Motor control systems: Difference between revisions
From Electrical Installation Guide
m (1 revision imported: Migrated pages - removed CN links) |
|||
| (18 intermediate revisions by 5 users not shown) | |||
| Line 1: | Line 1: | ||
{{Menu_Characteristics_of_particular_sources_and_loads}} | {{Menu_Characteristics_of_particular_sources_and_loads}}__TOC__ | ||
Different kinds of motor control solution are compared in the following tables. | |||
{{tb-start|id=Tab1387|num=N75|title=Comparison of different motor control solutions|cols=5}} | |||
{| class="wikitable" | |||
{ | |||
| | |||
| | |||
{| | |||
|- | |- | ||
! align="center" | Type | |||
! 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 | |||
! align="center" | Pros | |||
! align="center" | Cons | |||
|- | |- | ||
| '''Direct on line''' | | '''Direct on line''' | ||
| | | align="center" | 5-10 | ||
Reduced cost | | align="center" | 5-10 | ||
| align="center" | No | |||
| align="center" | No | |||
| Reduced cost, high starting torque | |||
| | | High in-rush current | ||
High in-rush current | |||
|- | |- | ||
| '''Star – Delta''' | | '''Star – Delta''' | ||
| align="center" | 2-3 | |||
| align="center" | 1-2 | |||
| align="center" | No | |||
| align="center" | No | |||
| Reduced in-rush current | | Reduced in-rush current | ||
| Reduced starting torque | | Reduced starting torque | ||
|- | |- | ||
| '''Auto-transformer''' | | '''Auto-transformer''' | ||
| Reduced in-rush current | | align="center" | 2-3 | ||
| | | align="center" | 1-2 | ||
| align="center" | No | |||
| align="center" | No | |||
| Reduced in-rush current | |||
| High weight | |||
|- | |- | ||
| '''Soft starter''' | | '''Soft starter''' | ||
| | | align="center" | 3-5 | ||
Reduced in-rush current controlled start and stop | | align="center" | 1.5-2.5 | ||
| align="center" | No | |||
| align="center" | Yes | |||
| Reduced in-rush current, controlled start and stop | |||
| Reduced starting torque | | Reduced starting torque | ||
|- | |- | ||
| '''Variable speed drive''' | | '''Variable speed drive''' | ||
| | | align="center" | 1.5 | ||
Controlled speed Energy saving at reduced speed | | align="center" | 1.5-2 | ||
| align="center" | Yes | |||
| align="center" | Yes | |||
| Controlled speed, Energy saving at reduced speed | |||
| Higher cost | | Higher cost | ||
|} | |} | ||
Latest revision as of 17:52, 20 December 2019
Different kinds of motor control solution are compared in the following tables.
Fig. N75 – Comparison of different motor control solutions
| 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 |
