Electricity: motive power systems – Positional servo systems – Digital or numerical systems
Reexamination Certificate
2008-04-22
2008-04-22
Donovan, Lincoln (Department: 2837)
Electricity: motive power systems
Positional servo systems
Digital or numerical systems
C318S661000, C318S600000
Reexamination Certificate
active
10287127
ABSTRACT:
A system for controlling an electric motor includes a controller and a position indicator that provides position information regarding at least one motor component to the controller. The controller utilizes phase relationships indicative of the position information to determine the actual position of the component of interest. The phase information in one example is derived from the output of a resolver that provides two output signals corresponding to sin (θ) and cos (θ), where θ is the angular position. Utilizing the phase relationship simplifies the task of determining accurate position information that is useful to modify motor control signals to compensate for latency when making position determinations, velocity calculations or both. The inventive system makes it possible to use less expensive electronics to arrive at more reliable results.
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International Search Report completed Jul. 30, 2004 for International Application No. PCT/US 03/35079.
Games John E.
Simmons Howard
Carlson & Gaskey & Olds
Colon Santana Eduardo
Donovan Lincoln
Hamilton Sundstrand Corporation
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