Electrical motor over-current protection interrupts current to motor windings

Electrical motor over-current protection interrupts current to motor windings

A microcontroller 4 provides the driving current to the windings of an electrical motor. The motor current is taken as one input 9 to a comparator 8 whose threshold input 10 is derived from a voltage divider circuit 11,12. In the event of an over-current condition the driving current to the windings...

Ausführliche Beschreibung

Gespeichert in:
Bibliographische Detailangaben
Hauptverfasser: HENRY RIDDOCH, NIGEL DAVID STRIKE
Format: Patent
Sprache:eng
Schlagworte:
CONTROL OR REGULATION OF ELECTRIC MOTORS, ELECTRIC GENERATORSOR DYNAMO-ELECTRIC CONVERTERS
CONTROLLING TRANSFORMERS, REACTORS OR CHOKE COILS
CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
ELECTRICITY
EMERGENCY PROTECTIVE CIRCUIT ARRANGEMENTS
GENERATION
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Beschreibung
Zusammenfassung:A microcontroller 4 provides the driving current to the windings of an electrical motor. The motor current is taken as one input 9 to a comparator 8 whose threshold input 10 is derived from a voltage divider circuit 11,12. In the event of an over-current condition the driving current to the windings in interrupted. Alternatively the threshold input may be a variable determined by the output of a low pass filter 14,15 which takes a variable frequency waveform as its input. The waveform is controlled by the microcontroller by output 16.