Controlling a brushless motor
US-12095402-B2 · Sep 17, 2024 · US
Driving apparatus for sensorless fan motor
US9178453B2 · US · B2
| Field | Value |
|---|---|
| Publication number | US-9178453-B2 |
| Application number | US-201314085216-A |
| Country | US |
| Kind code | B2 |
| Filing date | Nov 20, 2013 |
| Priority date | Nov 20, 2012 |
| Publication date | Nov 3, 2015 |
| Grant date | Nov 3, 2015 |
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Abstract
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According to the voltage V U that occurs at one end of at least one of multiple coils of a fan motor, a back electromotive force detection circuit generates a detection signal BEMF U asserted in a cyclic manner when a fan motor is stably rotating. A lock protection circuit detects a lock state of the fan motor rotor. A period detection unit measures the detection signal BEMF U period. A synchronization pulse generating circuit generates a synchronization pulse having a period that is 1/N (N represents an integer of 2 or more) of that of the detection signal BEMF U measured in a previous cycle. A lock judgment unit counts the synchronization pulse in increments of cycles of the detection signal BEMF U . When the count value exceeds a predetermined threshold value M (M represents an integer of 2 or more) which is greater than N, the lock mode judgment signal is asserted.
First claim
Opening claim text (preview).
What is claimed is: 1. A driving apparatus for a sensorless fan motor comprising a plurality of coils, the driving apparatus comprising: a back electromotive force detection circuit configured to compare a voltage that occurs at one end of at least one from among the plurality of coils of the fan motor with a common voltage that occurs at a common connection node at which the plurality of coils are connected together, and to generate, based on a comparison result, a detection sign…
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Frequently asked questions
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- What does patent US9178453B2 cover?
- According to the voltage V U that occurs at one end of at least one of multiple coils of a fan motor, a back electromotive force detection circuit generates a detection signal BEMF U asserted in a cyclic manner when a fan motor is stably rotating. A lock protection circuit detects a lock state of the fan motor rotor. A period detection unit measures the detection signal BEMF U period. A sync…
- Who is the assignee on this patent?
- Rohm Co Ltd
- What technology area does this patent fall under?
- Primary CPC classification H02P6/12. Mapped technology areas include Electricity.
- 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).