SU613450A1 - Device for checking asymmetry of location of electric machine magnetic circuit teeth - Google Patents

Description

device for control of the tested magnetic circuit, for example, a rotor.

The device contains a sensing element 1 with an excitation winding 2 and counter-connected signal windings 3, laid in the groove 4; a rotary transformer 5 with the number of poles, a multiple of the number of grooves of the tested magnetic circuit 6, with an excitation winding 7 and an output winding 8; an executive motor 9 with excitation windings 10 and control AND, an amplifier 12, a multivibrator 13, a relay 14 having normally closed 15 and normally open contacts 16; recording device 17.

The tested magnetic circuit 6 adjoins the sensing element 1, is mounted on the same shaft with the rotating transformer 5 and is kinematically connected with the executive motor 9. The signal windings 3 of the sensing element 1 are connected to the input of the amplifier 12. The output of the amplifier 12 is through the normally closed contacts 15 of the relay 14 is connected with the control winding 11 of the executive motor 9, and the normally open contacts 16 of the relay 14 are connected to the AC network. The winding of the relay 14 is connected to the output of the multivibrator 13. The output winding 8 of the rotating transformer 5 is connected to the recording device 17.

The device works as follows.

When an alternating current is applied to the excitation winding 2 of the sensing element 1, a magnetic flux occurs in it, which closes along the tested magnetic conductor 6 and induces an emf in the signal windings 3. This PDA is fed through the amplifier 12 and the normally closed contacts 15 of the relay 14 to the control winding 11 an executive motor 9, the excitation winding 10 of which is connected via a capacitor to an alternating current source. As a result, the motor 9 will rotate the tested magnetic circuit 6 and the rotor of the rotating transformer 5 until the emf on the signal windings 3 becomes minimal. This position corresponds to the coincidence of the axes PA. 4 sensitive elements 1 and one of the slots of the tested magnetic circuit 6, and is taken as the initial one.

Next, a multivibrator 13 is turned on, which supplies a voltage pulse to the relay coil 14. The normally open contacts 16 of the relay 14 are closed, and the control winding 11 of the motor 9 is supplied with voltage from an alternating current network. The motor 9 begins to rotate and dislodges the inspected magnetic circuit 6 from the initial position.

The multivibrator 13 is adjusted so that the time during which the voltage is not supplied to the relay 14 is sufficient to take readings from the recording device 17, and the time during which the voltage is applied to the relay 14, ensures the rotation of the magnetic circuit 6 to the position in which its second groove will be located approximately opposite the groove 4 of the sensing element 1. When the multivibrator 13 is turned off, the relay coil 14 is de-energized, the relay contacts return to their original position and to the control winding And the motor ate 9 again supplied voltage from the signal windings 3 sensing element 1. As a result, the engine 9 establishes the magnetic circuit 6 checks emy a new

the position in which the axis of its second groove coincides with the axis of the groove 4 of the sensitive element 1.

The rotor of the rotating transformer 5 is also installed by the tracking system in

The new position and the operator reads the reading from the registering device 17. Then the multivibrator 13 is turned on again, the tested magnetic circuit 6 together with the rotor of the rotating transformer 5 is alternately set to the coincidence position of the axes of the slots of the magnetic circuit 6 with the axis of the groove 4 of the sensitive element 1. At each position reading device 17, which is proportional to asymmetry

the arrangement of the teeth of the tested magnetic circuit 6, since the number of poles of the rotating transformer is 5 times the number of teeth of the magnetic circuit 6 and therefore in each next stable position of the following system

The voltage on the output winding 8 of the rotating transformer 5 corresponds to the deviation from its next zero point (the rotating transformer 5 is selected with small errors compared to measured values of the asymmetry of the teeth of the tested magnetic circuit 6).

Thus, the invention allows to automatically control the asymmetry of the arrangement of the teeth of the magnetic circuits of electrical masks, which improves the performance of control operations and the accuracy of control.

Claims (1)

Invention Formula A device for controlling the asymmetry of the arrangement of the teeth of an electric conductor's magnetic circuit, which contains a driver, a recording device, a reading device, and a sensing element, provided with counter-connected signal windings and a shaft, designed to install a tested magnetic wire and a reading device, in order to accelerate control process and increase its accuracy; the driver is made in the form of a tracking system equipped with an amplifier, a multivibrator, a relay with a winding and normally closed and normally open contacts, an executive motor with a control winding kinematically connected with the sensor element shaft, and the reading device is made in the form of a rotating transformer with a multiple of poles the number of grooves of the tested magnetic circuit, moreover, the multivibrator is connected to the relay winding, the normally closed contacts of which are included in the price connecting the amplifier and the motor control winding are normal The open contacts are connected to the AC network, and the output winding of the rotating transformer is connected to the recording device. 17