Advantages of variable frequency motor insulation system
Variable frequency motor adopts the AC speed regulation mode of "special frequency conversion induction motor + frequency converter", which is guided by its excellent performance and economy in the field of speed regulation, replacing the traditional speed control mode. It brought good news to all walks of life lies in: the machinery automation and high production efficiency, saving energy, improving product qualification rate and capacity of product quality, the corresponding power system, improve equipment miniaturization, increase comfort, is to quickly replace the traditional mechanical speed and DC speed control scheme. Below we together to understand the frequency conversion motor insulation system advantages.
For variable frequency motor, the input voltage and current are no longer sinusoidal waves with constant frequency, but are supplied in nonsinusoidal form. In addition to the fundamental voltage, there are many harmonic components in the voltage, and there are also side frequency components. The inter turn and main insulation are frequently affected by impulse voltage, and the main insulation and inter turn insulation of the motor must be strengthened. Therefore, strengthening the stator turn to turn insulation is one of the keys.
Another key is to reduce the air gap inside the winding. Because the air gap can cause partial discharge, the electrical performance of the winding will decrease, and the winding life will be reduced. Therefore, the key to the safe operation of variable frequency speed regulating motor is the selection of insulation materials and the design of insulation structure, while the choice of insulation material focuses on the selection of winding wires and the selection of impregnating resin. The key of the insulation structure is the rationality of the structure and the implementation of the process. The characteristic of frequency conversion motor insulation system lies in the two key points of its electronic quantitative interturn and winding air gap. The reasonable implementation is the key point of improving the performance of the inverter motor.