Motor control systems: Difference between revisions
From Electrical Installation Guide
(Updated pros & cons) |
(updated according to guide 2013) |
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| '''Direct on line''' | | '''Direct on line''' | ||
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Reduced cost | Reduced cost, high starting torque | ||
| | | | ||
High in-rush current | High in-rush current | ||
| Line 68: | Line 65: | ||
| '''Star – Delta''' | | '''Star – Delta''' | ||
| Reduced in-rush current | | Reduced in-rush current | ||
| Reduced starting torque | | Reduced starting torque | ||
|- | |- | ||
| '''Auto-transformer''' | | '''Auto-transformer''' | ||
| Reduced in-rush current | | Reduced in-rush current | ||
| | | High weight | ||
|- | |- | ||
| '''Soft starter''' | | '''Soft starter''' | ||
| | | | ||
Reduced in-rush current controlled start and stop | Reduced in-rush current, controlled start and stop | ||
| Reduced starting torque | | Reduced starting torque | ||
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| '''Variable speed drive''' | | '''Variable speed drive''' | ||
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Controlled speed Energy saving at reduced speed | Controlled speed, Energy saving at reduced speed | ||
| Higher cost | | Higher cost | ||
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'''''Fig. N63a:''' Comparison of different motor control | '''''Fig. N63a:''' Comparison of different motor control solutions'' | ||
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Revision as of 08:17, 19 October 2013
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-transformer | 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, high starting torque |
High in-rush current |
| Star – Delta | Reduced in-rush current | Reduced starting torque |
| Auto-transformer | Reduced in-rush current | High weight |
| Soft starter |
Reduced in-rush current, controlled start and stop |
Reduced starting torque |
| Variable speed drive |
Controlled speed, Energy saving at reduced speed |
Higher cost |
Fig. N63a: Comparison of different motor control solutions
