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US 6,191,545 B1Granted
Control apparatus of brushless motor and machine and apparatus using brushless motor
AssigneeHitachi, Ltd.
InventorsYukio Kawabata, Yasuo Notohara, Kazuo Tahara
Life of this patent
Estimating the term…
Abstract
A phase signal generation circuit is constituted by using a comparison circuit 10, a delay circuit 11, a gate signal preparation circuit 13, and a selection holding circuit 12. A phase signal generated in the phase signal generation circuit 9 is pattern recognized in a control circuit 6 and a position of a rotor is detected and a PWM control area, PAM control, and a change-over PWM/PAM is carried out. The rotor position detection accuracy can be heightened and a wide control. range can be obtained.
Claims17
A control apparatus for use in a brushless motor comprising:
- voltage detection means for generating a detection voltage in response to a terminal voltage of plural phases of a stator winding of the brushless motor, standard voltage generation means for generating a standard voltage, comparison means for outputting a comparison result information signal by comparing said detection voltage and said standard voltage, control means for detecting a rotation position of a rotor of the brushless motor according to said comparison result information signal and for generating an electric supply control signal for said stator winding in response to said rotation position, and output means for supplying electric power to said stator winding according to said electric supply control signal, wherein
- said control means extracts an “on” period or an “off” period of a PWM (pulse width modulation) signal according to said comparison result information signal.
A control apparatus for use in a brushless motor comprising:
- voltage detection means for generating a detection voltage in response to a terminal voltage of plural phases of a stator winding of the brushless motor, standard voltage generation means for generating a standard voltage, comparison means for outputting a comparison result information signal by comparing said detection voltage and said standard voltage, selection holding means for selecting whether said comparison result information signal from said comparison means is to be output as a phase signal or whether a previous level of the comparison result information signal from said comparison means is to be output as a phase signal, control means for detecting a rotation position of a rotor of the brushless motor according to said comparison result information signal and for generating an electric supply control signal for said stator winding in response to said rotation position, and output means for supplying electric power to said stator winding according to said electric supply control signal, wherein
- said selection holding means operates to output, when a PWM (pulse width modulation) signal is in an “on” condition, said comparison information signal from said comparison means as said phase signal as it is, and, when said PWM (pulse width modulation) signal changes to an “off” condition, continues to output the level of the condition comparison result information signal which occurred immediately before the “off” condition as said phase signal.
A control apparatus for use in a brushless motor comprising:
- a rectifying circuit for converting an alternating current power source voltage to a direct current voltage, an inverter circuit for converting said direct current voltage to an alternating current voltage and for supplying said alternating current voltage to the brushless motor, a control circuit for controlling said inverter circuit, wherein the control apparatus for use in the brushless motor comprises:
- a voltage detection means for generating a detection voltage in response to a terminal voltage of plural phases of a stator winding of the brushless motor, standard voltage generation means for generating a standard voltage, comparison means for outputting a comparison result information signal by comparing said detection voltage and said standard voltage, selection holding means for selecting whether said comparison result information signal from said comparison means is to be output as a phase signal or whether the previous level of said comparison result information signal from said comparison means is to be output as said phase signal, control means for detecting a rotation position of a rotor of the brushless motor according to said comparison result information signal and for generating an electric supply control signal for said stator winding in response to said rotation position, and output means for supplying electric power to said stator winding according to said electric supply control signal, and wherein
- said selection holding means operates to output, when a PWM (pulse width modulation) signal is in an “on” condition, said comparison information signal from said comparison means as said phase signal as it is, and, when said PWM (pulse width modulation) signal changes to an “off” condition, continues to output the level of the condition comparison result information signal which occurred immediately before the “off” condition as said phase signal.
A control apparatus for use in a brushless motor comprising:
- a converter circuit having a rectifying circuit for converting an alternating current power source voltage to a direct current voltage and a chopper circuit for controlling the level of said direct current voltage, an inverter circuit for converting said direct current voltage which is received from said inverter circuit to an alternating current voltage and for supplying said alternating current voltage to the brushless motor, a converter control circuit for controlling a switching operation of said inverter circuit, an inverter control circuit for driving the brushless motor by controlling a switching operation of said inverter circuit, a control circuit for controlling said converter control circuit and said inverter control circuit, wherein the control apparatus for use in the bushless motor comprises:
- a voltage detection means for generating a detection voltage in response to a terminal voltage of plural phases of a stator winding of the brushless motor, standard voltage generation means for generating a standard voltage, comparison means for outputting a comparison result information signal by comparing said detection voltage and said standard voltage, selection holding means for selecting whether said comparison result information signal from said comparison means is to be output as a phase signal or whether the previous level of said comparison result information signal from said comparison means is to be output as said phase signal, control means for detecting a rotation position of a rotor of the brushless motor according to said comparison result information signal and for generating an electric supply control signal for said stator winding in response to said rotation position, and output means for supplying electric power to said stator winding according to said electric supply control signal, and wherein
- said selection holding means operates the output, when a PWM (pulse width modulation) signal is an “on” condition, said comparison information signal from said comparison means as said phase signal as it is, and, when said PWM (pulse width modulation) signal changes to an “off” condition, continues to output the level of the condition comparison result information signal which occurred immediately before the “off” condition as said phase signal.
A control apparatus for use in a brushless motor comprising:
- voltage detection means for generating a detection voltage in response to a terminal voltage of plural phases of a stator winding of the brushless motor, standard voltage generation means for generating a standard voltage, comparison means for outputting a comparison result information signal by comparing said detection voltage and said standard voltage, control means for detecting a rotation position of a rotor of the brushless motor according to said comparison result information signal which is outputted from said comparison means and for outputting an electric supply control signal, and output means for supplying electric power to said stator winding according to said electric supply control signal, wherein
- said control means detects a position of said rotor according to a pattern of plural phase comparison result information signals.
A control apparatus for use in a brushless motor comprising:
- voltage detection means for generating a detection voltage in response to a terminal voltage of plural phases of a stator winding of the brushless motor, standard voltage generation means for generating a standard voltage, comparison means for outputting a comparison result information signal by comparing said detection voltage and said standard voltage, control means for detecting a rotation position of a rotor of the brushless motor according to said comparison result information signal which is outputted from said comparison means and for outputting an electric supply control signal, and output means for supplying electric power to said stator winding according to said electric supply control signal, wherein
- said control means determines a pattern of electric supply to said stator winding according to a pattern of plural phase comparison result information signals.
A control apparatus for use in a brushless motor comprising:
- voltage detection means for generating a detection voltage in response to a terminal voltage of plural phases of a stator winding of the brushless motor, standard voltage generation means for generating a standard voltage, comparison means for outputting a comparison result information signal by comparing said detection voltage and said standard voltage, control means for detecting a rotation position of a rotor of the brushless motor according to said comparison result information signal and for generating an electric supply control signal for said stator winding in response to said rotation position, and output means for supplying electric power to said stator winding according to said electric supply control signal, wherein
- said control means detects a period in which a return current flows after an electric supply change-over according to a pattern of said comparison result information signal.
A control apparatus for use in a brushless motor comprising:
- voltage detection means for generating a detection voltage in response to a terminal voltage of plural phases of a stator winding of the brushless motor, standard voltage generation means for generating a standard voltage, comparison means for outputting a comparison result information signal by comparing said detection voltage and said standard voltage, control means for detecting a rotation position of a rotor of the brushless motor according to a pattern of a phase signal by obtaining said phase signal according to said comparison result information signal which is outputted from said comparison means and for outputting an electric supply control signal, and output means for supplying electric power to said stator winding according to said electric supply control signal, wherein
- after a return current after an electric supply change-over vanishes, a processing is carried out for renewing a phase signal pattern which is correlated to carry out a position detection.
A control apparatus for use in a brushless motor comprising:
- voltage detection means for generating a detection voltage in response to a terminal voltage of plural phases of a stator winding of the brushless motor, standard voltage generation means for generating a standard voltage, comparison means for outputting a comparison result information signal by comparing said detection voltage and said standard voltage, control means for detecting a rotation position of a rotor of the brushless motor according to said comparison result information signal and for generating an electric supply control signal for said stator winding in response to said rotation position, and output means for supplying electric power to said stator winding according to said electric supply control signal, wherein
- said control means detects a rotor position according to a pattern of said comparison result information signal and changes over an electric supply phase according to electric supply information which is stored in a memory.
A control apparatus for use in a brushless motor comprising:
- voltage detection means for generating a detection voltage in response to a terminal voltage of plural phases of a stator winding of the brushless motor, standard voltage generation means for generating a standard voltage, comparison means for outputting a comparison result information signal by comparing said detection voltage and said standard voltage, control means for detecting a rotation position of a rotor of the brushless motor according to said comparison result information signal and for generating an electric supply control signal for said stator winding in response to said rotation position, and an output means for supplying electric power to said stator winding according to said electric supply control signal, wherein
- said control means detects a rotor position according to a pattern of said comparison result information signal and changes over an electric supply phase according to a phase control command from an outside source.
A control apparatus for use in a brushless motor comprising:
- voltage detection means for generating a detection voltage in response to a terminal voltage of plural phases of a stator winding of the brushless motor, standard voltage generation means for generating a standard voltage, comparison means for outputting a comparison result information signal by comparing said detection voltage and said standard voltage, control means for detecting a rotation position of a rotor of the brushless motor according to said comparison result information signal and for generating an electric supply control signal for said stator winding in response to said rotation position, and an output means for electric power to said stator winding according to said electric supply control signal, wherein
- said control means carries out a phase control in an operation efficiency importance in a PWM (pulse width modulation) control area and carries out control for proceeding an electric phase in a high rotation importance control area.
Dependencies are inferred from the claim text.