2-Phase Stepper Servo System

MotionKing (China) Motor Industry Co., Ltd.

www.MotionKing.com

MK1502, Rev.02

- 2 -

By adopting high resolution encoders, MotionKing MEZ servo products apply servo controls on high torque stepper motors.

Those products combine advantages of brushless servo systems and conventional stepper systems.

Compare to traditional Steppers

1. Closed-loop, eliminates loss of synchronization

In open-loop stepper systems, potential loss of motor movement synchronization limits their

adoption for many applications. Engineers are forced to reserve 50% of available stepper

motor torque to avoid possible loss of steps or stall. With the adoption of high resolution

encoders to feedback real time motor shaft positions, MotionKing MEZ series servo drives

close the position loops between servo drives and driven motors. That will keep motor

movement synchronized all the time, and allow 100% of available torque.

2. No torque resovation for broader operating range

Due to closed loop control and adoption of advanced control algorithm, the MEZ series servo

systems can always implement 100% torque of the motor, and do not need the huge 50%

torque reservation in normal open-loop stepper systems. This feature significantly improves

system high speed performance. While open-loop stepper systems are typically adopted in

applications under 1,000 rpm, the MEZ series servo systems are ideal for many applications up

to 2,000 RPM, sometimes even to 3,000 RPM!

3. Quicker Response, Higher Acceleration

Also due to closed loop control and adoption of advanced control algorithm, the MEZ series

servo systems can always implement 100% torque of the motor. This feature significantly

improves system response or acceleration performance, usually up to 30% quicker or higher

acceleration than a same size and holding torque conventional steppers.

4. Extra low motor heating

In open-loop stepper systems, output current to the stepper motor from the step driver is

constant. No matter what load condition is and how much current is needed, the stepper drive

will always output a constant current. Since the MEZ servo runs in closed-loop, the MEZ drives

only put as much current into the motor as required to drive the motor to the target. Motor heat

is 20 to 40

the time. Less power consumption and longer motor lifetime can be achieved, reducing using

and maintenance cost.

Compare to Servos