Motor control systems: Difference between revisions
From Electrical Installation Guide
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! align="center" | Speed control | ! align="center" | Speed control | ||
! align="center" | Torque control | ! align="center" | Torque control | ||
! align="center" | | ! align="center" | Pros | ||
! align="center" | | ! align="center" | Cons | ||
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| '''Direct on line''' | | '''Direct on line''' |
Revision as of 05:49, 11 December 2016
Different kinds of motor control solution are compared in the following tables.
Type | Is/In | Ts/Tn | Speed control | Torque control | Pros | Cons |
---|---|---|---|---|---|---|
Direct on line | 5-10 | 5-10 | No | No | Reduced cost, high starting torque | High in-rush current |
Star – Delta | 2-3 | 1-2 | No | No | Reduced in-rush current | Reduced starting torque |
Auto-transformer | 2-3 | 1-2 | No | No | Reduced in-rush current | High weight |
Soft starter | 3-5 | 1.5-2.5 | No | Yes | Reduced in-rush current, controlled start and stop | Reduced starting torque |
Variable speed drive | 1.5 | 1.5-2 | Yes | Yes | Controlled speed, Energy saving at reduced speed | Higher cost |
Fig. N63 – Main characteristics of different motor control solution