To solve the electromagnetic interference (EMI) problem caused by permanent magnet synchronous motors (PMSM), a series of measures need to be taken. These include motor design, power electronics and control system design, and additional EMI suppression measures. Here are some possible solutions:
Optimize motor design: By improving the motor design, electromagnetic interference from PMSM can be reduced. This includes optimizing the magnetic field distribution in the stator and rotor, improving the winding design, and optimizing the shape and position of the magnets.
Use appropriate filters: Conducted electromagnetic interference can be reduced by using a filter between the power line and the motor or at the controller output. For PMSM applications, custom filters may be required to meet specific EMI requirements.
Grounding and Shielding: You can reduce electromagnetic radiation by grounding the motor and controller housing. In addition, the use of metal-shielded cables can reduce the spread of radiated interference.
Choose appropriate cables and connectors: Using cables and connectors with appropriate shielding and grounding can reduce the spread of electromagnetic interference.
Use appropriate control system algorithms: By optimizing control algorithms and parameters, the electromagnetic interference of PMSM can be reduced. For example, EMI can be reduced by optimizing parameters such as PWM frequency, dead time, or voltage slope.
Use soft start and slow stop: By using soft start and slow stop technology when starting and stopping the motor, electromagnetic interference to the power grid and surrounding equipment can be reduced.
Follow good EMI practices: for example, ensure good grounding between the motor driver and the motor, keep the shielding of the controller and power lines intact, and use appropriate cable bundles and conduits where possible. Organize cables.