Harmonic Drive Systems Inc.

Toshiyuki Abe

Toshiki Maruyama

Kiyoto Kobayashi

Kozo Sasaki

Muneo Mitamura

Yoshinori Ito

Hiroshi Kameda

Toshiaki Kamata

An electromagnetic brake device () is assembled to a rear end section of a small-sized motor (). The electromagnetic brake device () has a rotating disc () fixed to a motor rotation shaft (), a sliding disc () slidable in an axial direction, a coil spring () pressing the sliding disc () to the rotating disc (), and an electromagnet () capable of attracting the sliding disc () against spring force. A circular recess () is formed in the center of a rear end surface of a yoke () of the electromagnet (). In a state where the electromagnetic brake device () is assembled, a bearing () supporting a rear end shaft section () of the motor rotation shaft is received in the circular recess (). As a consequence, no large circular dead space is produced at a portion on the outer periphery side of the bearing (), which portion is between a motor end plate () and a rear end surface of the electromagnetic brake device (). As a result, the length of the shaft of the small-sized motor () is suppressed from increasing.

Electromagnetic brake device for small-sized motor

In the magnetic absolute encoder, an ordinary operating circuit and an ordinary/backup operating circuit are actuated during ordinary operation in which power is supplied from the ordinary operating power supply; the single-rotation absolute value (1) and single-rotation absolute value (2) detected by these circuits are compared by the abnormality diagnosis circuit, and the presence or absence of an abnormality is automatically judged During backup in which the ordinary operating power supply is interrupted, only the low-power-consumption ordinary/backup operating circuit is actuated, and the multiple-rotation value (2) is detected At the point in time at which the system is returned to ordinary operation, the multiple-rotation value setting circuit sets the multiple-rotation value (2) as the multiple-rotation value (1) of the ordinary operating circuit. As a result, the calculation operation of the multiple-rotation value (1) can be restarted.

Magnetic absolute encoder

An absolute sensor has a high speed side encoder mounted on a high speed rotational shaft , a low speed rotational shaft arranged coaxially with the high speed rotational shaft , a planetary gear mechanism for reducing the speed of rotation of the high speed rotational shaft and delivering the rotation of reduced speed to the low speed rotational shaft . The planetary gear mechanism has a fixed sun internal gear a, a front stage planetary gear b, a rear stage planetary gear c, and an output sun internal gear d connected to the rear stage planetary gear c and low speed rotational shaft , wherein the planetary gears b and c are rotatably supported by an eccentric shaft portion of the shaft . The planetary gear mechanism can be constituted so that the input and output shafts are arranged coaxially, and can be made small with having a large reduction ratio in comparison with the conventional reduction mechanism comprised by spur gears.

Absolute sensor

Growing community of inventors

Minamiazumi-gun, Japan

Toshiyuki Abe