US 6,791,217 B2 · Method and system for motor velocity measurement

Abstract

A method and system for determining the velocity of a rotating device is described herein. The system includes an apparatus with a set of sense magnets affixed to a rotating shaft of the rotating device and a circuit assembly. The circuit assembly includes a circuit interconnection having a plurality of sense coils and sensors affixed thereto. The circuit assembly is adapted be in proximity to the set of sense magnets on the rotating part. A controller is coupled to the circuit assembly, where the controller executes an adaptive algorithm that determines the velocity of the rotating device. The algorithm is a method of combining a derived velocity with a velocity from the tachometer. The algorithm includes a plurality of functions including: receiving a position signal related to the rotational position of the shaft; determining a derived velocity from the position signal; generating a plurality of tachometer velocity signals; determining a compensated velocity in response to the plurality tachometer velocity signals; and blending the compensated velocity with derived velocity to generate a blended velocity output.

Claims63

Dependent claims

A system for determining a velocity of a rotating device, comprising:

an apparatus having a rotational part including a set of sense magnets affixed to a rotating shaft of said rotating device configured to rotate about a rotation axis;
a circuit assembly, including a circuit interconnection having a plurality of sense coils, a sensor affixed to said circuit assembly, said circuit assembly adapted to be in proximity to said set of sense magnets;
wherein said set of sense magnets combines with said circuit assembly to form an air core electric machine such that voltages generated from each sense coil of said plurality of sense coils exhibits an amplitude proportional to said velocity;
a controller coupled to said circuit assembly, said controller adapted to execute an adaptive algorithm including:
receiving a position signal related to rotational position transmitted to said controller;
determining a derived velocity signal utilizing said position signal;
receiving a plurality of tachometer velocity signals;
determining a compensated velocity signal in response to said plurality of measured tachometer velocity signals;
blending said plurality of compensated velocity signals with said derived velocity signal under selective conditions to generate a blended velocity output indicative of said velocity of said rotating device.

6 more elements

A method for determining a velocity of a rotating device, comprising:

generating a plurality of tachometer velocity signals and a position signal with an apparatus comprising:
a rotational part including a set of sense magnets affixed to a rotating shaft of said rotating device configured to rotate about a rotation axis;
a circuit assembly, including a circuit interconnection having a plurality of sense coils, a sensor affixed to said circuit assembly, said circuit assembly adapted to be in proximity to said set of sense magnets;
and
wherein said set of sense magnets combines with said circuit assembly to form an air core electric machine such that voltages generated from each sense coil of said plurality of sense coils exhibits an amplitude proportional to said velocity;
executing an adaptive algorithm with a controller coupled to said circuit assembly, said controller:
receiving said position signal related to rotational position, and determining a derived velocity signal utilizing said position signal;
receiving said plurality of tachometer velocity signals;
determining a compensated velocity signal in response to said plurality of tachometer velocity signals;
and
blending said plurality of compensated velocity signals with said derived velocity signal under selective conditions to generate a blended velocity output indicative of said velocity of said rotating device.

8 more elements

A storage medium encoded with a machine-readable computer program code;

wherein said code includes instructions for causing a controller to implement a method for determining a velocity of a rotating device comprising:
generating a plurality of tachometer velocity signals and a position signal with an apparatus comprising:
a rotational part including a set of sense magnets affixed to a rotating shaft of said rotating device configured to rotate about a rotation axis;
a circuit assembly, including a circuit interconnection having a plurality of sense coils, a sensor affixed to said circuit assembly, said circuit assembly adapted to be in proximity to said set of sense magnets;
wherein said set of sense magnets combines with said circuit assembly to form an air core electric machine such that voltages generated from each sense coil of said plurality of sense coils exhibits an amplitude proportional to said velocity;
executing an adaptive algorithm with a controller coupled to said circuit assembly, said controller:
receiving said position signal related to rotational position, and determining a derived velocity signal utilizing said position signal;
receiving said plurality of tachometer velocity signals;
determining a compensated velocity signal in response to said plurality of tachometer velocity signals;
and
blending said plurality of compensated velocity signals with said derived velocity signal under selective conditions to generate a blended velocity output indicative of said velocity of said rotating device.

8 more elements

A computer data signal embodied in a carrier wave;

wherein said data signal comprises code configured to cause a controller to implement a method for determining a velocity of a rotating device, comprises:
generating a plurality of tachometer velocity signals and a position signal with an apparatus comprising:
a rotational part including a set of sense magnets affixed to a rotating shaft of said rotating device configured to rotate about a rotation axis;
a circuit assembly, including a circuit interconnection having a plurality of sense coils, a sensor affixed to said circuit assembly, said circuit assembly adapted to be in proximity to said set of sense magnets;
wherein said set of sense magnets combines with said circuit assembly to form an air core electric machine such that voltages generated from each sense coil of said plurality of sense coils exhibits an amplitude proportional to said velocity;
executing an adaptive algorithm with a controller coupled to said circuit assembly, said controller:
receiving said position signal related to rotational position, and determining a derived velocity signal utilizing said position signal;
receiving said plurality of tachometer velocity signals;
determining a compensated velocity signal in response to said plurality of tachometer velocity signals;
and
blending said plurality of compensated velocity signals with said derived velocity signal under selective conditions to generate a blended velocity output indicative of said velocity of said rotating device.

8 more elements

Dependencies are inferred from the claim text.

Method and system for motor velocity measurement

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Method and system for motor velocity measurement

Life of this patent

Abstract

Claims63