Permanent magnet synchronous motor dragging device transformed from induction motor

Abstract

The invention relates to a permanent magnet synchronous motor dragging device transformed from an induction motor. The device comprises: a variable frequency driver used for adjusting the frequency of an induction motor and driving a permanent magnet synchronous motor; a conducting wire device provided with a regulating valve and N conducting wires, wherein the regulating valve is arranged outside the conducting wire device, the conducting wire connected with a rotor is thickened by rotating the regulating valve clockwise, and the conducting wire connected with the rotor is thinned by rotating the regulating valve anticlockwise; the permanent magnet synchronous motor, wherein the rotor is arranged in the permanent magnet synchronous motor, and the permanent magnet synchronous motor is used for adjusting the resonant frequency generated by the permanent magnet synchronous motor through power adjustment; a voltage detector used for detecting the voltage of the variable frequency driver; a capacitance detector used for detecting the capacitance of the permanent magnet synchronous motor; and a control unit used for controlling the frequency adjustment process when the induction motor is transformed. According to the invention, the carrier frequency generated by the variable frequency driver is far away from the resonant frequency generated by the permanent magnet synchronous motor, so that the dependence of the whole system on devices is reduced, and the stability of the whole system is remarkably 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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