JPS62122478U - - Google Patents

Description

[BRIEF DESCRIPTION OF THE DRAWINGS] The drawings show an embodiment of the present invention, in which FIG. 1 is a vertical cross-sectional rear view of the main parts of a brushless motor, FIG. 2 is a partially cutaway cross-sectional plan view of the brushless motor, and FIG. Figure 2 - Line sectional view, Figure 4 is an enlarged view of the main part of Figure 3, Figure 5 is a view taken in the direction of arrow V in Figure 4, Figure 6 is Figure 5 - Line sectional view, Figure 7 is a brushless motor. FIG. 8 is an operation time chart showing the sensor signals of each phase and the excitation and reverse excitation of the coils of each phase. M...Brushless motor, 1...Rotor, 1a...Rotor shaft, 2...Stator, 3...Rotating slit plate, U
, V, W... U-phase, V-phase, W-phase excitation poles, 4U,
4V, 4W...U-phase coil, V-phase coil, W-phase coil, respectively, 5U, 5V...U-phase sensor, V-phase sensor, respectively, 5Ua...light emitting section, 5Ub...light receiving section, 5Va...
Light emitting part, 5Vb... Light receiving part, 6... Rotating pulse sensor, 6a... Light emitting part, 6b... Light receiving part, 7... Trapezoidal slit, 7a, 7b... Edge, 8U... U phase slit, 8
Ua, 8Ub...Edge, 8V...V phase slit, 8V
a, 8Vb...edge, 30...motor housing, 3
1...Printed circuit board, 36a, 36b...terminals.

Claims (1)

[Claims for Utility Model Registration] (1) A motor housing consisting of a rotor that is alternately magnetized with different magnetic poles in the circumferential direction and a multi-phase stator each wrapped with an excitation coil. In order to drive and control a brushless motor, a device includes a plurality of position detectors that generate a plurality of position signals regarding the rotational position of the rotor, and energizes the excitation coils of the plurality of phases of the stator according to the plurality of position signals. In this case, each of the plurality of position detectors includes a light emitting part and a light receiving part arranged close to the rotating body to detect the rotational position of the rotating body fixed to the output shaft of the brushless motor. A circuit board extending in a direction perpendicular to the rotating body is attached to the motor housing, and a light emitting part and a light receiving part of each position detector have a light emitting surface and a light receiving surface facing the rotating body. and the connection terminal thereof is configured to extend along the rotating body in a direction toward the circuit board, and the plurality of position detectors are arranged so as to extend from the center of rotation of the rotating body to the circuit board. A rotation detection device for controlling a brushless motor, characterized in that the rotation detection device is arranged at different positions in a direction intersecting the radial direction of the rotor on the installation side and at different radii from the center of rotation of the rotor. (2) On the rotating body, a detected part that is optically detected by each position detector is formed with a predetermined width in the circumferential direction of the rotating body, and the detected part is formed with a predetermined width in the circumferential direction of the rotating body. The brushless motor according to claim 1, wherein the edge intersecting with the circuit board is formed such that the edge intersects with the circuit board in a direction perpendicular to the circuit board when the edge passes near each position detector. Rotation detection device for control. (3) A number of slits extending narrowly in the radial direction are arranged in the circumferential direction of the rotating body, and a speed detector consisting of a light emitting part and a light receiving part is mounted on the circuit board to detect the slits. Claim 1 of the Utility Model Registration Claim: The speed detector is mounted on a speed detector, and the light emitting part and the light receiving part of the speed detector are arranged so as to be located on a line perpendicular to the circuit board passing through the center of rotation of the rotating body. A rotation detection device for controlling the described brushless motor.