US8933653B2 · US · B2
| Field | Value |
|---|---|
| Publication number | US-8933653-B2 |
| Application number | US-201213633325-A |
| Country | US |
| Kind code | B2 |
| Filing date | Oct 2, 2012 |
| Priority date | Oct 3, 2011 |
| Publication date | Jan 13, 2015 |
| Grant date | Jan 13, 2015 |
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Official abstract text for this publication.
A motor current detection apparatus in the present invention includes: a current detection unit, a first filter, and a second filter. The detection unit detects a conduction current flowing from a battery to a brushless motor and outputs a conduction current signal corresponding to the detected conduction current. The first filter extracts a first current signal which is included in the conduction current signal outputted from the detection unit and is a signal component in a frequency band equal to or lower than a predetermined first cutoff frequency. The second filter extracts a second current signal which is included in the conduction current signal outputted from the detection unit and is a signal component in a predetermined frequency band within a frequency band equal to or lower than a predetermined second cutoff frequency higher than the first cutoff frequency and having the second cutoff frequency as a maximum value.
Opening claim text (preview).
What is claimed is: 1. A motor current detection apparatus comprising: a current detection unit configured to detect a conduction current flowing from a battery to a brushless motor and output a conduction current signal corresponding to the detected conduction current; a first filter configured to extract a first current signal which is included in the conduction current signal outputted from the current detection unit and is a signal component in a frequency band equal to or l…
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