Motor driving device and motor driving method
First Claim
1. A motor driving device for driving a motor by energizing motor coils with PWM control, the motor driving device comprising:
- an energization switching section for determining a first energized phase and a second energized phase to be PWM-controlled, the determination being made at a predetermined cycle;
a torque command signal generation section that receives an original torque command signal for producing a first torque command signal and a second torque command signal each having an amplitude according to the original torque command signal;
a comparison section that receives the first and second torque command signals and a current detection signal, which is obtained by detecting a current being supplied to the motor, for comparing the current detection signal with the first and second torque command signals to output a first comparison result and a second comparison result, respectively;
an oscillation section for producing a first set pulse signal and a second set pulse signal; and
a PWM control section that receives the first and second set pulse signals and the first and second comparison results for producing a first PWM control signal according to the first set pulse signal and the first comparison result and producing a second PWM control signal according to the second set pulse signal and the second comparison result, wherein the first and second energized phases, which are determined by the energization switching section, are energized with PWM control in parallel according respectively to the first and second PWM control signals, which are produced by the PWM control section.
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Accused Products
Abstract
In a PWM-controlled motor driving device, a phase current is prevented from undergoing an abrupt transition at phase current switching points, thereby reducing vibrations and noise of the motor. A PWM control section produces two independent PWM control pulse signals P1 and P2. Two energized phases, which are determined by an energization switching section, are energized with PWM control in parallel according to the PWM control pulse signals P1 and P2. A comparison section compares a current detection signal DS, which indicates the level of the current flowing through a motor coil, with various torque command signals TQ1, TQ2 and TQ3, which are produced by a torque command signal generation section. A masking section masks comparison results CR1 and CR2 as necessary. Thus, an ON period of the PWM control pulse signal P1 and that of the PWM control pulse signal P2 are determined. In this way, phase current switching can be done smoothly with any torque from a low torque to a high torque, thereby preventing an abrupt phase current transition.
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Citations
22 Claims
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1. A motor driving device for driving a motor by energizing motor coils with PWM control, the motor driving device comprising:
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an energization switching section for determining a first energized phase and a second energized phase to be PWM-controlled, the determination being made at a predetermined cycle;
a torque command signal generation section that receives an original torque command signal for producing a first torque command signal and a second torque command signal each having an amplitude according to the original torque command signal;
a comparison section that receives the first and second torque command signals and a current detection signal, which is obtained by detecting a current being supplied to the motor, for comparing the current detection signal with the first and second torque command signals to output a first comparison result and a second comparison result, respectively;
an oscillation section for producing a first set pulse signal and a second set pulse signal; and
a PWM control section that receives the first and second set pulse signals and the first and second comparison results for producing a first PWM control signal according to the first set pulse signal and the first comparison result and producing a second PWM control signal according to the second set pulse signal and the second comparison result, wherein the first and second energized phases, which are determined by the energization switching section, are energized with PWM control in parallel according respectively to the first and second PWM control signals, which are produced by the PWM control section. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13, 14, 15, 16, 17, 18)
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19. A motor driving method for driving a motor by energizing motor coils with PWM control, the motor driving method comprising:
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an energization switching step of determining a first energized phase and a second energized phase to be PWM-controlled, the determination being made at a predetermined cycle;
a torque command signal generation step of producing a first torque command signal and a second torque command signal each having an amplitude according to a given original torque command signal;
a comparison step of comparing a current detection signal, which is obtained by detecting a current being supplied to the motor, with each of the first and second torque command signals; and
a PWM control step of producing a first PWM control signal and a second PWM control signal according to a first set pulse signal, a second set pulse signal and comparison results from the comparison step, wherein the first and second energized phases, which are determined by the energization switching step, are energized with PWM control in parallel according respectively to the first and second PWM control signals, which are produced by the PWM control step. - View Dependent Claims (20, 21, 22)
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Specification