Optical sensor and method for estimating positions of rotors in a motor and the motor comprising the optical sensor
First Claim
1. An optical sensor for estimating the position of a rotor in a motor, the motor further having a stator and being used for electric machines, the stator having stator tooth slots, and the optical sensor comprising:
- an optical source mounted on a surface of the rotor where an aft gap is big enough to not block magnetic flux between the rotor and the stator; and
a plurality of photo detectors arranged inside respective stator tooth slots and evenly distributed around the circumference of the stator and configured to detect light emitted by the optical source and output parameters which are used to estimate the position of the rotor.
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Accused Products
Abstract
An optical sensor for estimating positions of rotors in a motor comprises an optical source (21) and a plurality of photo detectors (22), the motor further has stators and is used for e-machines, the optical source (21) is mounted on the surface of the rotor where the air gap is big enough to not block magnetic flux between the rotors and the stators, the photo detectors (22) are arranged evenly around the stator tooth slots and configured to detect light emitted by the optical source (21) and output parameters which are used to estimate the positions of rotors. The proposed low cost optical sensor measures the angular position of rotating e-machine when sensorless control algorithm is applied but limited by response time at high speed region. The optical sensor only adds small cost and provides rotor position information with enough accuracy for FOC control at high rotational speed. A method for estimating positions of rotors in a motor and a motor comprising the optical sensor are also provided.
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Citations
9 Claims
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1. An optical sensor for estimating the position of a rotor in a motor, the motor further having a stator and being used for electric machines, the stator having stator tooth slots, and the optical sensor comprising:
- an optical source mounted on a surface of the rotor where an aft gap is big enough to not block magnetic flux between the rotor and the stator; and
a plurality of photo detectors arranged inside respective stator tooth slots and evenly distributed around the circumference of the stator and configured to detect light emitted by the optical source and output parameters which are used to estimate the position of the rotor. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9)
- an optical source mounted on a surface of the rotor where an aft gap is big enough to not block magnetic flux between the rotor and the stator; and
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