Sensorless brushless motor

Details Sensorless brushless motor Sensorless brushless motor

2006-10-17

2006-10-17

Donovan, Lincoln (Department: 2837)

Electricity: motive power systems

Limitation of motor load, current, torque or force

C318S254100, C318S721000, C318S722000

Reexamination Certificate

active

07122985

ABSTRACT:
A sensorless brushless motor controls a rotational speed of a rotor by sequentially energizing a plurality of excitation coils constituting a stator in accordance with a logical product between an energizing timing signal generated on the basis of a back electromotive forces and a pulse width modulation signal to control a pulse width of the pulse width modulation signal, wherein back EMF induced in the plurality of excitation coils are respectively supplied to first and second comparator circuits each having a different reference voltage, respective output signals from the first and the second comparator circuits are sampled simultaneously at a predetermined cycle, and the energizing timing signal is generated at the time of the respective output signals from the first and the second comparator circuits becoming a high-level or a low-level during the sampling. The accuracy of rotor position detection by using a back EMF is improved.

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patent: 6570353 (2003-05-01), Krotsch et al.
patent: 2004/0080293 (2004-04-01), Kurosawa et al.

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