Method and circuit arrangment for controlling the r.p.m. of...

Details Method and circuit arrangment for controlling the r.p.m. of... Method and circuit arrangment for controlling the r.p.m. of...

H - Electricity

02

P

318/103

H02P 27/02 (2006.01)

Patent

CA 1172308

TITLE OF THE INVENTION: METHOD AND CIRCUIT ARRANGEMENT FOR CONTROLLING THE R.P.M. OF A THREE-PHASE MOTOR ABSTRACT OF THE DISCLOSURE: The present method and circuit arrangement control the r.p.m. of a three-phase motor connected in a star or Y- circuit by sensing current variations in the star point of the motor windings. These current variations are con- verted into voltage variations which represent the current input of the motor windings. These voltage variations are used to control the duration of the application of the operating voltage to the motor windings for varying the motor r.p.m. The circuit for this purpose includes a controlled diode circuit arrangement connecting the motor windings to the star point and a control or drive circuit for controlling the diode circuit arrangement. The drive circuit makes the diode circuit arrangement conductive for predetermined time durations which depend on the voltage variations. These time durations are also manually adjustable in an open loop control, whereby a closed loop control is provided in com- bination with an open loop control.

391673

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