Method for operating an electronically commutated electric motor and apparatus therefor
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United States of America Patent
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Jul 23, 2013
Grant Date -
Nov 17, 2011
app pub date -
May 6, 2011
filing date -
May 12, 2010
priority date (Note) -
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Abstract
The invention relates to a method of controlling the run-up of an electronically commutated electric motor (1) to drive a tool. A rotor (7) rotates in the rotating field (21) of the stator (2). The field windings (3, 4, 5) alternately have a supply voltage applied thereto via an actuation unit (10) in order to obtain an advancing motor rotating field. For advancing the rotating field in the rotational direction (29) of the rotor (7), the inductance of the arrangement of the field coils (3, 4, 5), which is ascertained via a changing measuring current (IM), is evaluated and the advancement is carried out upon reaching a maximum.
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