US 5,835,676 AGranted

Motor driving apparatus

AssigneeBrother Kogyo Kabushiki Kaisha

InventorsYoshiaki Komatsu, Motoaki Yamanashi

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Abstract

An apparatus for driving an electric motor, including a full-wave rectifier which rectifies an alternating current supplied from an alternating-current power supply, and supplies a full-wave rectified current to the motor, a chopper which chops the full-wave rectified current supplied from the rectifier to the motor so that the chopped current is applied to the motor, and a control device which generates a chopping pulse signal having a first signal characteristic corresponding to a given motor control target and a second signal characteristic to reduce an alternating-current component of the full-wave rectified current supplied to the motor, the control device supplying the chopping pulse signal to the chopper so that the chopper chops the full-wave rectified current according to the chopping pulse signal.

Claims103

Dependent claims

An apparatus for controllably driving an electric motor powered by an alternating current power supply, the apparatus comprising:

a full wave rectifying circuit which rectifies an alternating current of an alternating electric signal supplied by the alternating current power supply and outputs an initial full wave rectified signal having an initial full wave rectified current that includes a plurality of cyclic waves corresponding a plurality of half cycles of the alternating electric signal, respectively;
a current supply circuit which supplies a pulse width modulated full wave rectified current to the electric motor by controllably interrupting the supply of each of the cyclic waves of the initial full wave rectified current during an entire interval of each of said cyclic waves to the electric motor based on a pulse width modulation signal, so that the electric motor is supplied with an electric current having a substantially constant magnitude during a substantially entire interval of each of said cyclic waves;
and
a current supply control circuit which generates and outputs the pulse width modulation signal to the current supply circuit, the current supply control circuit generating the pulse width modulation signal based on a selected motor control target value and a counted value, the counted value indicative of a state of the initial full wave rectified signal.

1 more element

A method for controllably driving an electric motor powered by an alternating current power supply, the method comprising:

rectifying an alternating current of an alternating electric signal supplied by the alternating current power supply to generate an initial full wave rectified signal having an initial full wave rectified current that includes a plurality of cyclic waves corresponding to a plurality of half cycles of the alternating electric signal, respectively;
generating and outputting a pulse width modulation signal based on a selected motor control target value and one of a counted value, the counted value being based on a state of the initial full wave rectified signal, and a voltage of the initial full wave rectified signal;
and
supplying a pulse width modulated full wave rectified current to the electric motor by controllably interrupting the supply of each of the cyclic waves of the initial full wave rectified current during an entire interval of each of said cyclic waves to the electric motor based on a pulse width modulation signal, so that the electric motor is supplied with an electric current having a substantially constant magnitude during a substantially entire interval of each of said cyclic waves.

1 more element

An apparatus for controllably driving an electric motor powered by an alternating current power supply, the apparatus comprising:

a full wave rectifying circuit which rectifies an alternating current of an alternating electric signal supplied by the alternating current power supply and outputs an initial full wave rectified signal having an initial full wave rectified current that includes a plurality of cyclic waves corresponding to a plurality of half cycles of the alternating electric signal, respectively;
a current supply circuit which applies a pulse width modulated fall wave rectified current to the electric motor by controllably interrupting the supply of each of the cyclic waves of the initial full wave rectified current during an entire interval of each of said cyclic waves to the electric motor based on a pulse width modulation signal, so that the electric motor is supplied with an electric current having a substantially constant magnitude during a substantially entire interval of each of said cyclic waves;
and
a current supply control circuit which generates and outputs the pulse width modulation signal to the current supply circuit, the current supply control circuit generating the pulse width modulation signal based on a selected motor control target value and a voltage of the initial full wave rectified signal.

1 more element

Dependencies are inferred from the claim text.