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What measures can effectively reduce three phase motor noise
source：未知 time：2024-10-02 10:22
As people's living standards improve, motor noise control has become an important bargaining chip for expanding the market, especially for motors running in residential environments, which have more stringent requirements in this regard.
The noise of the motor includes electromagnetic noise, mechanical noise and ventilation noise. The noise of a motor is basically a combination of multiple noises. To achieve the low noise requirements of the motor, a comprehensive analysis of the factors affecting the noise should be conducted and measures should be taken.
The control of the machining accuracy of parts is a relatively effective measure, but it must be guaranteed by good equipment and technology. Such measures can ensure the overall matching effect of motor parts. In addition, the mechanical noise of the motor can be effectively reduced by adopting low-noise bearings; the electromagnetic noise of the motor can be effectively reduced by adjusting the slots of the stator and rotor and adjusting the inclination of the rotor slots. Another is the adjustment of the motor wind path. Many motor manufacturers take measures on the fans and wind shields of the motors to reasonably grasp the relationship between motor noise, temperature rise and efficiency. Objectively speaking, the development needs of motor products continue to put forward new issues for motor manufacturers. Electromagnetic noise of motors Electromagnetic noise is mainly caused by the periodic radial electromagnetic force or unbalanced magnetic pull in the motor, which causes magnetostriction and vibration of the iron core. Electromagnetic noise is also related to the vibration characteristics of the stator and rotor themselves. For example, when the exciting force resonates with the natural frequency, even if the electromagnetic force is very small, it will generate a lot of noise.
Electromagnetic noise can be suppressed from many aspects. For asynchronous motors, the first thing to do is to choose the appropriate number of stator and rotor slots. Generally speaking, when the number of rotor slots is quite different from the number of stator slots, that is, when the so-called far slots are matched, the electromagnetic noise is smaller. For slotted motors, the skewed slots can cause the radial force to produce phase displacement along the motor axis, thereby reducing the axial average radial force and thus reducing the noise. If a double skewed slot structure is used, the noise reduction effect is better. The double skewed slot structure divides the rotor into two sections along the axial direction. The twisting direction of each slot is opposite.
There is also an intermediate ring between the two sections.
In order to reduce the harmonics of the magnetic flux potential, a double-layer short-torque winding can be used. And avoid using fractional slot windings. Sinusoidal windings should be used in single-phase motors. In order to reduce the electromagnetic noise caused by the tooth slot, magnetic slot wedges can be used or the slot width of the stator and rotor can be reduced until closed slots are used. When the three-phase motor is running, the voltage should be kept symmetrical as much as possible, and the single-phase motor should be operated in a rotating magnetic field that is close to a circle. In addition, during the motor manufacturing process, the ellipticity of the inner circle of the stator and the outer circle of the rotor should be reduced and the stator and rotor should be concentric to make the air gap uniform. Reducing the air gap flux density and using a larger air gap can reduce noise. In order to avoid the resonance of the electromagnetic force with the natural frequency of the casing, an appropriate elastic structure can be used.
three phase motor,Flameproof three-phase asynchronous motor-Wolong Nanyang Explosion Protection
The noise of the motor includes electromagnetic noise, mechanical noise and ventilation noise. The noise of a motor is basically a combination of multiple noises. To achieve the low noise requirements of the motor, a comprehensive analysis of the factors affecting the noise should be conducted and measures should be taken.
Electromagnetic noise can be suppressed from many aspects. For asynchronous motors, the first thing to do is to choose the appropriate number of stator and rotor slots. Generally speaking, when the number of rotor slots is quite different from the number of stator slots, that is, when the so-called far slots are matched, the electromagnetic noise is smaller. For slotted motors, the skewed slots can cause the radial force to produce phase displacement along the motor axis, thereby reducing the axial average radial force and thus reducing the noise. If a double skewed slot structure is used, the noise reduction effect is better. The double skewed slot structure divides the rotor into two sections along the axial direction. The twisting direction of each slot is opposite.
There is also an intermediate ring between the two sections.
In order to reduce the harmonics of the magnetic flux potential, a double-layer short-torque winding can be used. And avoid using fractional slot windings. Sinusoidal windings should be used in single-phase motors. In order to reduce the electromagnetic noise caused by the tooth slot, magnetic slot wedges can be used or the slot width of the stator and rotor can be reduced until closed slots are used. When the three-phase motor is running, the voltage should be kept symmetrical as much as possible, and the single-phase motor should be operated in a rotating magnetic field that is close to a circle. In addition, during the motor manufacturing process, the ellipticity of the inner circle of the stator and the outer circle of the rotor should be reduced and the stator and rotor should be concentric to make the air gap uniform. Reducing the air gap flux density and using a larger air gap can reduce noise. In order to avoid the resonance of the electromagnetic force with the natural frequency of the casing, an appropriate elastic structure can be used.
three phase motor,Flameproof three-phase asynchronous motor-Wolong Nanyang Explosion Protection
