JPH0182672U - - Google Patents

Description

[Brief explanation of the drawing]

FIG. 1 shows an embodiment of a rotor position detector for a brushless DC motor according to the present invention, FIG. 1a is a front view showing main parts of the motor body, FIG. Figure 2 shows a motor body equipped with a conventional rotor position detector, Figure 2a is a front sectional view, Figure 2b is a left side view, and Figures 3 to 5 illustrate the principle of a brushless DC motor. Regarding the explanatory diagram shown,
FIG. 3 is an explanatory diagram showing the basic circuit, FIGS. 4a and 4b are explanatory diagrams showing the rotational position of the rotor, and FIG. 5 is an explanatory diagram showing the operating order of each switch. 3... Bracket, 5... Pulse generator, 7... Rotating shaft, 8... Rotor position detector, 10... Rotating plate, 10
a, 15a, 16a...convex portion, 15...first rotary plate,
16...Second rotating plate.

Claims (1)

[Scope of Claim for Utility Model Registration] Pulse generators for multiple phases surrounding the rotating shaft are fixed at equal intervals in the circumferential direction to a bracket constituting the electric motor body, and the pulse generators are fixed at equal intervals in the circumferential direction on the outer periphery of a disk. A rotor position detector for a brushless DC motor, in which a rotating plate having a shape in which protrusions protruding in the radial direction are formed at equal intervals is fixed to a rotating shaft in a state where it engages with a pulse generator, wherein the rotating plate is fixed to a rotating shaft in a state in which the rotating plate is formed in a first position. It is characterized by being constructed by overlapping a rotating plate and a second rotating plate and fixed to the rotating shaft so that the relative rotation angle between the first rotating plate and the second rotating plate around the rotating shaft can be changed. Rotor position detector for brushless DC motors.