Motor control systems: Difference between revisions
From Electrical Installation Guide
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Revision as of 14:10, 9 February 2012
Different kinds of motor control solution are compared in the following tables.
| Is / In | Ts / Tn | Speed control | Torque control | |
| Direct on line | 5-10 | 5-10 | No | No |
| Star – Delta | 2-3 | 1-2 | No | No |
| Auto-tranformer | 2-3 | 1-2 | No | No |
| Soft starter | 3-5 | 1.5-2.5 | No | Yes |
| Variable speed drive | 1.5 | 1.5-2 | Yes | Yes |
| pros | cons | |
| Direct on line | Reduced cost Hight starting torque when necessary |
Hight in-rush current, High torque so high contrainsts on motor, mechanics, ... not necessarily needed for the application starting |
| Star – Delta | Reduced in-rush current | Reduced starting torque, switching voltage & currents |
| Auto-tranformer | Reduced in-rush current | Hight weight |
| Soft starter |
Reduced in-rush current controlled start and stop Interesting solution in medium voltage as good value for money |
Reduced starting torque |
| Variable speed drive |
Controlled speed Energy saving at reduced speed Sometimes the main "modern" solution according to the driven process characteristics |
Higher cost |
Fig. N63a: Comparison of different motor control solution
