1, high efficient planetary geared electric motor wholesale efficiency and temperature rise
Regardless of the form of high efficient planetary geared electric motor wholesale, the inverter will produce different degrees of harmonic voltage and current during operation. Higher harmonics lead to increased copper consumption in the stator, increased copper (aluminum), iron in the rotor, and additional losses in the motor. When a higher harmonic voltage cuts the rotor guide at a larger difference, a larger rotor loss will occur. In addition, increased copper consumption due to skin effects should be considered. These losses will cause the motor to generate additional heat, reduce efficiency, and reduce output power.
2, high efficient planetary geared electric motor wholesale insulation strength problem
Many use PWM control methods. The carrier frequency is about several thousand to ten thousand Hertz, and it is currently a small and medium-sized inverter. This allows the motor stator winding to withstand a higher voltage rise rate, which is equivalent to applying a steep impulse voltage to the motor, so that the turn to turn insulation of the motor is more severe test.
3, the basic requirements of single-phase speed regulating motor inverter working environment
Because the inverter part of the high-voltage inverter adopts high-voltage IGBT and other power devices, its on and off frequency is greater than 100HZ, which is easy to form high-order harmonic current, so that the inverter will generate a certain amount of heat when working. Usually, the top of the inverter cabinet is equipped with exhaust fans to discharge the heat in the cabinet to the room, which makes the indoor ambient temperature continue to rise, and ultimately affects the reliable operation of various devices in the cabinet.
4, single-phase speed motor high voltage power supply system outlet circuit breaker control technology improvement
The high voltage side of the transformer used in the variable frequency speed regulation device should be directly connected with the switchgear in the high voltage system, but the protection range of the switchgear is only the short circuit between the power supply line and the low voltage side of the transformer, and the fault of the inverter should be completed by the detection and protection system of the inverter itself.
5, single-phase speed regulation motor motor characteristic test and technical specification revision
When the general motor uses frequency conversion power supply, the harmonic components of the voltage and current output of the inverter will increase the loss of the motor, reduce the efficiency, and increase the temperature. The loss caused by high order harmonics is mainly manifested as increased copper consumption, iron loss and additional loss of stator rotor. Among them, the rotor consumes the largest amount of copper, because the asynchronous motor always rotates in the state of rotation difference close to 1, so the rotor copper consumption is very large. In ordinary asynchronous motors, in order to improve the starting performance of the motor, the skin effect of the rotor increases the actual impedance, thus increasing the consumption of copper.
6, single-phase speed control motor power cable selection points and laying requirements
Because the connection between the inverter output and the motor is cable connected, and each phase of the line has a capacitor to the ground, the capacitor current on the line is not equal. If the cable connection distance is long, there are high harmonic currents in the line, then once the single-phase grounding occurs, the arc ignited by the fault capacitor current will be extinguished for too long, which will make the cable heat at this end, resulting in trouble-free insulation.
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