Energy-Saving Permanent Magnet Synchronous Motor for Water Pumps & Vacuum Systems (300kW-700kW)​

Working Principle of Permanent Magnet Synchronous Motor (PMSM)

The Permanent Magnet Synchronous Motor (PMSM) converts electrical energy into mechanical energy through electromagnetic interaction. Its core working principle is as follows:

Magnetic Field Generation​​

◇ ​​Stator: When three-phase AC current flows through the stator windings, it generates a rotating magnetic field (speed determined by the power supply frequency).

◇ ​​Rotor: Equipped with permanent magnets (e.g., neodymium iron boron), creating a fixed magnetic field.

Synchronous Rotation​​

◇ The stator’s rotating magnetic field "pulls" the rotor’s permanent magnetic field, forcing the rotor to rotate at the same speed (synchronous speed) without slip.

Torque Generation​​

◇ The angle (load angle) between the stator’s magnetic field and the rotor’s permanent magnetic field produces electromagnetic torque, driving the load.

◇ By adjusting the current phase (vector control), torque output efficiency can be optimized.

Key Features

◇ High efficiency (>95%), high power density, low maintenance.

◇ Requires a matched drive controller and cannot start directly from line frequency.