SU1337677A2 - Device for determining torque on synchronous electric motor shaft - Google Patents

Abstract

This invention relates to a measurement technique. The purpose of the invention is improving accuracy. When the power source 2 is turned on, the outputs of the discriminator 7 receive signals proportional to the voltage and current, shifted by an angle close to 90 °. At the output of discriminator 7, a signal appears whose constant component V is close to zero. The change in torque on the motor shaft 3 leads to a change in V, which is recorded by the indicator 8. Resistances 4 and 5 ensure the symmetry of the supply currents and voltages 1 {y in the phases of the motor 3.1 Il. RF OO with O5

Description

Ja

 N)

one

The invention relates to a measurement technique, namely, serves to dynamically measure the torque on the synchronous hysteresis motor, and is an improvement of the known device described in the author. No. 1064136.

The aim of the invention is to improve the accuracy.

The drawing shows a block diagram of the device.

A device for determining the torque on the shaft of a synchronous electric motor contains a motor current sensor I, installed in one of the wires of a three-wire line, connecting the power supply 2 with test motor 3, two resistances 4 and 5, through which two other wires of the three-wire line, respectively, are connected to the engine, voltage sensor 6 connected between the wire with the motor current sensor 1 and any of the other wires of the three-wire line, phase discriminator 7, to which one motor current sensor 1 is connected to one input bodies, to the other - the output voltage of the sensor 6, and 8, the time indicator connected to the output of the phase discriminator 7.

The active and reactive components of the resistances 4 and 5 are equal to the corresponding components of the resistance of the engine current sensor 1.

Compiler A.Amakhanov Editor N.Gorvat Tehred L.Oleinik Proofreader L.Pilipenko

Order 4118/36 Edition 776 Subscription

VNIIPI USSR State Committee

for inventions and discoveries 113035, Moscow, Zh-35, Raushsk nab., 4/5

Production and printing company, Uzhgorod, Projecto st., 4

3376772

A device for determining the moment on the shaft of a synchronous motor works as follows.

When the power supply 2 is turned on, the inputs of the phase discounter 7 receive signals proportional to the voltage / At and the current shifted in phase by an angle close to 90. At the output of the phase discriminator 7, a constant V signal appears which is close to zero .

Changes in torque on the shaft of the test motor 3 result in a change in the constant component V, which is recorded with the aid of indicator 8. Resistances 4 and 5 ensure the symmetry of the supply currents and voltages in the phases of the test motor 3.

Claims (1)

Invention Formula A device for determining the torque on the shaft of a synchronous motor according to auth.St. No. 1064136, characterized in that, with the aim For accuracy, the other two wires of the three-wire line are connected to the motor through resistances, the active and reactive components of which are equal to the corresponding components of the current sensor. engine