초록 ▼

A braking circuit for braking an electric motor having an armature and run and brake windings, which includes a switching circuit disposed between a source of electrical power and the run winding, this circuit being operable to disconnect the run winding from the source of electrical power. The brak

A braking circuit for braking an electric motor having an armature and run and brake windings, which includes a switching circuit disposed between a source of electrical power and the run winding, this circuit being operable to disconnect the run winding from the source of electrical power. The braking circuit further includes a switching mechanism operable to connect the brake winding in order to brake the electric motor. The switching mechanism preferably connects the brake winding after a predetermined period of time has elapsed from the disconnection of the run winding. This braking circuit can be used in a saw for braking the saw's blade.

대표청구항 ▼

[ We claim:] [1.] A braking circuit for braking an electric motor comprising an armature, first and second run windings and a first brake winding, the braking circuit comprising:a first switch disposed between a source of electrical power and the first run winding, the first switch being operable to

[ We claim:] [1.] A braking circuit for braking an electric motor comprising an armature, first and second run windings and a first brake winding, the braking circuit comprising:a first switch disposed between a source of electrical power and the first run winding, the first switch being operable to disconnect the first run winding from the source of electrical power;a semiconductor device disposed between the source of electrical power and the second run winding;a second switch connected to the source of electrical power for changing status of the semiconductor device, the second switch changing the status of the semiconductor device after a first predetermined period of time has elapsed from the disconnection of the first run winding; anda third switch being operable to connect the first brake winding in order to brake the electric motor, wherein the first brake winding is connected after a second predetermined period of time has elapsed from the status change of the semiconductor device.