MOTOR DRIVING CIRCUIT, MOTOR DRIVING METHOD AND MOTOR DEVICE USING THE SAME
First Claim
1. A motor driving circuit for driving a brushless motor with a sine wave driving mode in a continuous running phase, the brushless motor comprising a stator with a plurality of windings, a rotor and a plurality of position sensors configured to output different magnetic pole detection signals according to positions of the rotor, the positions of the rotor relative to the stator in the circumferential direction being divided into a plurality of sectors, the motor driving circuit comprising:
- a rotor position identifying module configured to identify a sector k in which the rotor is currently located in and an initial electrical angle θ
k corresponding uniquely to the sector k;
a speed calculation module configured to obtain an expected ω
k of the rotor in the sector k by calculating the average speed of one or more sectors previous to the sector k; and
a calculation/control module configured to;
1) determine a real-time electrical angle θ
of the rotor in the current sector based on the expected ω
k and the initial electrical angle θ
k;
2) determine a real-time equivalent voltage to be output to the windings according to a predetermined modulation strategy for sinusoidal modulated output voltage and the real-time electrical angle θ
; and
3) obtain a corresponding pulse modulation driving signal according to the determined real-time equivalent voltage.
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Accused Products
Abstract
A motor driving circuit for driving a brushless motor with a sine wave driving mode in a continuous running phase is provided. The motor driving circuit includes a rotor position identifying module configured to identify a sector k in which a rotor of the brushless motor is currently located and an initial electrical angle θk of the sector k, a speed calculation module configured to obtain an expected ωk of the rotor in the sector k by calculating the average speed of one or more sectors previous to the sector k; and a calculation/control module configured to determine a real-time electrical angle θ, determine a real-time equivalent voltage, and obtain a corresponding pulse modulation driving signal.
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Citations
11 Claims
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1. A motor driving circuit for driving a brushless motor with a sine wave driving mode in a continuous running phase, the brushless motor comprising a stator with a plurality of windings, a rotor and a plurality of position sensors configured to output different magnetic pole detection signals according to positions of the rotor, the positions of the rotor relative to the stator in the circumferential direction being divided into a plurality of sectors, the motor driving circuit comprising:
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a rotor position identifying module configured to identify a sector k in which the rotor is currently located in and an initial electrical angle θ
k corresponding uniquely to the sector k;a speed calculation module configured to obtain an expected ω
k of the rotor in the sector k by calculating the average speed of one or more sectors previous to the sector k; anda calculation/control module configured to;
1) determine a real-time electrical angle θ
of the rotor in the current sector based on the expected ω
k and the initial electrical angle θ
k;
2) determine a real-time equivalent voltage to be output to the windings according to a predetermined modulation strategy for sinusoidal modulated output voltage and the real-time electrical angle θ
; and
3) obtain a corresponding pulse modulation driving signal according to the determined real-time equivalent voltage. - View Dependent Claims (2, 3, 4, 5, 6, 7)
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8. A motor driving method for driving a brushless motor, comprising:
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identifying the current sector, in which a rotor of the brushless motor is located, and the initial electrical angle θ
k corresponding to the current sector, according to magnetic pole detection signals;obtaining an expected θ
k of the rotor in the current sector by calculating the average speed of one or more sectors previous to the current sector;determining a real-time electrical angle θ
of the rotor in the current sector based on the expected tok and the initial electrical angle θ
k ;determining a modulation strategy for sinusoidal modulated output voltage; determining a real-time equivalent voltage according to the modulation strategy and obtaining a corresponding pulse modulation driving signal according to the determined real-time equivalent voltage. - View Dependent Claims (9, 10, 11)
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Specification