CODE DISK, OPTICAL ENCODER, AND MOTOR SYSTEM
First Claim
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1. An optical encoder, comprising:
- a light source;
a light sensor array; and
a code disk including;
a data track having a plurality of slots configured to allow light from the light source to pass to the light sensor array to determine a rotational position of the code disk; and
a commutation pattern having;
a first commutation track including a series of apertures configured to allow light to continuously pass from the light source to a first light sensor of the light sensor array as the series of apertures passes over the first light sensor;
a second commutation track including a series of apertures configured to allow light to continuously pass from the light source to a second light sensor of the light sensor array as the series of apertures passes over the second light sensor; and
a third commutation track including a series of apertures configured to allow light to continuously pass from the light source to a third light sensor of the light sensor array as the series of apertures passes over the third light sensor;
wherein the relative positions of the first, second, and third commutation tracks correspond to a commutation sequence of a brushless motor.
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Abstract
An optical encoder includes a light source, a light sensor array, and a code disk having a data track and a commutation pattern. The commutation pattern includes first, second, and third commutation tracks, each including a series of apertures configured to allow light to continuously pass from the light source to a respective light sensor of the light sensor array as the series of apertures passes over the first light sensor. The relative positions of the first, second, and third commutation tracks correspond to a commutation sequence of a brushless motor.
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Citations
20 Claims
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1. An optical encoder, comprising:
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a light source; a light sensor array; and a code disk including; a data track having a plurality of slots configured to allow light from the light source to pass to the light sensor array to determine a rotational position of the code disk; and a commutation pattern having; a first commutation track including a series of apertures configured to allow light to continuously pass from the light source to a first light sensor of the light sensor array as the series of apertures passes over the first light sensor; a second commutation track including a series of apertures configured to allow light to continuously pass from the light source to a second light sensor of the light sensor array as the series of apertures passes over the second light sensor; and a third commutation track including a series of apertures configured to allow light to continuously pass from the light source to a third light sensor of the light sensor array as the series of apertures passes over the third light sensor; wherein the relative positions of the first, second, and third commutation tracks correspond to a commutation sequence of a brushless motor. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13, 14, 15, 16)
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17. A motor system, comprising:
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a brushless motor; and an optical encoder including; a light source; a light sensor array; and a code disk including; a data track having a plurality of slots configured to allow light from the light source to pass to the light sensor array to determine a rotational position of the code disk; and a commutation pattern having; a first commutation track including a series of apertures configured to allow light to continuously pass from the light source to a first light sensor of the light sensor array as the series of apertures passes over the first light sensor; a second commutation track including a series of apertures configured to allow light to continuously pass from the light source to a second light sensor of the light sensor array as the series of apertures passes over the second light sensor; and a third commutation track including a series of apertures configured to allow light to continuously pass from the light source to a third light sensor of the light sensor array as the series of apertures passes over the third light sensor; wherein the relative positions of the first, second, and third commutation tracks correspond to a commutation sequence of the brushless motor. - View Dependent Claims (18, 19)
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20. A code disk for an optical encoder, comprising:
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a data track having a plurality of slots configured to allow light from a light source to pass to a light sensor array to determine a rotational position of the code disk; and a commutation pattern having; a first commutation track including a series of apertures configured to allow light to continuously pass from the light source to a first light sensor of the light sensor array as the series of apertures pass over the first light sensor; a second commutation track including a series of apertures configured to allow light to continuously pass from the light source to a second light sensor of the light sensor array as the series of apertures passes over the second light sensor; and a third commutation track including a series of apertures configured to allow light to continuously pass from the light source to a third light sensor of the light sensor array as the series of apertures passes over the third light sensor; wherein the relative positions of the first, second, and third commutation tracks correspond to a commutation sequence of a brushless motor.
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Specification