Device and method of driving BLDC motor and increasing driving speed of BLDC motor
First Claim
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1. A device to drive a brushless DC (BLDC) motor, the device comprising:
- a rectifier converting an AC voltage into a DC voltage;
an inverter converting the DC voltage into an AC voltage by switching a plurality of power switches and supplying the converted AC voltage to the BLDC motor; and
a microcomputer detecting a position of a rotor before a terminal voltage of the BLDC motor exceeds ½
of an output voltage of the rectifier and performing phase switching, when a driving speed of the BLDC motor reaches a rated speed.
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Abstract
Disclosed herein are a device and method of driving a brushless DC (BLDC) motor. The device to drive the BLDC motor includes a rectifier which converts an AC voltage into a DC voltage; an inverter which converts the DC voltage into an AC voltage by switching a plurality of power switches and supplies the converted AC voltage to the BLDC motor; and a microcomputer which detects a position of a rotor before a terminal voltage of the BLDC motor exceeds 1/2 of an output voltage of the rectifier and performs phase switching, when a driving speed of the BLDC motor reaches a rated speed.
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Citations
12 Claims
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1. A device to drive a brushless DC (BLDC) motor, the device comprising:
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a rectifier converting an AC voltage into a DC voltage; an inverter converting the DC voltage into an AC voltage by switching a plurality of power switches and supplying the converted AC voltage to the BLDC motor; and a microcomputer detecting a position of a rotor before a terminal voltage of the BLDC motor exceeds ½
of an output voltage of the rectifier and performing phase switching, when a driving speed of the BLDC motor reaches a rated speed. - View Dependent Claims (2, 3, 4, 10)
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5. A device to drive a brushless DC (BLDC) motor, the device comprising:
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a rectifier converting an AC voltage into a DC voltage; an inverter converting the DC voltage into an AC voltage and supplying the AC voltage to the BLDC motor; and a microcomputer having a position detecting unit detecting a position of a rotor of the BLDC motor by detecting a time point when a terminal voltage is ½
of an output voltage of the rectifier, when a driving speed of the BLDC motor is less than a rated speed, and by detecting any time point of a period when the terminal voltage is in a range from 0 to ½
of the output voltage of the rectifier, when the driving speed of the BLDC motor is greater than or equal to the rated speed. - View Dependent Claims (6)
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7. A device to driving a brushless DC (BLDC) motor, the device comprising:
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a rectifier converting an AC voltage into a DC voltage; an inverter converting the DC voltage into an AC voltage by switching a plurality of power switches and supplying the converted AC voltage to the BLDC motor; and a microcomputer detecting a position of a rotor and performing phase switching before a terminal voltage of the BLDC motor exceeds ½
of an output voltage of the rectifier when the BLDC motor is driven.
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8. A method of driving a brushless DC (BLDC) motor, the method comprising:
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checking a driving speed of the BLDC motor; and detecting a position of a rotor and performing phase switching before a terminal voltage of the BLDC motor exceeds ½
of an output voltage of a rectifier, when the driving speed reaches a rated speed. - View Dependent Claims (9, 11, 12)
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Specification