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Common shaft with multiple AC motors - Case from the cement industry
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| Author(s) |
G. A. Christopoulos; A. N. Safacas; V. Manninen |
| Abstract |
Investigation of load parameters and how these affect the operation of a kiln drive system consisting of
two a.c. motors 315 kW size each, on common tooth gear. Two separate inverter units control the motors
with common rectifier. Backlash problems of tooth gear due to machinery wear cause rapid torque
changes demanding dynamic performance in controlling all IGBTs switching procedure, based directly on
the electromagnetic state of the motor. The issues that are investigated:
1. Ensuring torque share between motors on a fast change bases with help of Torque Control on the
AC motors
2. Ensuring immediate high torque at low speed start. (more than 200%)
3. Process requirement - speed reference behaviour with load change
4. Process requirement- fast changes of needed power due to mechanical stretches and load
changes
The main problem is the backlash effect, which leads to rapid and unpredictable regenerative operation to
any motor, since the one (motor) pulls the other. These electrical energy returning effects and relevant
machinery vibration are solved by direct torque control since the total drive system is not regenerating. |
| Download |
| Filename: | EPE2003-PP1115 - Christopoulos |
| Filesize: | 320.1 KB |
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| Type |
Members Only |
| Date |
Last modified 2003-10-13 by Unknown |
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