A motor control method and control device

Abstract

The invention discloses a motor control method. For overcoming the shortcomings of an existing V / f control method and an existing space vector control method, the solution of the invention is to combine the existing V / f control method to the existing space vector control method, a flux linkage vector command is obtained according to a target flux linkage vector phase angle obtained by combinationof an amplitude of a flux linkage command to motor target running frequency command integration, then a motor is controlled according to a flux linkage vector command and an observation flux linkage vector of a stator to improve load capacity at high speed and low speed, the circumstance that torque is manually adjusted to increase voltage is not required, the dynamic property is good, and the motor can enter a stable state quickly. The invention further discloses a motor control device. Compared with the prior art, the motor control method and device have the advantages that the load capacityat high speed and low speed is improved flexibly, the circumstance that the torque is manually adjusted to increase voltage is not required, the dynamic property is good, and the motor can enter thestable state quickly.

Description

technical field [0001] The invention relates to a motor control method. Background technique [0002] The V / f voltage-frequency ratio control method and the vector control method are more commonly used in the existing inverter-based motor control scheme. In the V / f control method, due to the obvious voltage division of the stator resistance at low speeds, the starting torque at low speeds is insufficient, resulting in weak load capacity. Therefore, voltage compensation is required at low speeds to improve the load capacity at low speeds. In practice, In application, manual torque boost is not easy to set properly. If the torque boost is too large, the motor will run with over-excitation, the output current of the inverter will increase, the motor will heat up, and the efficiency will be low under light load. Unable to start normally. However, the vector control method of the frequency converter uses more motor parameters, is highly sensitive to motor parameters, and has po...

AI Technical Summary

Problems solved by technology

In the V / f control method, due to the obvious voltage division of the stator resistance at low speeds, the starting torque at low speeds is insufficient, resulting in weak load capacity. Therefore, voltage compensation is required at low speeds to improve the load capacity at low speeds. In practice, In application, manual torque boost is not easy to set properly. If the torque boost is too large, the motor will run with over-excitation, the output current of the inverter will increase, the motor will heat up, and the efficiency will be low under light load. unable to start normally

However, the vector control method of the inverter uses more motor parameters, is highly sensitive to motor parameters, and has poor robustness in applications. For applications where it is not easy to identify parameters, the applicability is limited.

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