Advantages of permanent magnet servo motor

The servo motor, also known as the executive motor, is used as an executive element in the automatic control system to convert the electrical signal received into the angular displacement angular speed output on the motor shaft.

Servo motor is divided into DC AC servo motor two categories, its main feature is that when the signal voltage is zero, there is no rotation phenomenon, the speed decreases with the increase of torque. Ac servo motor performance is better, because AC servo is sine wave control, torque ripple is small; The brushless DC servo is trapezoidal wave control. But brushless DC servo control is relatively simple cheap. The rapid development of permanent magnet AC servo drive technology makes the DC servo system face the crisis of being eliminated.

Since the 1980s, with the development of integrated circuits, power electronics technology AC variable speed drive technology, permanent magnet AC servo drive technology has been prominent development, famous electrical manufacturers in various countries have continuously launched new AC servo motor servo drive series products. Ac servo system has become the main development direction of contemporary high-performance servo system, which makes DC servo system face the crisis of being eliminated.

Compared with DC servo motor, the main advantages of permanent magnet servo motor are:

⑴ No brush commutator, more reliable operation, maintenance-free.

⑵ The heating of the stator winding is greatly reduced.

(3) The inertia is small, the system has good fast response.

⑷ High speed large torque working condition is good.

(5) Small size light weight under the same power.

Due to the continuous improvement of permanent magnet materials, the price continues to decline, the control is simple, it is easy to achieve high performance, so the application of permanent magnet servo motor is more extensive.