MOTOR CONTROLLER, SENSORLESS BRUSHLESS MOTOR, FAN, AND MOTOR CONTROL METHOD
1 Assignment
0 Petitions
Accused Products
Abstract
A motor controller includes an energization pattern determiner that determines an energization pattern that specifies a coil to be energized from coils of multiple phases and a current supply that supplies a current to the coil based on the energization pattern. The energization pattern determiner includes, assuming that an energization period is a time from determination of the energization pattern to determination of the next energization pattern, a first operation mode in which the energization period is determined based on a rotation speed of the rotor, and a second operation mode in which the energization period is longer than in the first operation mode. At the start of activation, the energization pattern determiner passes through multiple energization periods in the second operation mode, and then shifts to the first operation mode.
-
Citations
20 Claims
-
1-10. -10. (canceled)
-
11. A motor controller that controls rotation of a sensorless brushless motor including a rotor that includes a magnet including magnetic poles, and a stator that includes coils of a plurality of phases, the motor controller comprising:
-
an energization pattern determiner that determines an energization pattern that specifies a coil to be energized from the coils of a plurality of phases; and a current supply that supplies a current to the coil based on the energization pattern;
whereinassuming that an energization period is a time from determination of the energization pattern to determination of a next energization pattern, the energization pattern determiner includes; a first operation mode in which the energization period is determined based on a rotation speed of the rotor; and a second operation mode in which the energization period is longer than in the first operation mode; and at a start of activation of the sensorless brushless motor, the energization pattern determiner passes through a plurality of energization periods in the second operation mode, and then shifts to the first operation mode. - View Dependent Claims (12, 13, 14, 15, 16)
-
-
17. A motor control method of controlling rotation of a rotor of a sensorless brushless motor including coils of a plurality of phases, the motor control method comprising the steps of:
-
after determining an energization pattern that specifies a coil to be energized from the coils of a plurality of phases, supplying a current to the coil based on the energization pattern; determining the energization pattern in any one of a plurality of operation modes including; assuming that an energization period is a time from determination of the energization pattern to determination of a next energization pattern, a first operation mode in which the energization period is determined based on a rotation speed of the rotor; and a second operation mode in which the energization period is longer than in the first operation mode; and at a start of activation of the sensorless brushless motor, determining the energization pattern in the second operation mode in a plurality of the energization periods and then shifting to the first operation mode. - View Dependent Claims (18, 19, 20)
-
Specification