Protection device and protection method of permanent magnet motor

The invention provides a protection device and method for a permanent magnet motor, and the device comprises an inverter, a current sensor, an isolation contactor, and a control module, and the method comprises the steps: obtaining the current information of each phase; determining whether the permanent magnet motor has a short-circuit fault based on the current information of each phase; and under the condition of determining that the permanent magnet motor has the short-circuit fault, at least controlling the working states of the inverter and the isolation contactor so as to realize protection of the permanent magnet motor, so that heating expanded damage and influence possibly caused by short circuit of the permanent magnet motor can be avoided. 本申请提供的一种永磁电机的保护装置及保护方法，所述永磁电机的保护装置包括：逆变器、电流传感器、隔离接触器及控制模块，其中，通过获取各相的电流信息；基于各相的电流信息确定永磁电机是否存在短路故障；在确定所述永磁电机存在短路故障的情况下，至少控制逆变器和隔离接触器的工作状态，以实现对所述永磁电机的保护，从而能够避免因永磁电机出现短路可能带来发热扩大化伤害和影响。