stepper motor driver ES-D 808 / Closed Loop System
Product description:
- Closed loop system
- No lost steps
- Fast response to position errors
- No setting or configuration necessary
- No transient response (hunting)
- Smooth and precise movement
- High torque and low heating
- Energy saving
Product features:
Conventional open-loop stepper systems work in an open loop, which means position control without feedback. When open-loop stepper motors operate under load, a potential loss of synchronization between commanded and actual steps can occur, referred to as "stall" or "step loss." In the past, this was addressed by adding a feedback device such as an optical encoder that monitors the "current" position. However, this implementation can only alert, not correct, step losses.
Until now, when an application requires real-time position control during motion, engineers have been forced to resort to servo systems and the associated complexity and much higher cost. In many applications, because traditional servo systems lack high torque compared to stepper motor systems, expensive planetary gears had to be added to achieve the desired torque.
By implementing high-resolution encoders that report motor position every 25 microseconds, closed-loop stepper drives guarantee real-time controlled position accuracy without loss of steps like open-loop stepper motor systems.
Attention: There are systems that are called “closed loop” and also work with encoders, but do not have field-oriented control including sine-commutated current control. Although these check the step position, they cannot compensate for step angle errors during the movement.
Our closed-loop systems have field-oriented control, so they compensate for step losses during movement and correct load angle errors within a full step!
Unlike open-loop stepper motor systems where the current is constant, the output current in closed-loop stepper motor systems varies and is optimized based on the specific motion and load. Therefore, closed-loop stepper motor systems produce higher torque, lower motor heating, lower vibration and less noise than open-loop stepper motor systems.
Compared to brushless or brush servo systems, the costs for closed-loop stepper motor systems are significantly lower. In addition, they offer much higher torque, easy adjustment and configuration, no overshoot and no hunting. In many low to medium applications, closed-loop stepper motor systems can be a better solution than servo systems.
Electrical specification:
|
parameters
|
Min |
Typical. |
Max
|
Unit |
|
Output current
|
0
|
-
|
8.0 (Peak)
|
A
|
|
Input voltage
|
20
|
36
|
50
|
VDC
|
|
Logic signal current
|
7
|
10
|
16
|
ma
|
|
Pulse input frequency
|
0
|
-
|
200
|
kHz
|
|
Insulation resistance
|
500
|
|
|
M?
|
