SU723536A1 - Regulator of heating electric machine windings - Google Patents

Description

There is no control over the quality of the setting and practically makes it impossible to visually assess the accuracy of heating control during the operation of the regulator.

The purpose of the invention is to increase accuracy and simplify the controller.

This goal is achieved by the fact that the heating controller for the windings of electric machines contains a stabilized current source and a large-scale converter whose input is connected to the second output of the memory unit and the output to the second input of the comparator unit, the stabilized power source being connected via a third key element with an electric winding cars.

The drawing shows a functional diagram of the regulator of heating of the windings of electric machines.

The controller contains series-connected ambient temperature sensor I, temperature setpoint 2, comparison unit 3 and control unit 4, one of whose outputs is connected to the first input of memory 5 and the other output to the first input of the first key element b and the input of the block 7 interrogation, the output of which is connected to the control inputs of the second and third key elements 8 and 9 and the second input of the key element 6 voltage regulator 10, connected to the voltage source 11 through the winding 12 of the electric machines stabilized source Full current 13 and scale converter 14.

The device works as follows.

When applying voltage from the polling unit 7, a signal is sent to the first key element b, which opens the control circuit of the voltage regulator 10. The latter closes and breaks the current path from the voltage source 11 through the winding 12 of the electric machine. Simultaneously, the polling unit 7 sends a signal to open the second and third key elements 8 and 9, through which a stabilized current source 13 and the input of the large-scale converter 14 are connected to the winding 12 of the electric machine. A full voltage drop is applied to the input of the large-scale converter 14 12. The voltage removed from the output of the scaler 14 and supplied to one of the inputs of block 3 in this case is obviously greater than the voltage that the comparison unit 3 sends to the second input from the reference 2 and a temperature proportional okrzhayuschey temperature environment.

At the output of the comparator unit 3, a signal appears which, through the control unit 4, enters

drive unit 5 memory. The drive turns on and moves the variable resistor slider, inputting resistance into the input circuit of the large-scale converter 14 until the voltage at the output of the latter becomes paBHfcjM voltage supplied to the comparison unit 3 from the setpoint 2 temperature. The equality of the voltages at both the inputs of the comparison unit 3 indicates that the resistor is set to

 the output of the voltage converter 14 is proportional to the ambient temperature. At the same time, the drive moves the engine, changing the setting of the voltage regulator 10 in proportion to the resistance of the winding 12 of the electric machine. With equal voltages at both inputs of comparison unit 3, the signal at its output becomes equal to zero and

0 outputs of the control unit are commanded to turn off the drive of the memory block 5, close the second and third key elements 8 and 9 with a signal from the polling unit 7, connect

5 the control circuit of the voltage regulator 10 to the output of the memory block 5 through the first key element 6 to the adjustment of the setpoint in the temperature setpoint 2. The process of storing the resistance of the winding 12 of the electric machine in a cold state is over.

As a result of the switching, the winding 12 of the electric machine is disconnected from the stabilized current source and the scale generator 14 and connected to the voltage source 11 via the voltage regulator 10, the output voltage of which is proportional to the resistance of the winding 12 of the electric machine. In addition, the setpoint is reconstructed in the temperature setting device 2, and from its output to the comparison unit 3 a voltage is applied that is proportional to the specified heating temperature of the winding 12 of the electric machine. Since the first key element 6 is open, the winding 12 of the electric machine is connected to the voltage source 11, it is heated for the time specified by the polling unit 7, after which it has passed from the unit. 7, a signal is received to close the first key element 6 and open the second and third key elements 8 and 9. The electric motor winding 12 is disconnected from the voltage source 11 and connected to the stabilized current source 13, and the scale converter 14 to the electric winding 12. At the same time, a signal is sent to measure the voltage with a digital voltmeter at the output of the scale converter 14. For ease of reading, the scale of the voltmeter is calibrated in ° C,

As a result of the heating of the winding 12 of the electric machine, the voltage at the output of the large-scale converter 14 will be proportional to its temperature. If this Stress is less than the temperature arriving at block 3 from setpoint 2, there will be no signal at the output of block 3 of the comparison, and after expiration of the measurement determined by the block 7 of the poll, the second and third key elements 8 and 9 again close and the first key element opens b. Heating of the winding 12 of the electric machine continues until the next measurement. The described process continues until the voltage at the output of the large-scale converter 14 becomes equal to or greater than the voltage supplied to the comparison unit 3 from the setpoint 2 of the temperature, which corresponds to the heating of the electric machine winding 12 to the specified temperature or slightly above it. In this case, at the output of the comparison unit 3, a signal appears and opens the first key heating element 6 and, therefore, the winding, 12 electric machines of the stator from the voltage source 11. The winding 12 of the electric machine remains disconnected until the next moment.

Heating continues for the time determined by the impregnation process cycle. If necessary, the setpoint of the setpoint 2 temperature can be changed in accordance with the technological cycle of impregnation from external devices.

The use of a stabilized current source, which provides the dependence of the voltage drop on the heated winding only on the resistance of the winding of an electric machine proportional to the heating temperature, improves the accuracy of device control and allows visual monitoring of the temperature during the heating of the winding. In addition, the accuracy of the adjustment of the device is increased by eliminating the error of the approximation: the logarithmic characteristics of straight segments.

Simplification of the heating controller for the windings of electric machines is provided by using a large-scale converter instead of hardware-complex logarithmic converters. The device can be used in the manufacture of electrical machines of various designs and coils of electrical apparatus with copper and aluminum windings.

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Claims (2)

1. Bolotnikov, AM and others. Regulated power sources for impregnation installations and current drying of stators.-Works VNIIElektroprom, vol. 8, 1969, p. 176-183. 0 2. Authors certificate of the USSR 589626, cl. H 01 B 19/02, 1973 (prototype).