Rotary machine control
The present invention discloses devices and methods for improved starting and stopping of rotary motors. A rotary electrical machine ( 3 ) is supplied with a voltage from a voltage supply ( 10 ). The magnitude of a phase current is measured. The measured cuurent value (IM) and applied voltage (U) is...
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| Main Authors | , |
|---|---|
| Format | Patent |
| Language | English |
| Published |
22.01.2004
|
| Online Access | Get full text |
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| Summary: | The present invention discloses devices and methods for improved starting and stopping of rotary motors. A rotary electrical machine (
3
) is supplied with a voltage from a voltage supply (
10
). The magnitude of a phase current is measured. The measured cuurent value (IM) and applied voltage (U) is compared with what is expected for a predetermined target slip (S
T
), by means of a relation between phase current, applied voltage and slip. The comparison gives a discrepancy value, which is used to create a regulation signal ( U) to the voltage supply (
10
). To start and stop the machine, the target slip is increased and decreased, respectively, in a predetermined manner. The means for regulation may be provided as a separate add-on unit to existing soft starter equipment. |
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