To solve the problem of requiring to reduce a temperature rise in an electromagnetic coil, because a power source is required for generating a high additional voltage for allowing a required electric current to flow, since a self-resistance valve increase through heating self-resistance value when allowing an electric current to flow to the electromagnetic coil, in an electromagnetic brake.
One of the electromagnetic coils 11a and 11b or a coil is arranged outside in the radial direction of the coil storage part of yokes 12a and 12b as holding coils 11a1 and 11b1. The other of the electromagnetic coils 11a and 11b or the coil part is arranged inside in the radial direction of the holding coils 11a1 and 11b1 as promoting coils 11a2 and 11b2. The holding coils 11a1 and 11b1 allow the electric current to flow until from the start of braking releasing operation to the application of braking, and the promoting coils 11a2 and 11b2 allow the electric current to flow in a promoting period at the start of the braking releasing operation.
IGARASHI AKITOMO
ITO KIYOMI
MITO ENGINEERING SERVICE KK
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