Turnstile servo drive ?The motor is a commonly used actuator in automated industrial production, with a wide range of applications. AC servo motors exhibit excellent dynamic response: they can accelerate from standstill to their rated speed in just a few milliseconds—tens or even hundreds of times faster than stepper motors. They are well suited for control applications that require rapid start-up and stop. Today, let’s take a closer look at this type of motor.

I. Main Features

First, the starting torque is relatively large; as soon as a control voltage is applied to the stator, the rotor immediately begins to rotate, giving servo motors fast response and high sensitivity. Second, they have a wide operating speed range. In addition, servo drive motors do not exhibit self-rotation; when a normally running servo motor loses its control voltage, it stops immediately.

II. Operating Principle

A servo motor also consists of a stator and a rotor, with the rotor being a permanent magnet. The three-phase current controlled by the drive first generates an electromagnetic field in the stator windings, causing the rotor to rotate under the influence of this field. Simultaneously, the servo motor uses an encoder to feed back the rotational position signal to the drive, enabling closed-loop control that adjusts the rotor’s angular position within the drive to achieve precise positioning.

III. Differences from Stepper Motors

A servo motor controls the rotation angle by regulating the duration of the pulse signals it receives, with positioning accuracy ensured by a rotary encoder mounted on the motor shaft. This accuracy can often be several thousand times greater than that of a stepper motor, enabling more precise position control. AC servo drive systems operate in closed-loop mode: during operation, the drive continuously samples the feedback signal from the motor encoder and makes real-time adjustments, thereby minimizing the likelihood of missed steps or overshoot and delivering more reliable control and operational performance.

In general, servo-driven turnstile motors outperform stepper motors in many respects. Of course, they are also significantly more expensive than stepper motors; therefore, in applications with relatively low control requirements, stepper motors can still be used as the actuating element. In practical industrial process control, it is essential to take a comprehensive approach, weighing factors such as control requirements, performance, cost, and operating environment, in order to select the most appropriate type of control motor.