Tri-phase AC asynchronous motor controller（IMS series）controls tri-phase asynchronous motor, which is applied to elevator door machine, and realized the automatic control for the door machine.It is the newer drive and control technology after VVVF drive technology.It is provided a wide place for remove of the elevator intelligent control technology, because of the complete digital control to motor with 32-bit CPU, and the function of communication.

   After inspection, our servo controllers accord with the standards, including operated noise is not more than 47dB,opening/closing time is not more than 3-second (1000mm opening width), and steady, credible closing power limitation,which are all requested by GB7588-1995 :" Secure Criterion of Elevator Production and Installation" and GB/T10058-1997 " Elevator Technical Condition".
（A） Systematic Characteristic Index
1. Systematic match: AC servo controller, AC servo motor,special coder and interface
2. Power range：0.2kw 、0.4kw、0.75kw
3. Max.openning speed：10m/s
4. Positioning control range：1-99999999 pulse
5. Openning moment control accuracy：5%
6. Acceleration and deceleration：0.05-3000Hz
7. Self-learning function
8. No impact and noise
（B）Technical Innovative Point
1. AC asynchronous motor apply control system could make accurat positioning control,and its control accuracy is improved one more numerial stage than other door machne system.
2. Realized the intelligent control of closed moment with electry controlled to ensure the safety of passengers.
3. Be able to programme lots of functions (self-learning ,door open/close,close-power inspection,close-power maintenance, and fire operation) according to the operated principle, improve the character of it.
4. Synchronous knives technology to ensure the door is open and close synchronously.
5. Synchronous transmission mode with machine, it will make the structure simple and also make the noice lower.
6. Eliminated the limit of door open width,700-3600mm none-stage door open width can be realized on the theory.
7. Multiple opening-mode: center opening door, partial opening door and center opening double-fold door, etc.
8. Control signal may be the effectual +24V,and also the effectual 0V.
9．With whole software programme,complete digital control mode make the system safe,reliable and complete.
10. Couple with different car of different manufactories.
（C）Control Function of IMS Elevator Door Machine Controller
1. Speed control operation
The control system would keep best situation,only if you select the satisful speed. In the operate process,it will be watched feedback frequency to get smooth speed performance curve(map).

2. Torque control operation
① Open and close smoothly
Output torque can be adjusted automaticly, so in the range of max.output torque(can be adjusted),the electromotor may output proper touque according to the change of operated resistance to keep the smooth action.

② Feedback torque inspection operation
Safe return operation（avoid nipping someone）： If someone are nippedwhen colse the door,the control system woould inspect the change of feedback moment immediately,and the door would open opposite direction to guarantee the security.
③ Push prevented operation
When the door is close,the controller may be driven motor to continue pressing with low speed and small moment in order to close the door tightly.When it is inspected special moment change( someone push the door),it would ensure to close the door,and after comeback,it may remove automaticly. Pressing power to ensure colsing the door.
3. Positioning control operation
① Accurate position,it is able to make any action including acceleration and deceleration in appointed position.
② Self-learning operation
According to different model,start/stop width and different operation,there are automatic self-learning program before regular use for this control system to record its operate position,and the operate demond can be realized after parameter simple set.This function is operated automaticly in every electrification, which plays a rule to find sero. It may also order the original situation according to your requirments.

（D）Conclusion
1. The structure of elevator door machinecan be greatly simplied.
2. Simple transmission motor structure,longgevity and no maintenance.
3. Automatic control to the elevator door machine.
4. No malfunction in ten thousands of credible tests, so there are well reflection.