| US 7,576,503 B2 | ||
| Brushless motor control apparatus for pump | ||
| Shingo Nakanishi, Obu (Japan); and Masahiro Kako, Toyota (Japan) | ||
| Assigned to Aisan Kogyo Kabushiki Kaisha, Obu (Japan) | ||
| Filed on Nov. 27, 2006, as Appl. No. 11/604,203. | ||
| Claims priority of application No. 2005-360141 (JP), filed on Dec. 14, 2005; and application No. 2006-313811 (JP), filed on Nov. 21, 2006. | ||
| Prior Publication US 2007/0132418 A1, Jun. 14, 2007 | ||
| Int. Cl. H02P 6/00 (2006.01) | ||
| U.S. Cl. 318—400.01 [318/700; 318/400.04; 318/400.06; 318/601; 318/611; 700/75; 700/69] | 24 Claims |
| 1. A brushless motor control apparatus for a pump, the control apparatus being adapted to detect a phase based on an induced
voltage in each phase coil of a brushless motor provided in a pump and control energization of the each phase coil based on
the detected phase:
wherein the control apparatus checks the induced voltage in each phase coil by using a plurality of reference voltages as
judgment values, converts a result of the check into a logic signal in each phase coil, and detects the phase based on a prescribed
change in the logic signal in each phase coil.
|