JP2006149134A5 - - Google Patents

Claims (5)

In an electric motor with a speed reduction mechanism having a plurality of speed reduction gear trains between a motor rotation shaft and an output shaft, an annular motor that rotates integrally with one gear and is magnetized with a plurality of magnetic poles at equal intervals on the rotation circumference a magnet, and two magnetic sensor that outputs a signal corresponding to the detected detection at different phases of the same period the magnetism of the ring magnet, is connected to the output line each from the two magnetic sensors, corresponding to the detection An electric motor with a speed reduction mechanism, comprising switching means for switching a signal level, wherein the switching means is operated by an operating portion that rotates integrally with the output shaft. With reduction gear mechanism an electric motor according to claim 1, wherein said switching means with said switching means is a switch for grounding the output line is convex body rotating integrally with the output shaft. A magnetic sensor that outputs a predetermined level signal the switching means detects the magnetism, magnet pieces in which the switching means is rotated integrally with the output shaft with the magnetic sensor is connected to the output line via a diode The electric motor with a speed reduction mechanism according to claim 1. The electric motor with reduction gear mechanism having a reduction gear train of the multi-stage by spur gears between the output shaft from the motor shaft, one of the spur gears and the rotating shaft is parallel the output and that one spur gear between gear train A printed wiring board is arranged in parallel with these spur gears between the shaft and the other spur gear, and a plurality of magnetic poles are provided concentrically with the one spur gear and equidistantly on the rotation circumference. a magnetized ring magnet, and two magnetic sensor that outputs a signal in response to the detection detected by the disposed printed wiring board different phases of the same period the magnetism of the ring magnets, print formed on the printed circuit board has been connected to said output line each from the two magnetic sensors has a changeover switch for grounding the output line, characterized in that it is operated by the projecting portion thereof changeover switch is provided on the other gear With reduction mechanism The electric motor. The electric motor with reduction gear mechanism having a reduction gear train of the multi-stage by spur gears between the output shaft from the motor shaft, the output shaft one spur gear between the gear train and its one spur gear rotation axis is parallel between the integral of the other spur gears when, these spur gear parallel to the printed circuit board is disposed, a plurality of magnetic poles at regular intervals on a rotating circumference vignetting set together with the one spur gear is concentric a magnetized ring magnet, and two magnetic sensors the disposed printed circuit board to output a signal corresponding to the detected detection at different phases of the same period the magnetism of the ring magnet, mounted to the other spur gear Another magnetic sensor that detects the magnetism of the magnet piece and outputs a signal of a predetermined level in response to the detection, and an output line of the other magnetic sensor outputs each of the two magnetic sensors via a diode. Connected to the line Electric motor with a speed reduction mechanism and butterflies.