Electricity: motor control systems – Closed loop speed control system for dc motor with commutator – Field control – or field and armature control – by analog...
Patent
1996-01-18
1999-03-30
Ro, Bentsu
Electricity: motor control systems
Closed loop speed control system for dc motor with commutator
Field control, or field and armature control, by analog...
388811, 388937, 318245, 318432, H02P 700
Patent
active
058899227
ABSTRACT:
The invention relates to a method for driving an electric motor (1) which is employed, in particular, in manually guided electric tools, such as drilling machines, screwing machines or the like. Variable pulses of an electric voltage are applied to the electric motor (1) in such a way that the rotor of the electric motor (1) moves at a rotational speed which can be set. In order that the rotor of the electric motor (1) moves intermittently or abruptly, at least parts of at least individual pulses are blanked by superposition of a pulse interval having a zero voltage. A circuit arrangement for a method of this type has control electronics (5) and an electronic power switch (4), such as a triac, a transistor, an IGBT or the like, which is switched by the control electronics (5) in such a way that the variable pulses can be applied to the electric motor (1) via the electronic power switch (4). The control electronics (5) further contain means for switching the electronic power switch (4) off during at least parts of at least individual pulses.
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Bufe Michael
Knappe Alexander
Kuehnemundt Gerhard
Kelemen Gabor J.
Marquardt GmbH
Ro Bentsu
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