Motor control method using space vector pulse width modulation and controller thereof

Abstract

The invention discloses a motor control method using space vector pulse width modulation and a controller thereof. The method comprises the steps that an output signal of a current detecting module connected in series with a lower bridge arm electronic switch of an inverse bridge is collected when the inverse bridge is in a V0 state; beginning time sampled by a triggering current is controlled tocause the sampling process to be in the V0 period and cause the sampled current signals Ia and Ib to be in positive proportion to a motor phase current when V0 voltage vector time t0out for outputtinga space vector PWM signal is more than the minimum value t0min of the V0 voltage vector time; the V7 time t7out is controlled to be less than V0 time t0out when the V0 time is less than t0min duringthe partial modulation to compensate the V0 time so that the V7 time t7out is more than t0min, and the effective voltage vector time t1out and the effective voltage vector time t2out are relatively prolonged so as to improve the motor acceleration and the highest speed. The motor controller using the method has lower current detection hardware cost, can stabilize the phase current of the detectingmotor and simultaneously reduce or eliminate the influence on the motor acceleration and the highest speed due to current sampling as much as possible.

Description

technical field [0001] The invention relates to a motor control method and a controller thereof, in particular to a control method and a controller thereof for sampling a current signal of a lower bridge arm of an inverter bridge to generate a space vector pulse width modulation signal to drive a motor. Background technique [0002] In motor control technology, a common motor controller includes an isolated current detection module, a core control module and an inverter bridge. [0003] The isolated current detection module is installed at the phase line of the motor, which converts the phase current signal of the motor into a proportional signal output by means of isolation; for example, a Hall current sensor. [0004] The core control module accepts the current signal of the current detection module and outputs the space vector pulse width modulation signal to the electronic switch of the inverter bridge to control the operation of the motor; for example, the C2000 series ...

AI Technical Summary

Problems solved by technology

The problem with this method is that the current detection module of the lower arm of the inverter bridge collects the current value of the corresponding lower arm, while the space vector algorithm needs to collect the phase current of the motor; and the current sampling also takes time, so the state of V0 needs to be controlled The shortest time, and choose the appropriate sampling trigger time

In a PWM cycle, the increase of V0 voltage vector time will relatively shorten the V1', V2' voltage vector time, thereby reducing the maximum speed and acceleration of the motor

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