero points formed by the ends of the first and second parallel branches. The drawing shows a device diagram. The device contains a thyristor voltage regulator 1 connected to the power supply circuit of the inductor winding of the electric motor 2, containing two parallel branches 3 and i in each phase. The ends of the parallel branches 3 and k are combined into nodes, forming two zero points 5 and 6, which are measuring terminals in the circuit. The control input of the thyristor voltage regulator 1 is connected via the speed controller 7 with the output of the comparison unit 8, the first input 9 of which is connected to the output of the reference and speed control unit 10. The second input 1.1 of Comparison unit 8 is connected to the output of amplifier 12, the first input 13 of which is connected to the first zero point 5 of the inductor winding of the electric motor 2, and the second input H of the amplifier 12 is connected to the second zero point 6 of the electric motor inductor winding 2. The parallel winding branches are spatially separated from the center of the inductor so that the zero point of one parallel branch is located under the oncoming edge of the inductor, and the second zero point is under the escaping edge of the inductor. When a secondary element enters the inductor due to the development of a longitudinal edge effect, the parallel winding branches are in different magnetic conditions, as a result of which different EMFs are induced in them, which leads to the presence of a potential difference between zero points. The potential difference depends on the speed of movement of the secondary element of the engine. The higher the speed, the greater the potential difference. The device operates as follows: According to the actual speed of the linear motor 2, a voltage is applied to the coil of the inductor of the motor 2, the value of which is determined by the voltage of the output of the reference and control unit 10 speed. When the speed of the linear motor 2 decreases (increases), due to, for example, an increase in 34 (decreases) static load, the potential difference between zero points 5 and 6 of the inductor winding of the electric unit 2 decreases (increases), which leads to a decrease (increase) in the output amplifier 12, an increase (decrease) in the voltage at the output of the comparator unit 8, and accordingly, an increase (decrease) in the voltage applied to the inductor winding of the electric motor 2, and consequently, increase the speed (decrease) up to a given value within the statism of the system. Speed control is carried out by changing the voltage value supplied to input 9 of the comparison unit 8 from the output of the reference unit and adjusting the 10 SPEED. Thus, in this device, the stabilization and regulation of the speed of a linear asynchronous electric motor is performed without the use of a tachogenerator, which simplifies the device and increases the reliability of its operation. The invention of the device for controlling and stabilizing the speed of a linear induction motor with a three-phase inductor winding, contains a thyristor voltage regulator connected to the inductor windings supply circuit, the control input of which is connected to the output of the reference unit through the speed regulator and speed control, characterized in that, in order to increase the reliability of the device and simplify its design, an amplifier is inserted into it, the output ends of which are Connected to one of the inputs of the comparison unit, and each phase of the inductor winding has two parallel branches, and the input ends of the amplifier are connected to two zero points formed by the ends of the first and second parallel branches. Sources of information taken into account in the examination 1.Dega Riga meeting on magnetic hydrodynamics. Part 2, MHD-ma tires. Riga, 1978, p. J2. 2, Prospects for the application of linear electric motors on new types of transport. Ed. G.I.Izhel. Kiez. 1979, pp. 160-164.