Starter for an electric motor and process for its operation

Details Starter for an electric motor and process for its operation Starter for an electric motor and process for its operation

H - Electricity

02

P

318/63

H02P 1/28 (2006.01)

Patent

CA 1203006

A b s t r a c t The invention relates to a starter for an electric motor with n resistors arranged in each phase of the motor, whereby n is an integer. By switches and a controller 2n combinations of resistors can be switched in series with the motor. For starting the motor at most 2n combinations are sequentially switched on, arranged according to decreasing resistance value. The on time of the combinations is preselected for attaining a pre- determined characteristic curve of current increase. With a starter according to this invention the individual resistors can be of relatively low load capacity and therefore small and electric motors even under heavy load can be started without heavy current surges and in finely spaced steps.

424167

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