Katalog Ezi-Servo.PDF

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0904Ezi-SERVO.qxd
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1
Closed Loop System
The Ezi-SERVO is an innovative closed loop stepping motor
controller that utilizes a high-resolution encoder to constantly
monitor the current motor shaft position. With the encoder feed-
back feature, the Ezi-SERVO keeps updating the current position
information every 25 micro seconds. If necessary, the Ezi-SERVO
takes a corrective action to compensate the loss of
synchronization, for example, due to a sudden load change,
eliminating missing step error, which is a typical drawback with
stepping motors.
2
No Gain Tuning
In order to improve a control performance, tuning the gains of a
servo system is the most crucial step. Depending on the source of
a load change, this is a long, tedious, troublesome, and time-
consuming job for an application field engineer. The Ezi-SERVO
fully employs the unique characteristics of the closed
loop stepping motor control, eliminating these
cumbersome steps and giving the engineer
a similar satisfaction with a high perf-
ormance servo system. Especially,
Ezi-SERVO is well suited for
low stiffness loads (for example,
a belt and pulley system)
that are common problems
experienced in a most
servo system, while still
maintaining the best
performance
in all situations.
3
No Hunting
Contrary to a traditional servo motor drive, there is no problem of
hunting in the Ezi-SERVO that utilizes the unique feature of
stepping motors. After reaching a desired target position, Ezi-
SERVO does not experience a fluctuation in motion. This feature is
especially useful in an application such as vision systems in which
vibration could be a problem.
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4 Smooth and Accurate
7
High Torque
Ezi-SERVO is a high-precision servo drive, using a high-resolution
encoder with 10,000 pulses/revolution.
Unlike a conventional
microstep drive, the
on-board high per
formance DSP
(Digital Signal
Processor) performs
a vector control and
filtering, producing
a smooth rotational
control with
minimum ripples.
Compared with common step motors, Ezi-SERVO can maintain a
high torque state over relatively long period of time. It is possible
for the driver to continuously operate without loss of synchronism
under 100% of the load, there is no need to concern the load-
tolerance, opposing to conventional microstep drives. Ezi-SERVO
exploits high-torque in high-speed regime owing to the innovative
optimum current phase control in accordance with rotational
speeds.
5 Fast Response
Similar to conventional stepping motors, Ezi-SERVO shows good
synchronization with commanding pulses and realizes a short and
fast response in a positioning action. Thus, it is a great feature of
Ezi-SERVO when rapid motions with a short distance are required.
For the case of traditional servo motor systems, there is a
considerable delay between the commanding input signals and
the resultant motion because of the constant monitor of the
current position, necessitating a waiting time until it settles, called
settling time.
8
High Speed
The Ezi-SERVO functions well at high speed without the loss of
synchronism. The ability of continuous monitoring of current
positions enables a stepping motor to generate high-torque, even
under a 100% load condition.
6 High Resolution
The unit of the position command can be divided precisly.
(max. 10,000 pulses/revolution)
9
Load-dependant Current Control
Since the drive controls the operating current depending on the
variation of a load condition, it is possible to reduce the heat
generation,in turn improving the efficiency.
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Part Numbering
Combination list of Ezi-SERVO
Advantages over Open-loop Control Stepping Drive
1. Reliable positioning without loss of synchronism.
2. Holding stable position and automatically recovering to the original position even after experiencing
positioning error due to a external force, such as mechanical vibration.
3. EZi-SERVO covers 100% full range of the rated torque, contrary to a conventional open-loop stepping
driver that can use only up to 50% of the rated torque by considering loss of synchronism.
4. Capability to operate at high speed owing to a load-dependant current control, whereas open-loop
drivers use a constant current control at all speed range without considering load variations.
Advantages over servo motor controller
1. No gain tuning(Automatic adjustment of gain in response to a load change.)
2. Maintain the stable holding position without fluctuation after completing positioning.
3. Possible to fast positioning owing to the independent control by on-board DSP.
4. Favorable continuous operation at short-stroke rapid movement process thanks to short positioning time.
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