| US 7,576,511 B2 | ||
| Motor control device and motor control method | ||
| Hisayoshi Takahashi, Utsunomiya (Japan); Tetsu Sugiyama, Utsunomiya (Japan); and Shintaro Uchida, Karasuyama (Japan) | ||
| Assigned to Honda Motor Co., Ltd., Tokyo (Japan) | ||
| Filed on Feb. 12, 2007, as Appl. No. 11/704,971. | ||
| Claims priority of application No. 2006-042175 (JP), filed on Feb. 20, 2006. | ||
| Prior Publication US 2007/0205743 A1, Sep. 06, 2007 | ||
| Int. Cl. H02P 27/04 (2006.01) | ||
| U.S. Cl. 318—807 [318/268; 318/717; 318/767] | 5 Claims |
| 1. A motor control device comprising:
current sensors which detect currents in each phase of a three-phase motor;
a coordinate conversion device which computes a d-axis actual current and a q-axis actual current in dq-coordinates from phase
currents of three phases based on detection values of the current sensors;
a voltage instruction computation device which computes a d-axis voltage instruction and a q-axis voltage instruction based
on a deviation between a d-axis current instruction and the d-axis actual current and on a deviation between a q-axis current
instruction and the q-axis actual current;
a target phase current computation device which computes target phase currents for each phase from the d-axis current instruction
and the q-axis current instruction; and
a current difference computation device which computes, for each phase, a current difference between the phase current and
the target phase current, wherein
the coordinate conversion device computes the d-axis actual current and the q-axis actual current from the phase currents
for the two phases excluding the phase corresponding to the largest of the current differences among the current differences
of the three phases.
|