Fastech Closed Loop Stepping Systems

Compared to open-loop stepper motors, these products have reliable positioning without loss of synchronicity. The position is reliably held and gets corrected automatically in the event of positioning errors due to the action of external mechanical forces. In contrast to open-loop stepper motors, the full 100% of the motor torque can be used without loss of synchronicity. The load-dependent current control also enables operation at high speeds.

Compared to servo motor controllers, there is no gain tuning and maintains the stable holding position without oscillation after completion of positioning. The integrated MCU enables fast positioning and continous operation with fast response times.

Key Features
Closed Loop System

Ezi-SERVO and Ezi-SERVOⅡ are innovative Closed Loop Systems that utilize a high-resolution motor mounted encoder constantly to monitor the current position. The encoder feedback allows the Ezi-SERVO to update the current position every 25 µsec and the Ezi-SERVOⅡ 50 µsec. It allows the Ezi-SERVO and Ezi-SERVOⅡ drive to compensate for the loss of position, ensuring accurate positioning. For example, due to a sudden load change, a conventional stepper motor and drive could lose a step but Ezi-SERVO and Ezi-SERVOⅡ automatically correct the position by encoder feedback.

No Gain Tuning

To ensure machine performance, smoothness, positional error and low servo noise, conventional servo systems require the adjustment of its servo’s gains as an initial crucial step. Even systems that employ auto-tuning require manual tuning after the system is installed, especially if more that one axis are interdependent. Ezi-SERVO and Ezi-SERVOⅡ employ the best characteristics of stepper, closed loop motion controls and algorithms to eliminate the need of tedious gain tuning required for conventional closed loop servo systems. This means that Ezi-SERVO and Ezi-SERVOⅡ are optimized for the application and ready to work right out of the box. The Ezi-SERVO and Ezi-SERVOⅡ systems employ the unique characteristics of the closed loop stepping motor control, eliminating these cumbersome steps and giving the engineer a high performance servo system without wasting setup time. Ezi-SERVO and Ezi-SERVOⅡ are especially well suited for low stiffness loads (for example, a belt and pulley system) that sometime require conventional servo systems to inertia match with the additimal expensive and bulky gearbox. Ezi-SERVO and Ezi-SERVOⅡ also perform exceptionally, even under heavy loads and high speeds.

No Hunting

Traditional servo motor drives overshoot their position and try to correct overshooting by moving the opposite direction, especially in high gain applications. This is called null hunt and is especially prevalent in systems that the break away or static friction is significantly higher than the running friction. The cure is lowering the gain, which affects accuracy or using Ezi-SERVO and Ezi-SERVOⅡ Motion Control Systems. Ezi-SERVOⅡ utilizes the unique characteristics of stepping motors and locks itself into the desired target position, eliminating Null Hunt. This feature is especially useful in applications such as nanotech manufacturing, semiconductor fabrication, vision systems and ink jet printing in which system oscillation and vibration could be a problem.

Smooth and Accurate

Ezi-SERVO and Ezi-SERVOⅡ are high-precision servo drives, using a high-resolution encoder with up to 32,000 pulses/revolution. Unlike a conventional Microstep drive, the on-board high performance MCU (Micro Controller Unit) performs vector control and filtering, producing a smooth rotational control with minimum ripples.

Fast Response

Similar to conventional stepping motors, Ezi-SERVO and Ezi-SERVOⅡ instantly synchronize with command pulses providing fast positional response. Ezi-SERVO and Ezi-SERVOⅡ are the optimum choice when zero-speed stability and rapid motions within a short distance are required. Traditional servo motor systems have a natural delay called settling time between the command input signals and the resultant motion because of the constant monitoring of the current position.

High Torque

Compared with common step motors and drives, Ezi-SERVO and EziSERVOⅡ motion control systems can maintain a high torque state over relatively long period of time. This means that Ezi-SERVO and Ezi-SERVOⅡ continuously operate without loss of position under 100% of the load. Unlike conventional Microstep drives, Ezi-SERVO and Ezi-SERVOⅡ exploit continuous high torque operation during high speed motion due to its innovative optimum current phase control.

High Speed

The Ezi-SERVO and Ezi-SERVOⅡ operate well at high speed without the loss of synchronism or positioning error. Ezi-SERVO and Ezi-SERVOⅡ’s ability of continuous current position monitoring of enables the stepping motor to generate high torque, even under a 100% load condition.

Heat Reduction / Energy Saving

Ezi-SERVO and Ezi-SERVOⅡ automatically control motor current according to load. Ezi-SERVO and Ezi-SERVOⅡ reduces motor current when motor load is low and increases motor current when load is high. By optimizing the motor current, motor heat can be minimized and energy can be saved.

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