Advantages of Switched Reluctance Motor Drive System
Advantage 1 Switched reluctance motors do not use rare earth permanent magnet materials such as neodymium iron boron
Rare earth permanent magnet materials are controlled rare materials at the national and international levels, with limited storage capacity. They will be concentrated in key industries such as aerospace, navigation, and high-end robots in the future, and are not sufficient to support the widespread use of new energy vehicle motors.
The original mining and refining methods have caused extremely serious environmental pollution to rare earth mining areas and refining locations. New environmental protection measures will further increase the cost of mining and refining neodymium iron boron materials, and the continued doubling and price increase of permanent magnet materials is not just talk.
Although the temperature resistance of permanent magnet materials has made significant progress in recent years, there has still been no breakthrough in areas such as eddy current resistance, pulsating torque, and vibration impact. The efficiency and torque degradation caused by long-term demagnetization cannot be avoided.
The maintainability of high-power permanent magnet motors is poor.
The disposal of scrapped permanent magnet materials is extremely difficult, and the environmental pollution it causes will be unbearable for humans.
Advantage 2: The fixed rotor structure of switched reluctance motors is the simplest and most reliable in typical high-power motors.
The stator only has a centralized winding, with a simple insulation structure, and the probability of stator winding breakdown between phases is very small. The rotor is only made of stacked silicon steel sheets, without guide bars or magnetic steel. It has the best mechanical strength under high-speed operation and can be used in various harsh environments, such as high temperature and strong vibration.
Advantage 3: Simple structure, fewer manufacturing processes, and easy implementation of automated production.
Advantage 4: Reliable work
Circuit reliability: Each power component is directly connected in series with the motor winding, avoiding the phenomenon of direct short circuit.
When there is a phase loss, the motor can still work. When a phase loss fault occurs, the output power of the motor decreases, but it can still operate.
Advantage 5: The efficiency is much higher than that of AC asynchronous motor systems driven by frequency converters.
It is a synchronous motor driven by a dedicated controller, without losses caused by rotor slip, therefore, its efficiency is much higher than that of AC asynchronous motor systems driven by frequency converters. And it has good controllability in the complete four quadrants of electric, forward and reverse, braking, and power generation, with relatively perfect torque tracking/speed response capabilities. At the same time, it has reliable and stable overload capacity and ideal efficiency characteristics in a wide range of speed and torque changes.
Overall analysis shows that switched reluctance motors are excellent driving systems for applications such as impact loads, variable loads, heavy load starting, frequent start stop, and are also very suitable for driving construction machinery.