Motor driving apparatus and controlling method thereof
US-2015123582-A1 · May 7, 2015 · US
Motor drive controller and method for detecting rotation state
US9543866B2 · US · B2
| Field | Value |
|---|---|
| Publication number | US-9543866-B2 |
| Application number | US-201514952170-A |
| Country | US |
| Kind code | B2 |
| Filing date | Nov 25, 2015 |
| Priority date | Nov 28, 2014 |
| Publication date | Jan 10, 2017 |
| Grant date | Jan 10, 2017 |
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Abstract
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A motor drive controller is for controlling a motor having multiple phases and includes: a comparison reference voltage generator that generates a predetermined constant voltage as a comparison reference voltage; a counter-electromotive voltage comparator that compares the comparison reference voltage with a counter-electromotive voltage of each phase of the motor; and a rotation state detector that detects a rotation state of the motor based on positive/negative polarities of counter-electromotive voltages of other phases with respect to the comparison reference voltage at the time of an occurrence of a zero cross between the counter-electromotive voltage of any one phase and the comparison reference voltage.
First claim
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What is claimed is: 1. A motor drive controller for controlling a motor having multiple phases, the motor drive controller comprising: a comparison reference voltage generator that generates a predetermined constant voltage as a comparison reference voltage; a counter-electromotive voltage comparator that compares the comparison reference voltage with a counter-electromotive voltage of each phase of the motor; and a rotation state detector that detects a rotation state of the motor based on positive/negative polarities of counter-electromotive voltages of other phases with respect to the comparison reference voltage at the time of an occurrence of a zero cross between the counter-electromotive voltage of any one phase and the comparison reference voltage, wherein the number of the phase of the motor is three, and wherein the rotation state detector detects that the motor is in forward rotation at a predetermined speed or higher in a case where, when a zero cross between the rise of the counter-electromotive voltage of any one phase and the comparison reference voltage occurs, the counter-electromotive voltage of another phase leading the phase is positive with respect to the comparison reference voltage, and the counter-electromotive voltage of another phase retarding the phase is negative with respect to the comparison reference voltage. 2. The motor drive controller according to claim 1 , wherein the comparison reference voltage generator sets the comparison reference voltage based on an amplitude of the counter-electromotive voltage generated in each phase when the motor rotates at a predetermined speed. 3. A method for detecting rotation state of a three-phase motor, the method comprising: generating a predetermined constant voltage as a comparison reference voltage; comparing the comparison reference voltage with a counter-electromotive voltage of each phase of the motor; detecting a rotation state of the motor based on positive/negative polarities of the counter-electromotive voltages of the other phases with respect to the comparison reference voltage at the time of an occurrence of a zero cross between the counter-electromotive voltage of any one phase and the comparison reference voltage; and detecting that the motor is in forward rotation at a predetermined speed or higher in a case where, when a zero cross between the rise of the counter-electromotive voltage of any one phase and the comparison reference voltage occurs, the counter-electromotive voltage of another phase leading the phase is positive with respect to the comparison reference voltage, and the counter-electromotive voltage of another phase retarding the phase is negative with respect to the comparison reference voltage. 4. A method for detecting rotation state of a three-phase motor, the method comprising: generating a predetermined constant voltage as a comparison reference voltage; comparing the comparison reference voltage with a counter-electromotive voltage of each phase of the motor; detecting a rotation state of the motor based on positive/negative polarities of the counter-electromotive voltages of the other phases with respect to the comparison reference voltage at the time of an occurrence of a zero cross between the counter-electromotive voltage of any one phase and the comparison reference voltage; and detecting that a rotation speed of the motor is less than a predetermined speed in a case where, when a zero cross between the rise of the counter-electromotive voltage of any one phase and the comparison reference voltage occurs, both the counter-electromotive voltage of another phase leading the phase and the counter-electromotive voltage of another phase retarding the phase have a same sign with respect to the comparison reference voltage. 5. A motor drive controller for controlling a motor having multiple phases, the motor drive controller comprising: a comparison reference voltage generator that generates a predetermined constant voltage as a comparison reference voltage; a counter-electromotive voltage comparator that compares the comparison reference voltage with a counter-electromotive voltage of each phase of the motor; and a rotation state detector that detects a rotation state of the motor based on positive/negative polarities of counter-electromotive voltages of other phases with respect to the comparison reference voltage at the time of an occurrence of a zero cross between the counter-electromotive voltage of any one phase and the comparison reference voltage, wherein the number of the phase of the motor is three, and wherein the rotation state detector detects that a rotation speed of the motor is less than a predetermined speed in a case where, when a zero cross between the rise of the counter-electromotive voltage of any one phase and the comparison reference voltage occurs, both the counter-electromotive voltage of another phase leading the phase and the counter-electromotive voltage of another phase retarding the phase have a same sign with respect to the comparison reference voltage. 6. The motor drive controller according to claim 5 , wherein the comparison reference voltage generator sets the comparison reference voltage based on an amplitude of the counter-electromotive voltage generated in each phase when the motor rotates at a predetermined speed.
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- What does patent US9543866B2 cover?
- A motor drive controller is for controlling a motor having multiple phases and includes: a comparison reference voltage generator that generates a predetermined constant voltage as a comparison reference voltage; a counter-electromotive voltage comparator that compares the comparison reference voltage with a counter-electromotive voltage of each phase of the motor; and a rotation state detector…
- Who is the assignee on this patent?
- Minebea Co Ltd
- What technology area does this patent fall under?
- Primary CPC classification H02P6/182. Mapped technology areas include Electricity.
- When was this patent published?
- Publication date Tue Jan 10 2017 00:00:00 GMT+0000 (Coordinated Universal Time) (B2). Legal status and post-grant events are not shown on this page.
- What related patents are in patentsdb?
- We list 1 related publication on this page (citations in our corpus or others sharing the same primary CPC).