Apparatus for controlling brushless motor and method for controlling brushless motor
First Claim
1. A brushless motor control apparatus comprising:
- an inverter circuit that applies a drive voltage to a winding of each phase of a brushless motor;
a rotor magnetic pole detector that outputs a magnetic pole detection signal corresponding to a rotor position of the brushless motor based on a change of a magnetic pole detected by a Hall sensor;
a rotor position estimator that outputs, each time a level of the magnetic pole detection signal is switched, an estimated rotor position signal that indicates an estimated rotor position with an electrical angle and indicates a predetermined electrical angle corresponding to the level after switching;
a current detector that detects a current supplied to the inverter circuit as a power source current value; and
an electrical angle correction unit that corrects the estimated rotor position signal by determining an electrical angle offset based on fluctuation in the power source current value and adding the electrical angle offset to the electrical angle indicated by the estimated rotor position signal.
1 Assignment
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Accused Products
Abstract
A brushless motor control apparatus includes an inverter circuit that applies a drive voltage to a winding of each phase of a brushless motor, a rotor magnetic pole detector that outputs a magnetic pole detection signal corresponding to a rotor position of the brushless motor based on a change of a magnetic pole detected by a Hall sensor, a rotor position estimator that outputs, each time a level of the magnetic pole detection signal is switched, an estimated rotor position signal that indicates an estimated rotor position with an electrical angle and indicates a predetermined electrical angle corresponding to the level after switching, a current detector that detects a current supplied to the inverter circuit as a power source current value, and an electrical angle correction unit that corrects the estimated rotor position signal by determining an electrical angle offset based on fluctuation in the power source current value and adding the electrical angle offset to the electrical angle indicated by the estimated rotor position signal.
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Citations
6 Claims
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1. A brushless motor control apparatus comprising:
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an inverter circuit that applies a drive voltage to a winding of each phase of a brushless motor; a rotor magnetic pole detector that outputs a magnetic pole detection signal corresponding to a rotor position of the brushless motor based on a change of a magnetic pole detected by a Hall sensor; a rotor position estimator that outputs, each time a level of the magnetic pole detection signal is switched, an estimated rotor position signal that indicates an estimated rotor position with an electrical angle and indicates a predetermined electrical angle corresponding to the level after switching; a current detector that detects a current supplied to the inverter circuit as a power source current value; and an electrical angle correction unit that corrects the estimated rotor position signal by determining an electrical angle offset based on fluctuation in the power source current value and adding the electrical angle offset to the electrical angle indicated by the estimated rotor position signal. - View Dependent Claims (2, 3, 4, 5)
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6. A brushless motor control method that uses an inverter circuit that applies a drive voltage to a winding of each phase of a brushless motor, the brushless motor control method comprising:
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outputting a magnetic pole detection signal corresponding to a rotor position of the brushless motor based on a change of a magnetic pole detected by a Hall sensor; outputting, each time a level of the magnetic pole detection signal is switched, an estimated rotor position signal that indicates an estimated rotor position with an electrical angle and indicates a predetermined electrical angle corresponding to the level after switching; detecting a current supplied to the inverter circuit as a power source current value; determining an electrical angle offset based on fluctuation in the power source current value; and correcting the estimated rotor position signal by adding the electrical angle offset to the electrical angle indicated by the estimated rotor position signal.
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Specification