At present, many small and medium-sized inverters use PWM control. His carrier frequency is about several thousand to ten kilohertz, which makes the stator winding of the motor to withstand a high voltage rise rate, which is equivalent to applying a ...
When the ordinary asynchronous motor is powered by the inverter, the vibration and noise caused by electromagnetic, mechanical, ventilation and other factors will become more complicated. Each time harmonic contained in the variable frequency power s...
1, electromagnetic design For ordinary asynchronous motors, the main performance parameters considered during redesign are overload capability, startup performance, efficiency, and power factor. The variable frequency motor, because the critical slip...
When designing the structure again, it is mainly considering the influence of the non-sinusoidal power supply characteristics on the insulation structure, vibration and noise cooling mode of the variable frequency motor. Generally pay attention to th...
Introduction: When the variable frequency speed regulating motor is in normal operation, the following sparks and normal phenomena appear under the brush, which is a harmless normal spark: the DC geared motor is based on the ordinary DC motor, and is...
Introduction: At the beginning of the motor drying process, as the moisture is evaporated by heat, the insulation resistance is lower, then gradually increases, the rising resistance becomes slower and slower, and finally stabilizes at a certain valu...
The DC geared motor is made on the basis of ordinary DC motor, plus the matching gear reducer. Let's take a look at the reasons why the brush of the DC gear motor is too large: 1. Cause of failure: The brush of the wound-type motor is not smooth due ...
There are two main reasons why the motor produces abnormal vibration and abnormal sound. Mechanical reasons: 1. There are debris in the motor; 2, poor bearing lubrication, bearing wear: long-term use of the motor due to the lack of lubricating oil in...
