Switched reluctance motor
efficient. Energy saving effect: In all speed and power ranges, the overall efficiency of CD is at least 3% higher than that of AC asynchronous motor frequency conversion speed control system (referred to as frequency conversion speed control), and its efficiency can be increased by more than 10% under low speed working conditions. Compared with DC speed regulation, cascade speed regulation, electromagnetic speed regulation and other systems, CD power saving effect is more obvious.
The starting torque is large, especially suitable for those occasions that require heavy load starting and the load changes are obvious and frequent. The CD controller absorbs less current from the power supply side, and can obtain a larger starting torque on the motor side. When the starting torque reaches 150% of the rated torque, the starting current is only 30% of the rated current, compared with the AC motor 300% current to obtain 100% torque performance. The advantages are obvious.
Wide range of speed regulation: The motor can run for a long time at low speed. Due to high efficiency. The temperature rise at low speed is lower than that at rated industrial and mining. Solve the problem of motor heating under low-speed operation of frequency conversion speed regulation. In addition, the maximum speed of the CD motor is not limited by the number of poles as with the AC motor. The maximum speed can be flexibly set according to actual needs.
Frequent forward and reverse rotation, frequent start and stop. Therefore, it is very suitable for applications such as gantry planers, reversible rolling mills, oil field pumping units and so on.
The starting current is small, avoiding the impact on the power grid. CD has soft starting characteristics, and there is no phenomenon that the starting current of ordinary AC motor is greater than 5-7 times of rated current.
High power factor, no need to install no power compensation device. Ordinary AC motors have a power factor between 0.2 and 0.4 and a full load between 0.8 and 0.9; while a switched reluctance motor speed control system has a power factor greater than 0.98 under no and full load.
The structure of the motor is simple and firm, the manufacturing process is simple, and the cost is low. The work is reliable and can be applied to various harsh, high temperature and even strong vibration environments.
It can still work under phase loss and overload. In the event of a power supply phase loss, or a fault in either direction of the motor or controller, the motor output power is reduced, but it can still run. When the system exceeds 120% of the rated load, the speed will only decrease without burning the motor or controller.
Because the power converter in the controller is connected in series with the motor winding, there will be no through fault that may occur in the power converter of the variable frequency speed regulation system, and the reliability is greatly improved.
It can realize four-quadrant operation, with constant torque characteristic at rated speed, and constant power characteristic when it exceeds rated speed.
Especially suitable for pumping unit, energy saving 30% -60% than conventional pumping unit motor.
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