Permanent Magnet Direct Drive Motor for Mixer – No Gearbox, Direct Drive Solution

The Application of Mixing Equipment In Industry

Stirring can disperse two or more different substances among each other, achieving uniform mixing; It can also accelerate heat and mass transfer processes. In industrial production, stirring operation starts from the chemical industry and is widely used as part of the process, focusing on food, fiber, papermaking, petroleum, water treatment, hydrometallurgy, etc.

Permanent Magnet Direct Drive Motor (PMDD Motor) Working Principle​

The PMDD motor is a high-efficiency drive system that directly couples a permanent magnet synchronous motor (PMSM) with the load, eliminating intermediate transmission components like gearboxes or pulleys. Its core operational principles are as follows:

Magnetic Field Generation​​

◇ Stator

Composed of three-phase windings that generate a rotating magnetic field​when powered by variable-frequency AC.

◇ Rotor

Embedded with high-performance permanent magnets (e.g., NdFeB), creating a fixed magnetic field.

No external excitation or brushes/slip rings (brushless design).

◇ Synchronous Operation​​

Interaction between the stator's rotating field and rotor's permanent magnetic field forces the rotor to rotate at synchronous speed(Slip=0).

Speed is precisely adjusted (0–100% rated speed) via frequency control.

◇ Direct Load Coupling​​

The rotor shaft connects directly to loads (e.g., fan impellers, conveyor drums), bypassing gearboxes/couplings.