Control device for controlling an operating device
US-9221358-B2 · Dec 29, 2015 · US
Position estimation device, motor drive control device, and position estimation method
US2016011009A1 · US · A1
| Field | Value |
|---|---|
| Publication number | US-2016011009-A1 |
| Application number | US-201514719477-A |
| Country | US |
| Kind code | A1 |
| Filing date | May 22, 2015 |
| Priority date | Jul 14, 2014 |
| Publication date | Jan 14, 2016 |
| Grant date | — |
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Abstract
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A position estimation device that estimates a position of a rotor of a motor, includes a current detection unit detecting a coil current as a first detection current, the coil current being generated in accordance with a signal where a control signal, which controls a drive current that rotationally drives the motor; and a harmonic wave signal that are superimposed on each other. The device further detects a harmonic wave current, which is a response of the harmonic wave signal, as a second detection current; and has a position estimation unit estimating the position of the rotor of the motor based on the second detection current.
First claim
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What is claimed is: 1 . A position estimation device that estimates a position of a rotor of a motor, comprising: a current detection unit configured to detect a coil current as a first detection current, the coil current being generated in accordance with a signal where a control signal, which controls a drive current that rotationally drives the motor, and a harmonic wave signal are superimposed on each other, and further detect a harmonic wave current, which is a response of the harmonic wave signal, as a second detection current; and a position estimation unit configured to estimate the position of the rotor of the motor based on the second detection current. 2 . The position estimation device according to claim 1 , wherein the current detection unit includes a filter that attenuates a frequency of the drive current and passes a frequency of the harmonic wave current and is configured to detect the second detection current by using the filter. 3 . The position estimation device according to claim 2 , wherein a gain of a passband of the filter is greater than one. 4 . The position estimation device according to claim 1 , wherein the current detection unit includes an AD converter that converts the coil current and the harmonic wave current into digital values and outputs the digital values. 5 . The position estimation device according to claim 1 , wherein the harmonic wave signal is a sine wave. 6 . The position estimation device according to claim 1 , wherein the harmonic wave signal is a rectangular wave. 7 . A motor drive control device that controls driving of a motor in accordance with a position of a rotor of the motor, comprising: a current detection unit configured to detect a coil current as a first detection current, the coil current being generated in accordance with a signal where a control signal, which controls a drive current that rotationally drives the motor, and a harmonic wave signal are superimposed on each other, and further detect a harmonic wave current, which is a response of the harmonic wave signal, as a second detection current; and a position estimation unit configured to estimate the position of the rotor of the motor based on the second detection current. 8 . An position estimation method of estimating a position of a rotor of a motor, comprising: a current detection step of detecting a coil current as a first detection current, the coil current being generated in accordance with a signal where a control signal, which controls a drive current that rotationally drives the motor, and a harmonic wave signal are superimposed on each other, and further detecting a harmonic wave current, which is a response of the harmonic wave signal, as a second detection current; and a position estimation step of estimating the position of the rotor of the motor based on the second detection current.
Assignees
Inventors
Classifications
- G01D5/12Primary
using electric or magnetic means (G01D5/06 takes precedence) · CPC title
- G01R19/0092Primary
Measuring current only · CPC title
- H02P6/183Primary
using an injected high frequency signal · CPC title
Estimation of position or speed · CPC title
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- What does patent US2016011009A1 cover?
- A position estimation device that estimates a position of a rotor of a motor, includes a current detection unit detecting a coil current as a first detection current, the coil current being generated in accordance with a signal where a control signal, which controls a drive current that rotationally drives the motor; and a harmonic wave signal that are superimposed on each other. The device fur…
- Who is the assignee on this patent?
- Shimizu Fumihiro, Yamamoto Norihiro, Muranaka Masayuki, and 1 more
- What technology area does this patent fall under?
- Primary CPC classification G01D5/12. Mapped technology areas include Physics.
- When was this patent published?
- Publication date Thu Jan 14 2016 00:00:00 GMT+0000 (Coordinated Universal Time) (A1). Legal status and post-grant events are not shown on this page.
- What related patents are in patentsdb?
- We list 8 related publications on this page (citations in our corpus or others sharing the same primary CPC).