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Permanent magnet synchronous motor is an efficient and energy-saving type of motor, and its control strategies usually include the following:

1. Vector Control: Vector control is one of the most commonly used control strategies for permanent magnet synchronous motors. By measuring the position and speed of the motor rotor, using magnetic field orientation control and current control, precise control of the motor is achieved, improving efficiency and performance.

2. Direct Torque Control (DTC) is a sensorless control strategy that enables fast response and precise control of motor torque and speed, making it suitable for applications that require high dynamic performance.

3. Indirect Field Oriented Control (IFOC) is a variant of direct control technology, which is based on the equivalent circuit model of an induction motor and estimates the rotor position and speed through observers, achieving control of a permanent magnet synchronous motor.

4. Field Oriented Control (FOC) is a current control method that converts the motor space vector into a constant frequency and amplitude AC voltage signal to achieve precise control of permanent magnet synchronous motors.

5. Maximum Torque Control, MTC: The MTC control strategy aims to maximize the output torque of the motor, stabilize the output power of the motor within a certain range, and improve the efficiency and performance of the motor.

The above are common control strategies for permanent magnet synchronous motors, and different application scenarios and requirements may choose different control methods to achieve effective control and optimized operation of the motor.