Author： Hung Chung-Wen
Publisher： Springer Publishing Company
ISSN： 1433-5298
Source： Artificial Life and Robotics, Vol.17, Iss.1, 2012-10, pp. : 80-85
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Abstract
This paper proposes a novel circuit for correcting the errors occurring in the speed measurement of a brushless DC (BLDC) motor with Hall sensors that are built in for commutation. Although the poles of the rotor are always placed with a uniform angular separation, the Hall sensors may not. The angular misalignment between the poles and the Hall sensors will cause errors in the speed measurement. With a method previously proposed to estimate the degree of misalignment, the speed errors can be minimized by our proposed circuit. This circuit is implemented in an FPGA with the aid of a hardware description language and is validated by the simulated results.
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