A permanent magnet synchronous motor with locked rotor and phase loss protection and its protection method

Abstract

The invention discloses a locked-rotor and phase-loss protection permanent magnet synchronous motor and a protection method thereof, and relates to the field of motors. Most of the existing ECM motor control systems use thermal protectors and traditional observers. The use of thermal protectors will increase the cost. Using traditional observers, there are observers under the condition of abnormal motor parameters. timely situation. The controller of the present invention includes a main control unit, a coordinate transformation unit, an SVM modulation inverter unit, a current sampling unit, a current processing unit, a locked-rotor and phase loss protection unit, an alarm shutdown unit, and real-time sampling through the main control unit and the current sampling unit The three-phase current and rotor speed are processed by different unit modules, through the analysis and calculation of the fast and slow methods of the locked-rotor and phase-loss protection unit, in the event of a locked-rotor and phase-loss situation, the alarm shutdown unit is realized. The shutdown alarm can protect the motor from locked-rotor and phase loss in time to improve the safety of the motor.

Description

technical field [0001] The invention relates to the field of motors, in particular to a permanent magnet synchronous motor with locked-rotor and phase-loss protection and a protection method thereof. Background technique [0002] With the continuous improvement of people's living standards, the technical requirements for home appliance ventilation and HVAC products such as air conditioners, such as energy saving, environmental protection, intelligence, and low noise, are becoming increasingly stringent. The industry is highly competitive, and the traditional use of thermal protector devices, It is impossible to effectively and timely protect the motor from locked-rotor and phase loss, and there is a potential fire safety hazard. Therefore, solving the above problems is undoubtedly the key to technology. [0003] In the HVAC industry, the system that realizes the control of brushless DC motor BLDC or permanent magnet synchronous motor PMSM through electronic commutation is ge...

AI Technical Summary

Problems solved by technology

ECM motor control systems are widely used in systems such as ventilation and wall-hung boilers. According to the safety needs of customers at home and abroad, thermal protectors are added, and the use of thermal protectors will increase costs; using traditional observers, there are observers Under the condition of abnormal motor parameters, there is a situation that the protection is not timely

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