Motor control systems: Difference between revisions
From Electrical Installation Guide
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Different kinds of motor control solution are compared in the following tables. | Different kinds of motor control solution are compared in the following tables. | ||
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! align="center" | I<sub>s</sub> / I<sub>n</sub> | ! align="center" | I<sub>s</sub> / I<sub>n</sub> | ||
! align="center" | T<sub>s</sub> / T<sub>n</sub> | ! align="center" | T<sub>s</sub> / T<sub>n</sub> | ||
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'''''Fig. N63:''' Comparison of different motor control solutions'' | '''''Fig. N63:''' Comparison of different motor control solutions'' | ||
Revision as of 08:53, 8 December 2016
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. N63: Comparison of different motor control solutions
