Method for eliminating motor phase current temperature drift in real-time way

Abstract

The invention discloses a method for eliminating motor phase current temperature drift in a real-time way. In the method, a current sensor is adopted to acquire motor phase current, and an acquisition signal is processed via a proportion amplification module and a digital signal processing module; when a sampling system is electrified, an initial sampling value of the sampling system is calculated via the digital signal processing module so that motor initial zero offset current is obtained; and with continuous operation of the motor, temperature rises, motor three-phase zero offset current changes, the sampling system acquires motor three-phase current in the real-time way and performs corresponding calculation so that motor phase current secondary zero offset current is obtained, and when the system normally operates, the sampling value is processed and calculated via the proportion amplification module and the digital signal processing module, a DC component caused by temperature drift is eliminated, and practical phase current is obtained. phase current temperature drift can be detected in the real-time way by the method, and temperature drift current in the acquired motor phase current can be eliminated so that an instability phenomenon of the system caused by temperature rise is overcome, stability of the motor control system is guaranteed, and reliable operation of the motor is ensured.

Description

technical field [0001] The invention relates to a method for eliminating temperature drift of motor phase current in real time. Background technique [0002] Based on the gradual popularization of new energy vehicles, people's requirements for the comfort of new energy vehicles are also gradually increasing. Considering the cost issue, the precision of electronic devices selected cannot meet the requirements of relevant performance, and electrical devices may change due to temperature changes. performance parameters; for motor control, accurate current detection is crucial to the closed-loop control of the motor. Due to the temperature rise of the device, there will be a certain offset in the acquisition of the motor phase current. If this offset is not If it is cleared, it will affect the stability of the entire motor control system. The current general practice cannot correct this offset in real time, which will cause the system to be in an unstable operating state in indi...

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Problems solved by technology

[0002] Based on the gradual popularization of new energy vehicles, people's requirements for the comfort of new energy vehicles are also gradually increasing. Considering the cost issue, the precision of electronic devices selected cannot meet the requirements of relevant performance, and electrical devices may change due to temperature changes. performance parameters; for motor control, accurate current detection is crucial to the closed-loop control of the motor. Due to the temperature rise of the device, there will be a certain offset in the acquisition of the motor phase current. If this offset is not If it is cleared, it will affect the stability of the entire motor control system. The current general practice cannot correct this offset in real time, which will cause the system to be in an unstable operating state in individual time periods or the entire time period. Therefore, an online real-time elimination of motor phase It is particularly important to propose the current temperature drift method

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