Series motor and method of controlling the same

Details Series motor and method of controlling the same Series motor and method of controlling the same

2006-10-13

2008-09-23

Duda, Rina I (Department: 2837)

Electricity: motive power systems

Constant motor current, load and/or torque control

C318S474000, C388S907500, C388S937000, C173S007000

Reexamination Certificate

active

07427842

ABSTRACT:
A circuit for a series motor for a power tool is disclosed, wherein reliable switching is achieved by means of two electronic switches, without the use of a mechanically disconnecting switch. To this end, two electronic switches, preferably triacs, are preferably connected in series to each other, the voltage drop across the triacs being continuously monitored by a monitoring circuit. A check for faults can be carried out before switching on the power tool. Alternatively, a fusible cutout can be tripped by means of a protective switch connected in parallel thereto.

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