JPS61178410U - - Google Patents

Description

[Brief explanation of the drawing]

FIG. 1 is a block diagram showing the configuration of an embodiment of the rotational position detecting device for rotating equipment according to the present invention, and FIGS. 2 to 5 are time charts for explaining the operation of the embodiment of the present invention. Fig. 6 is a block diagram showing an example of the configuration of a conventional rotational position detection device for rotating equipment, Figs. 7 and 8 are waveform diagrams for explaining the operation of the conventional example, and Fig. 9 is a diagram showing an example of the configuration of a rotating equipment according to an existing proposal. FIG. 10 is a block diagram showing an example of the configuration of a rotational position detecting device, and is a time chart for explaining the operation of the already proposed device. 31 and 41 are signal selection means, 32 and 42 are zero-cross point detection circuits, 51 is an up-down counter, and 52 is an RS flip-flop.

Claims (1)

[Claims for Utility Model Registration] First and second sine wave signals that change in accordance with rotation and have a phase difference of 90 degrees from a rotating body connected to a rotating shaft of a rotating device. 2
a sine wave signal extraction device; and at least one of the first and second sine wave signals.
a sine wave signal synthesis circuit that obtains a plurality of synthesized sine wave signals by performing addition and subtraction times; a second signal selection means; first and second zero-crossing point detection circuits to which outputs of the first and second signal selection means are supplied, respectively; and outputs of the first and second zero-crossing point detection circuits. a counter and a flip-flop are provided, the counter outputs a rotational position signal of the rotating device, the flip-flop outputs a rotational direction signal of the rotating device, and the counter outputs a rotational direction signal of the rotating device, and the counter outputs a rotational direction signal of the rotating device; When a selection control signal is supplied to the signal selection means and the rotating equipment rotates in the forward direction, each zero-crossing point of the first and second sine wave signals and the plurality of composite sine wave signals is set to the first point. The first signal selection means is controlled so as to be detected by the zero cross point detection circuit, and when the rotating equipment rotates in the opposite direction, the first and second sine wave signals and the plurality of composite sine wave signals A rotational position detection device for a rotating device, wherein the second signal selection means is controlled so that each zero-crossing point of the wave signal is detected by the second zero-crossing point detection circuit.