Brushless motor control method
First Claim
1. A method of controlling a brushless motor comprising a stator having a multiphase armature coil, a rotor having a permanent magnet and arranged rotatably at the outside or inside of said stator, a first sensor group of a plurality of magnetic detection elements and a second sensor group having at least a magnetic detection element separated from said magnetic detection elements of said first sensor group by a predetermined gap, the method comprising:
- forming a plurality of energization stages corresponding to respective rotary positions of said rotor by means of said first sensor group and said second sensor group and defining a torque constant for each of said energization stages; and
computationally determining a target electric current value for each of said energization stages on the basis of said torque constant and the target torque of each stage and supplying power to said armature coil on the basis of said target electric current value.
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Accused Products
Abstract
Energization stages are formed by first and second sensor groups and a torque constant is defined for each of the stages. A target current value is computationally determined so as to drive a motor under control. As a torque command showing a target torque of the motor is input to the controller, the target current value is computationally determined for each stage according to a torque constant map, which provides a table of torque constants for different phases and different stages. The rotor angle of the motor is detected by Hall sensors and the current stage is computationally determined on the basis of the detected rotor angle. Then, a target current value is defined as a function of the target torque for each stage on the basis of the current stage and the motor is driven by the driver under PID control based on the target current value.
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Citations
12 Claims
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1. A method of controlling a brushless motor comprising a stator having a multiphase armature coil, a rotor having a permanent magnet and arranged rotatably at the outside or inside of said stator, a first sensor group of a plurality of magnetic detection elements and a second sensor group having at least a magnetic detection element separated from said magnetic detection elements of said first sensor group by a predetermined gap, the method comprising:
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forming a plurality of energization stages corresponding to respective rotary positions of said rotor by means of said first sensor group and said second sensor group and defining a torque constant for each of said energization stages; and
computationally determining a target electric current value for each of said energization stages on the basis of said torque constant and the target torque of each stage and supplying power to said armature coil on the basis of said target electric current value. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12)
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Specification