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High efficiency of switched reluctance motors

High efficiency of switched reluctance motors

  • Categories:Company News
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  • Time of issue:2020-05-24 20:43
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(Summary description)In all speed and power ranges, the overall efficiency of CD is at least 3% higher than that of AC asynchronous motor variable frequency speed control system (referred to as variable frequency speed control), and its efficiency can be increased by more than 10% under low-speed working conditions.

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High efficiency of switched reluctance motors

High efficiency of switched reluctance motors

img

High efficiency of switched reluctance motors

(Summary description)In all speed and power ranges, the overall efficiency of CD is at least 3% higher than that of AC asynchronous motor variable frequency speed control system (referred to as variable frequency speed control), and its efficiency can be increased by more than 10% under low-speed working conditions.

  • Categories:Company News
  • Author:
  • Origin:
  • Time of issue:2020-05-24 20:43
  • Views:
Information
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 variable frequency speed control system (referred to as variable frequency speed control), and its efficiency can be increased by more than 10% under low-speed working conditions. Compared with DC speed control, cascade speed control, electromagnetic speed control and other systems, CD has a more obvious power saving effect.
Large starting torque, especially suitable for those occasions that require heavy-load starting and obvious and frequent load changes. 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, which is compared with AC motors. 300% of the current to obtain 100% torque performance. The advantages are very obvious.
Wide speed range: the motor can run for a long time at low speed. Because of high efficiency. The degree of temperature rise at low speeds is lower than that of rated industrial and mining operations. Solve the problem of motor heating under variable frequency speed regulation and low speed operation. In addition, the maximum speed of CD motors is not limited by the number of poles like AC motors. The maximum speed can be flexibly set according to actual needs.
It can be frequently forward and reverse, and frequently start and stop. Therefore, it is very suitable for applications such as gantry planers, reversible rolling mills, and oil field pumping units.
The starting current is small, avoiding the impact on the power grid. CD has soft start characteristics, and there is no phenomenon that the starting current of ordinary AC motors is 5-7 times greater than the rated current.
High power factor, no need to install non-power compensation device. The power factor of an ordinary AC motor at no load is between 0.2-0.4 and between 0.8-0.9 at full load; while the power factor of the switched reluctance motor speed control system at no load and full load is greater than 0.98.
The motor has a simple and firm structure, simple manufacturing process and low cost. It works reliably 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 power supply lack of phase, motor or controller failure in either direction, the output power of the motor is reduced, but it can still run. When the system exceeds the rated load by more than 120%, the speed will only drop without burning the motor or controller.
Since the power converter in the controller is connected in series with the motor windings, there will be no direct faults 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 characteristics under rated speed, and constant power characteristics when exceeding rated speed.
It is especially suitable for pumping units, which can save 30%-60% energy compared with conventional pumping unit motors.

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