4. Switched reluctance motor
Switched reluctance motor is a new type of speed-regulating motor. Its structure is extremely simple and sturdy, its cost is low, and its speed regulation performance is excellent. It is a strong competitor of traditional control motors and has strong market potential. However, there are also problems such as torque ripple, running noise and vibration, and it takes time to optimize and adapt to the actual market application.
5. Brushless DC motor
Brushless DC motor (BLDCM) is developed on the basis of brushed DC motor, but its driving current is uncompromising AC; brushless DC motor can be divided into brushless speed motor and brushless torque motor. . Generally, there are two kinds of driving currents of a brushless motor, one is a trapezoidal wave (generally "square wave"), and the other is a sine wave. Sometimes the former is called DC brushless motor, the latter is called AC servo motor, and it is also a kind of AC servo motor.
In order to reduce the moment of inertia, brushless DC motors usually adopt a "slender" structure. Brushless DC motors are much smaller in weight and volume than brushed DC motors, and the corresponding moment of inertia can be reduced by 40% to 50%. Due to the processing of permanent magnet materials, the general capacity of brushless DC motors is below 100 kW.
The motor has good linearity of mechanical characteristics and adjustment characteristics, wide speed range, long life, easy maintenance and low noise, and there is no series of problems caused by brushes. Therefore, this kind of motor has great control system. Application potential.
