Source of torque fluctuations
The motor torque is the strength of the motor's rotation. The torque fluctuation not only causes the motor body to vibrate, but also the components that directly or indirectly contact the motor will vibrate. The main sources of Torque Ripple are: torque current fluctuation, cogging torque, machining process, etc.
Torque fluctuation
High noise
The degree of noise damage depends mainly on the frequency, intensity and exposure time of the noise. Noise not only interferes with people's lives and work, but also causes damage to hearing and even induces a variety of cancer-causing diseases.
The motor is used in many products in daily life, such as fans, air conditioners, ceiling fans, etc. The noise of the fan is large, and the noise of the air conditioner will directly affect the quality of sleep.
Easy to cause system resonance
At the beginning of the 19th century, a team of Napoleon soldiers, under the commander's password, took a mighty, uniform and uniform pace through a bridge in Angers, France. As we walked to the middle of the bridge, the bridge suddenly violently trembled and eventually collapsed, causing many officers and soldiers and citizens to fall into the water to die. After investigation, the chief culprit of this tragedy is the resonance! Because the soldiers of the brigade walked together, the frequency generated coincided with the natural frequency of the bridge, which strengthened the vibration of the bridge. When its amplitude reached the maximum until it exceeded the pressure resistance of the bridge, the bridge broke.
The torque fluctuates periodically. If the generated frequency is consistent with the natural frequency of the system, it will cause resonance. Especially for some products whose outer casing is plastic, the torque fluctuation is very easy to produce resonance phenomenon, such as fan resonance and air conditioning resonance.
Large electromagnetic interference, EMI certification does not pass
One of the sources of torque fluctuation is current fluctuation, and the changing current produces a changing magnetic field. The large current fluctuation causes the radiation to be so large that the conduction and spatial radiation exceed the standard.
Poor machining accuracy: torque fluctuations, resulting in uneven machining, and even lead to fractures and damage of the machined parts.
Accelerate system aging: Torque fluctuations cause periodic wear on the mechanical parts.
Improvement of torque ripple
Improvement of the motor body: the back EMF waveform is designed to be sinusoidal, motor chute design, and minimum cogging torque.
Adopting FOC technology, the torque is controlled smoothly at the moment, the control precision is high, the current sinusoidal changes, and the torque current fluctuation is minimized.
Square wave current waveform
FOC current waveform
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