| 摘要 |
[Problem] To reduce the influence of a magnetic leakage flux from a motor electromagnetic part or an electromagnetic brake on a magnetic field sensor. [Solution] A servomotor SM provided with an encoder 100 has a motor electromagnetic part M for rotating a motor shaft SH1, and an electromagnetic brake 200 for braking the motor shaft SH1. The encoder 100 is provided with magnets 111a-111d which are supported so as to rotate together with the motor shaft SH1, and a magnetic body 121 having a large Barkhausen effect; and has magnetic field sensors 120a-120c for detecting the magnetic field of the magnets 111a-111d, and post members 147a-147c as magnetic flux induction members for inducing the magnetic leakage flux such that the magnetic leakage flux leaking from at least one of the motor electromagnetic part M or the electromagnetic brake 200 toward the magnetic field sensors 120a-120c flows in a direction perpendicular to the longitudinal direction of the magnetic field sensors 120a-120c. |
