Permanent magnet synchronous motor manufacturers if you ask how the motor works, you can answer it? In fact, although there is no direct electrical connection between the motor rotor the stator, when the stator winding is energized, there is an electromagnetic connection between the rotor through the air gap, similar to the principle of transformer, the stator magnetic field the rotor magnetic field are coupled to each other, so as to achieve the energy conversion function between electrical energy mechanical energy.

Motor sometimes in use will emit a variety of noise, in fact, the motor noise is mainly air, mechanical, electromagnetic noise three, permanent magnet synchronous motor manufacturers today to analyze how to change the existence of these noises.

1. Reasonable design of motor structure

(1) The correct selection of fan material structure: one-way rotation of high-speed motor, can use a streamlined backward tilt centrifugal fan, the centrifugal fan, with the reverse ring than without the reverse ring noise is low; In addition, the basin fan is less noisy than the knife fan; Aluminum fans are less noisy than nylon fans.

(2) When the motor in use produces "sweep", the air gap can be appropriately increased to reduce the air gap magnetic density. When the motor has a power margin, the rotor circumference can be partially turned to increase the atmospheric gap eliminate the noise caused by high order harmonics, but at the same time, the no-load current is increased the power factor is reduced.

2. Ensure the assembly process is good

(1) high quality bearings. The match between the bearing the shaft the bearing the bearing seat should be appropriate, the temperature time of the bearing hot sleeve should be controlled.

(2) The rotor dynamic balance is good is the main cause of mechanical noise, so it is necessary to improve the rotor dynamic balance test accuracy, minimize the influence of eccentricity, ensure the concentricity of the coupling when the motor is installed.