| 摘要 |
<p><P>PROBLEM TO BE SOLVED: To prevent quality degradation of a bearing due to increased leakage flux easily and inexpensively even with a structure having an increased number of electromagnetic brakes. <P>SOLUTION: At least two electromagnetic brakes 4, each of which includes a brake disc 5, a stationary braking plate 6, a movable braking plate 7, a spring 8 for brake operation and an electromagnetic coil 9 for brake release, are independently disposed in parallel in the axial direction C of a motor shaft 2. The electromagnetic brake device 3 for a motor is constructed by connecting respective electromagnetic coils 9, 9 to a power supply 12 so that a direction in which a leakage flux A from one electromagnetic coil 9 flows and a direction in which a leakage flux B from the other electromagnetic coil 9 flows are opposite to each other, relative to a bearing 11 composed of a magnetic material supported on a motor shaft 2 at a proximity position of the electromagnetic brake 4, upon concurrently energizing the electromagnetic coils 9, 9 mounted independently of each other. <P>COPYRIGHT: (C)2011,JPO&INPIT</p> |
