DC MOTOR CONTROL OVER WIDE DYNAMIC RANGE
First Claim
1. A system for control of direct current (DC) motors, comprising:
- a power drive coupled to a brushless DC motor; and
a micro control unit (MCU) configured to control commutation of the brushless DC motor based upon shaft speed of the brushless DC motor, where the MCU transitions between a motion-based commutation mode and a time-based commutation mode in response to a comparison of the shaft speed with a predefined threshold.
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Abstract
Various examples are provided for brushless direct current (DC) motor control over a wide dynamic range. In one example, among others, a system including a power drive coupled to a DC motor and a MCU configured to control commutation of the DC motor based upon shaft speed of the DC motor, where the MCU transitions between a motion-based commutation mode and a time-based commutation mode in response to a comparison of the shaft speed with a predefined threshold. In another example, a method includes commutating a DC motor in response to a transition in rotor position of the DC motor and transitioning from a motion-based commutation mode to a time-based commutation mode in response to a comparison of shaft speed of the DC motor to a predefined threshold.
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Citations
20 Claims
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1. A system for control of direct current (DC) motors, comprising:
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a power drive coupled to a brushless DC motor; and a micro control unit (MCU) configured to control commutation of the brushless DC motor based upon shaft speed of the brushless DC motor, where the MCU transitions between a motion-based commutation mode and a time-based commutation mode in response to a comparison of the shaft speed with a predefined threshold. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13)
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14. A method, comprising:
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commutating, in a motion-based commutation mode, a brushless DC motor by switching a power drive coupled to the brushless DC motor in response to a transition in rotor position of the brushless DC motor; comparing a shaft speed of the brushless DC motor to a predefined threshold; and transitioning to a time-based commutation mode in response to the comparison. - View Dependent Claims (15, 16, 17, 18, 19, 20)
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Specification