How can motor drive systems suppress noise while increasing frequency?
During the operation of the motor, various mechanical noises will be generated. These noises come from the vibration of the motor itself, the mechanical deformation of the motor, electromagnetic oscillation and other factors. Therefore, there are three main directions to suppress motor noise:
1. Motor feedback control system : Circuits and electrical devices in the motor drive system can generate a large amount of interference and noise signals . By optimizing the feedback control system, the electrical and mechanical noise of the motor is reduced to a minimum.
2. Motor appearance structure: The design of motor appearance structure can also affect motor noise. Take some measures to reduce motor noise, such as using vibration-absorbing structures and adding sound insulation pads.
3. Cooling and heat dissipation system: The motor will generate a lot of heat during operation. If there is no suitable cooling and heat dissipation system, it may cause the motor to oscillate at high speed and increase the noise. Therefore, the corresponding cooling system also needs to be designed.
b. Methods to deal with noise
In order to avoid the noise generated in the motor drive system, a series of work needs to be carried out, mainly including the following aspects:
1. Reduce the vibration and noise of the motor: By improving the structure and assembly of the motor, avoid the Abnormal vibration during operation, thereby reducing noise. At the same time, vibration-absorbing materials and sound-insulating pads can be used for noise reduction and vibration isolation.
2. Equipment with noise reduction design: Choosing motors and other equipment with noise reduction design can effectively reduce noise. The materials, design and manufacturing processes used in the manufacturing of these devices are all designed to achieve the expectation of reducing noise levels as much as possible.
3. Optimize the drive circuit design: reduce the noise and vibration of the motor by controlling the drive circuit. In circuit design , try to use as few components as possible with high spectral noise, such as transistors , and select low-noise, high-precision components to reduce electrical noise.
4. Apply a high-efficiency heat dissipation system: During high-speed operation, a large amount of heat will be generated inside the motor. When the heat cannot be effectively dissipated, noise will increase.
C. Common noise suppression solutions
1. Control the harmonic noise of the drive system. In the drive system, especially in the PWM controller , the harmonic noise generated is very obvious, so it needs to be filtered through a filter circuit to reduce the noise.
2. Use angular frequency modulation technology. In the V/F control process of the motor, angular frequency modulation technology can be used, which eliminates low-frequency current harmonics and controls the motor's speed and current, thereby reducing noise.
3. Control the mechanical vibration of the motor. For some motors, the sound generated by mechanical vibration is the main noise source, so the vibration of the motor should be controlled by optimizing the mechanical structure design and vibration control.
4. Use a high-efficiency cooling system. Using a high-efficiency, low-noise motor cooling system can effectively control the temperature of the motor and reduce noise.
d. Conclusion
Noise and vibration in the motor drive system are common problems faced by the electric machinery industry. While increasing the drive frequency, reducing vibration and noise is the goal of continuous improvement of the motor drive system. By optimizing the structure of the motor, improving the drive circuit, applying noise reduction technology and adopting a high-efficiency cooling system, noise and vibration can be effectively reduced. At the same time, the electric machinery industry needs to constantly find new solutions based on customer needs to meet the different noise and vibration requirements of different industries for motor drive systems.
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