Disk drive with improved spin-up control
US-2015380045-A1 · Dec 31, 2015 · US
Back electromotive force monitoring circuit, motor drive device, magnetic disk storage device, and electronic appliance
US9178461B2 · US · B2
| Field | Value |
|---|---|
| Publication number | US-9178461-B2 |
| Application number | US-201313894873-A |
| Country | US |
| Kind code | B2 |
| Filing date | May 15, 2013 |
| Priority date | May 15, 2013 |
| Publication date | Nov 3, 2015 |
| Grant date | Nov 3, 2015 |
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Abstract
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A back electromotive force monitoring circuit has a speed detection voltage generator which biases a back electromotive force generated by a voice coil motor with a predetermined reference voltage to generate a speed detection voltage, and a calculator which generates a motor control signal in accordance with the speed detection voltage. The calculator includes a subtracter which subtracts the reference voltage from the speed detection voltage prior to generation of the motor control signal.
First claim
Opening claim text (preview).
What is claimed is: 1. A back electromotive force monitoring circuit comprising: a speed detection voltage generator which biases a back electromotive force generated by a voice coil motor with a predetermined reference voltage to generate a speed detection voltage; and a calculator which generates a motor control signal in accordance with the speed detection voltage, wherein the calculator includes a subtracter which subtracts the reference voltage from the speed detection vo…
Assignees
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Classifications
- G11B19/28Primary
Physics · mapped topic
- H02P25/028Primary
Electricity · mapped topic
Electricity · mapped topic
Physics · mapped topic
Electricity · mapped topic
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- What does patent US9178461B2 cover?
- A back electromotive force monitoring circuit has a speed detection voltage generator which biases a back electromotive force generated by a voice coil motor with a predetermined reference voltage to generate a speed detection voltage, and a calculator which generates a motor control signal in accordance with the speed detection voltage. The calculator includes a subtracter which subtracts the …
- Who is the assignee on this patent?
- Rohm Co Ltd
- What technology area does this patent fall under?
- Primary CPC classification G11B19/28. Mapped technology areas include Physics.
- When was this patent published?
- Publication date Tue Nov 03 2015 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 8 related publications on this page (citations in our corpus or others sharing the same primary CPC).