Patent ID: 6208099
Filing Date: 2001-03-27
Classification: H02P,Y10S

Abstract:
An apparatus for controlling a motor and protecting said motor by limiting an amount of electric current supplied to said motor and controlling a driving force of said motor, comprising:a frequency detector for detecting a rotational frequency of said motor;a limiter controller for generating a current limiter control signal corresponding to the rotational frequency detected by said frequency detector; anda current limiter for limiting the amount of electric current supplied to said motor in accordance with said current limiter control signal;wherein said limiter controller generates a pulse width modulation signal comprising said current limiter control signal, said pulse width modulation signal having pulses of different duty cycle according to said detected rotational frequency in accordance with a plurality of execution modes; andwherein said limiter controller determines whether a present execution mode corresponds to one of said plurality of execution modes in which a limit amount of current of said current limiter is alterable, and alters a duty cycle for said one of said plurality of execution modes when said limiter controller determines that the present execution mode does correspond to said one of said plurality of execution modes in which the limit amount of current of said current limiter is alterable.