Electricity: motive power systems – Switched reluctance motor commutation control
Reexamination Certificate
2007-08-28
2007-08-28
Donovan, Lincoln (Department: 2837)
Electricity: motive power systems
Switched reluctance motor commutation control
C318S434000, C318S132000
Reexamination Certificate
active
10854823
ABSTRACT:
A laser level with a sensorless DC motor controller having a feedback sampling circuit connected in parallel with the coil to sense back EMF. An integrator provides a feedback signal from the sensed back EMF, which the amplified difference from a reference level is used as a pulse width control signal. A pulse width modulation generator uses the control signal to generate variable “on” time pulse widths for each motor drive pulse such that high resolution is provided to the DC motor, permitting accurate rotor position at low rotational speeds. It is emphasized that this abstract is provided to comply with the rules requiring an abstract to allow a searcher or other reader to quickly ascertain the subject matter of the technical disclosure. It is submitted with the understanding that is will not be used to interpret or limit the scope or meaning of the claims.
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Dinsmore & Shohl LLP
Donovan Lincoln
McCloud Renata
Trimble Navigation Limited
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