Motor control systems: Difference between revisions
From Electrical Installation Guide
(updated according to guide 2013) |
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{| width="65% | {| class="wikitable" width="65%" | ||
|- | |- | ||
| | | | ||
! align="center" | I<sub>s</sub> / I<sub>n</sub> | |||
! align="center" | T<sub>s</sub> / T<sub>n</sub> | |||
! align="center" | Speed control | |||
! align="center" | Torque control | |||
|- | |- | ||
| '''Direct on line''' | | '''Direct on line''' | ||
| | | align="center" | 5-10 | ||
| | | align="center" | 5-10 | ||
| | | align="center" | No | ||
| | | align="center" | No | ||
|- | |- | ||
| '''Star – Delta''' | | '''Star – Delta''' | ||
| | | align="center" | 2-3 | ||
| | | align="center" | 1-2 | ||
| | | align="center" | No | ||
| | | align="center" | No | ||
|- | |- | ||
| '''Auto-transformer''' | | '''Auto-transformer''' | ||
| | | align="center" | 2-3 | ||
| | | align="center" | 1-2 | ||
| | | align="center" | No | ||
| | | align="center" | No | ||
|- | |- | ||
| '''Soft starter''' | | '''Soft starter''' | ||
| | | align="center" | 3-5 | ||
| | | align="center" | 1.5-2.5 | ||
| | | align="center" | No | ||
| | | align="center" | Yes | ||
|- | |- | ||
| '''Variable speed drive''' | | '''Variable speed drive''' | ||
| | | align="center" | 1.5 | ||
| | | align="center" | 1.5-2 | ||
| | | align="center" | Yes | ||
| | | align="center" | Yes | ||
|} | |} | ||
{| class="wikitable" width="65%" | |||
{| width="65% | |||
|- | |- | ||
| | | | ||
! align="center" | pros | |||
! align="center" | cons | |||
|- | |- | ||
| '''Direct on line''' | | '''Direct on line''' | ||
Revision as of 13:10, 15 November 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
