An induction motor modified permanent magnet synchronous motor drive device

Abstract

The invention relates to a drive device for transforming an induction motor into a permanent magnet synchronous motor, comprising: a variable frequency driver, used to adjust the frequency of the induction motor and drive the permanent magnet synchronous motor; a wire device, which is provided with a regulating valve and N wires, The regulating valve is set outside the wire device. Rotating the regulating valve clockwise makes the wire connected to the rotor thicker, and turning the regulating valve counterclockwise makes the wire connected to the rotor thinner; the permanent magnet synchronous motor is equipped with a rotor inside to pass Power adjustment to adjust the resonant frequency generated by the permanent magnet synchronous motor; voltage detector, used to detect the voltage of the variable frequency drive; capacitance detector, used to detect the capacitance of the permanent magnet synchronous motor; control unit, used to control the transformation of the induction motor The frequency adjustment process at the time; thus, by keeping the carrier frequency generated by the variable frequency drive away from the resonant frequency generated by the permanent magnet synchronous motor, the dependence of the overall system on the device is reduced, and the stability of the overall system is significantly improved.

Description

technical field [0001] The invention relates to the technical field of pumping unit drives, in particular to a drive device for transforming an induction motor into a permanent magnet synchronous motor. Background technique [0002] In oil field production operations, traditional asynchronous motors and other types of pumping device drive motors have disadvantages such as complex mechanical structure, large motor size, low material utilization rate, and low overall system efficiency. Especially for different oil wells and different working intervals, the well conditions are often inconsistent, and the traditional drive method cannot adjust the high-precision speed of the drive motor, and can only rely on the continuous replacement of pulleys of different sizes to change the transmission ratio and speed regulation. This method greatly increases manpower. , It also affects the stability of oil recovery in the oil field, which is not conducive to the demand for long-term and au...

AI Technical Summary

Problems solved by technology

[0005] For this reason, the present invention provides a kind of induction motor transformation permanent magnet synchronous motor driving device, can effectively solve the carrier frequency that the frequency conversion driver produces and the permanent magnet synchronous motor produce when the induction motor transforms the permanent magnet synchronous motor driving device in the prior art The technical problem that the resonance frequency is the same or close so that the stability of the overall system is low

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