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Open circuit device and method of induction motor

A technology of induction motor and open circuit current, applied in the direction of controlling generators, electrical components, control systems, etc.

Inactive Publication Date: 2017-07-04
CHANGZHOU XINYA ELECTROMOTOR
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

In existing solutions, the duration of the open circuit is based on the setting of the open circuit time. If the speed at which the motor rotates changes, or the mass of the rotor connected to its armature changes, the open circuit time does not stop accurately and resetting occurs.

Method used

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  • Open circuit device and method of induction motor
  • Open circuit device and method of induction motor

Examples

Experimental program
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Embodiment Construction

[0008] figure 1 Shows the R, S, T, N terminals of a three-phase network, and the delta-connected field windings 1, 2, 3 of a squirrel-cage motor. To start the motor, the S end is connected to the N end through the key switch 13 through the key stop switch 14, the key emergency switch 15, the contact 23 of the open circuit current relay 28, and the coil 7 of the running current relay 27, and the working current relay pulls in. Among them, the contact 8 is opened, and the contacts 9, 10, 11 connect the phase voltages from R, S, T to terminals 6, 5, 4 of the field windings 1, 2, 3, and the coil 7 passes through the contacts 14, 12 , 15, 23 get the maintenance current. To open the motor, the maintenance current circuit of the working current relay 27 must be cut off through the button stop switch 14 or the button emergency switch 15, so that the working current relay 27 is released, and the contacts 9, 10, 11, 12 are disconnected to cut off the motor. The working current, then t...

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PUM

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Abstract

The invention discloses an open circuit device and method of an induction motor. A direct current after being rectified is applied onto magnetic field windings of the motor by an AC power supply, an open circuit current is connected, outer ends of two magnetic field windings connected in series are sensed by a voltage and electric energy after a working current is cut off and an armature still rotates dependent on a certain voltage and the electric energy, and in a current-free half period of a half-wave rectification open circuit current, the open circuit current can be maintained by the motor voltage and the electric energy which are obtained from the magnetic field windings until the voltage and the electric energy are reduced to certain predetermined values.

Description

technical field [0001] The invention relates to a device and method for opening an induction motor. Background technique [0002] In the prior art, a direct current is applied to the field winding of an induction motor to solve the problem of an open circuit of the induction motor. In existing solutions, the duration of the open circuit is based on the setting of the open circuit time. If the speed at which the motor rotates changes, or the mass of the rotor connected to its armature changes, the open circuit time does not stop accurately and resetting occurs. . To control the open circuit current applied to the field winding in a squirrel-cage induction motor, the frequency of the voltage induced from the field winding, the induced voltage, or the induced current can be used. Contents of the invention [0003] The present invention is to provide an apparatus and method for controlling the open circuit of an induction motor regardless of changes in the speed of rotation ...

Claims

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Application Information

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IPC IPC(8): H02P9/00
CPCH02P9/008
Inventor 严洋
Owner CHANGZHOU XINYA ELECTROMOTOR