| US 7,615,947 B2 | ||
| Motor driving device and motor braking method | ||
| Shuji Tamaoka, Kyoto (Japan) | ||
| Assigned to Panasonic Corporation, Osaka (Japan) | ||
| Filed on Jul. 11, 2007, as Appl. No. 11/822,904. | ||
| Prior Publication US 2008/0048597 A1, Feb. 28, 2008 | ||
| Int. Cl. H02P 6/24 (2006.01) | ||
| U.S. Cl. 318—362 [318/365; 318/261; 318/273; 318/703; 318/445; 388/932] | 9 Claims |
| 1. A motor driving device for driving a motor according to a drive signal generated with one cycle delay from a rotation signal
representing detected rotation of the motor, the device comprising:
a brake mode control section for starting, when receiving a brake instruction for the motor, braking of the motor in a reverse
brake mode and then switching the reverse brake mode to a short brake mode;
a cycle start detection section for receiving the rotation signal and detecting a start of a cycle of the rotation signal
for each cycle; and
a counter for performing, when the start of the cycle of the rotation signal is detected by the cycle start detection section,
a count operation from an initial value,
wherein the brake mode control section detects that a value of the counter exceeds a threshold and performs switching from
the reverse brake mode to the short brake mode with a delay from the detection.
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