Wuxi Lanhai Electric Motor Co.,Ltd
Add: 4#, Tianshi Road Shitangwan Town, Wuxi, Jiangsu, China
Brief Introduction to Motor
The Motor industry in China has experienced a cognitive stage, assembly stage and R & D and manufacturing stage; since the 1990s, China's domestic enterprises began to enter the Motor industry. The rise of local enterprises to promote the Motor market prices, with the popularity of the application of its user base continues to expand, and gradually form the scale of industry. In the past few years, the domestic Motor industry developed rapidly, some companies began to develop vector control and four quadrants (PWM energy feedback) and other high-performance inverter, for a breakthrough in the high-end market applications, breaking the traditional two quadrant products confined to In the low-end market status quo, and gradually have a comprehensive alternative to foreign brands of technical strength.
At present, the domestic coal mine hoist speed control system mainly has DC speed control system and AC speed control system, DC speed control system using magnetic field commutation thyristor DC reversible speed control system, AC speed control system is divided into synchronous machine speed control system and asynchronous Machine speed control system, asynchronous Motor mainly with rotor series resistance speed. The above-mentioned speed control mode is backward, the running cost is big, and the running effect is not ideal. The four-quadrant Motor with energy feedback is used to drive the cage asynchronous Motor system directly. It has excellent mechanical characteristics similar to that of DC Motor. It has close to 1 power factor and energy conversion efficiency of more than 98%. The energy saving effect is very obvious With
The "IDrive vector control four-quadrant Motor" developed by ULS will be mainly used for frequent acceleration / deceleration or positive and negative conditions such as mine hoist, rolling mill and so on.
Second, IDrive vector control four quadrant converter introduction
2.1 system main circuit topology
The software algorithm mainly includes the network side active inverter and the Motor side vector control algorithm. Unit cascade multi-level Motor, the voltage range of up to 10kV, or even higher; with very low output harmonics, very low torque ripple and Motor noise, power factor up to 0.98, each unit design is completely consistent , Easy to replace, so easy to achieve redundant design; topology as shown below;
2.2 Unit main circuit topology
As the diode does not control the rectifier energy transfer is irreversible, the resulting regenerative energy is transmitted to the DC side filter capacitor, resulting in pump up voltage. The GTR, IGBT as the representative of the full control device voltage is low, too high pump voltage may damage the switching devices, electrolytic capacitors, and even damage the Motor insulation, thus threatening the safe operation of the system, which limits the ordinary The scope of the application of the Motor; energy feedback based on the system solution to solve these problems, and to achieve a real energy-saving goals rather than a waste of energy.
Energy feedback type power unit, the control signal is realized by a separate control module which includes the voltage signal of the secondary side winding of the sampling transformer, and the DC bus voltage and the inductor current signal, realize the four quadrant of the unit module through direct current control Function and power factor control, that part of the final result is to ensure that the output DC bus voltage of the good dynamic and static performance. And the control part of the inverter side is consistent with the conventional general Motor, and the multi-level control of the inverter side is realized by the master chip.
Input for the isolation transformer secondary side of the three-phase step-down winding, IGBT control signal for the transmission of the PWM signal through the optical control of its turn on and off, the output unit connected to the Motor. The cell topology is shown below;