PMSM Motor for HVLS Ceiling Fan Windmax Power HVLS Ceiling fan uses PMSM motor, below you can see a list of differences between asynchronous motor with gearbox and PMSM motor.    Share Inquire Now Next Product Windmax Power HVLS Ceiling fan uses PMSM motor, below you can see a list of differences between asynchronous motor with gearbox and PMSM motor.      Item Asynchronous Motor with Gearbox PMSM Motor Energy efficiency A magnetic field is generated by an exciting current. This makes excitation loss occur. A magnetic field is generated by a permanent magnet. It avoided excitation loss. Transmission Efficiency There is a power loss when asynchronous motor output power via gearbox, thus transmission efficiency reduces. Permanent Magnet Synchronous motor drives the load directly, no gearbox needed, it increases transmission efficiency. Dynamic Air Volume Under same power, affected by transmission efficiency, output torque of asynchronous motor is small, power is week, and air volume is small. Output of Permanent Magnet Synchronous motor is steady, strong power, and high volume. Noise  Two sources of noise : 1. Noise of excitation. 2.Noise of gearbox. Only noise of motor itself, no noise of excitation, no noise of gearbox. Size Matched gearbox causes a big size of the whole motor. it makes installation difficult and high cost. Small size, easy to ship and install, wide range of application. Maintenance With a 200-300 hours of operation in total or stop for a year, it need to replace gear oil. No maintenance, service life up to 15 years.