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US 9,871,475 B2Granted
PWM motor drive device
AssigneePanasonic Intellectual Property Management Co., Ltd.
InventorsKatsuyuki Tabata, Tomokazu Furuno, Masayoshi Igarashi, Shinichi Kuroshima
Life of this patent
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Abstract
A PWM motor drive device includes: a time counter that counts a time of a polarity of a motor phase signal; a register that retains the time; a zone setting circuit that splits the time into arbitrary zones and generates an arbitrary zone set for which a phase of motor current is adjusted; and a zone correction circuit that compares a motor current phase signal indicating the phase of the motor current with the motor phase signal to correct the zone set.
Claims6
A pulse width modulation (PWM) motor drive device comprising:
- a time counter that counts a time of a polarity of a motor phase signal;
- a register that retains the time;
- a zone setting circuit that splits the time into arbitrary zones, allocates split steps to the arbitrary zones, and generates an arbitrary zone set for which a phase of motor current is corrected;
- a zone correction circuit that compares a motor current phase signal indicating the phase of the motor current with the motor phase signal to correct the zone set;
- a frequency dividing circuit that generates a clock signal to be used in the time counter and the zone setting circuit;
- and
- an H-bridge control circuit that PWM-drives a motor,
- the zone correction circuit correcting a number of steps in each of the arbitrary zones that has been set from the steps split by the zone setting circuit, and generating a zone correction signal.
5 more elements
Dependencies are inferred from the claim text.