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Flux-weakening control method of permanent magnet synchronous motor

A permanent magnet synchronous motor and field weakening control technology, applied in motor generator control, electronic commutation motor control, control system and other directions, can solve the problems of high control cost and poor field weakening control effect, and achieve low control cost , easy to understand, good effect of weak field control

Inactive Publication Date: 2014-11-05
SANHONG HEAVY IND SCI & TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

The existing technology is to use complex algorithm for field weakening control, or use relatively simple voltage feedback for field weakening, the control cost is high, or the effect of field weakening control is not good

Method used

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  • Flux-weakening control method of permanent magnet synchronous motor
  • Flux-weakening control method of permanent magnet synchronous motor
  • Flux-weakening control method of permanent magnet synchronous motor

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Embodiment

[0013] Embodiment: the step of the present invention is exactly as figure 1 The block diagram of the vector control is shown. When the voltage that the inverter can provide is close to the limit, the q-axis current cannot get a quick response, that is, the q-axis current cannot be adjusted, and the q-axis current feedback i sq with the q-axis current given The difference increases rapidly. Using this principle, a field weakening control method is proposed. Such as figure 1 As shown, the rotor position angle θ is obtained by the resolver RDC and its decoding chip, and the motor speed ω is obtained through differentiation r , by the speed loop to the given motor speed ω* r and motor speed ω r PI regulation is controlled by the total current control total current The basic given current of the d-axis is obtained through the maximum torque current ratio MTPA control The stator current i is detected by the current sensor a i b , and then obtain d-axis current feedbac...

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Abstract

The invention belongs to the technical field of vector control of a permanent magnet synchronous motor. Total control current I*s is obtained by adjusting PI (Proportional-Integra) of a given motor rotational speed w*r and a motor rotational speed wr; a basic given current i*sdl of d axis is obtained by control of MTPA (Maximum Torque Per Ampere); current feedback isd and isq of the d axis and q axis are obtained by detection of a current sensor; the given current i*sq of the q axis is equal to square root of the difference of (i*s)2 and (i*sd)2; the given adjustment current DELTAi*sd of the d axis is obtained by passing the current feedback isq of q axis through a flux-weakening control module; the given current i*sd of d axis is equal to the sum of i*sdl and DELTAi*sd; the currents of the d axis and q axis are subjected to decoupling control and voltages u*sd and u*sq are output; and an SVPWM (Space Vector Pulse Width Modulation) inverter is controlled to obtain three-phase alternating current to drive the permanent magnet synchronous motor. Through PI adjustment on the given current i*sq of q axis and the current feedback isq of the q axis, the given adjustment current DELTAi*sd of the d axis is obtained, optimal flux weakening of the permanent magnet synchronous motor is achieved, the flux-weakening control method is easy to understand and implement, control cost is low, and a good flux-weakening control effect is achieved.

Description

technical field [0001] The invention belongs to the technical field of motor vector control, in particular to a field weakening control method of a permanent magnet synchronous motor. Background technique [0002] The permanent magnet synchronous motor has the advantages of high power density, high efficiency and energy saving. The industrial transmission system not only requires a large output torque, but also requires a wide speed range, which requires strong magnetic performance. It is very important to control the permanent magnet synchronous motor. In the prior art, a complex algorithm is used for field weakening control, or a relatively simple voltage feedback is used for field weakening, and the control cost is high, or the field weakening control effect is not good. Contents of the invention [0003] The object of the present invention is to provide a method for controlling the field weakening of a permanent magnet synchronous motor with low control cost and good ...

Claims

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Application Information

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IPC IPC(8): H02P21/00
Inventor 罗庆林
Owner SANHONG HEAVY IND SCI & TECH
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