Ezi-SERVO ST is an innovative closed loop stepping motor and controller that utilizes a high-resolution motor mounted encoder to constantly monitor the motor shaft position. The encoder feedback feature allows the Ezi-SERVO ST to update the current motor shaft position information every 25 micro seconds. This allows the Ezi-SERVO ST 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 creating a positioning error.
2. No Hunting
Traditional servo motor drives overshoot their position and try to correct by overshooting 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 ST Motion Control System! Ezi-SERVO ST 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.
3. Reduce the motor temperature and energy saving(Current control in proportion to the load)
Ezi-SERVO ST controls the motor current in proportion to the load automatically.
4. Improvement of torque by adjusting the RUN current(Max. 150%)
By adjusting the run current by changing the parameter, characteristic of torque and acceleration /deceleration can be improved and, accordingly, optimal operation condition can be matched with this function
[Measured Condition] Drive = Ezi-SERVO ST Motor Voltage = 40VDC Input Voltage = 24VDC
5. No Gain Tuning
Conventional servo systems, to ensure machine performance, smoothness, positional error and low servo noise, require the adjustment of its servo’s gains as an initial crucial step. Even systems that employ autotuning require manual tweaking after the system is installed, especially if more than one axis are interdependent. Ezi-SERVO ST employs the best characteristics of stepper and 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 ST is optimized for the application and ready to work right out of the box! The Ezi-SERVO ST system employs 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 ST is 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 added expense and bulk of a gearbox. Ezi-SERVO ST also performs exceptionally, even under heavy loads and high speeds!
6. Fast Response
Similar to conventional stepping motors, Ezi-SERVO ST instantly synchronizes with command pulses providing fast positional response. Ezi-SERVO ST is the optimum choice when zero-speed stability and rapid motions within a short distance are required. Traditional servo motor systems have a natural delay between the commanding input signals and the resultant motion because of the constant monitoring of the current position, necessitating in a waiting time until it settles, called settling time.
7. Smooth and Accurate
Ezi-SERVO ST is a high-precision servo drive, using a high-resolution encoder with 32,000[ppr]. Unlike a conventional Microstep drive, the on-board high performance DSP(Digital Signal Processor) performs vector control, filtering and producing a smooth rotational control with minimum ripples.
8. High Torque
Compared with common step motors and drives, Ezi-SERVO ST motion control systems can maintain a high torque state over relatively long period of time. This means that Ezi-SERVO continuously operates without loss of position under 100% of the load. Unlike conventional Microstep drives, Ezi-SERVO ST exploits continuous high-torque operation during high-speed motion due to its innovative optimum current phase control.