Electric Motor And Method Of Controllling Said Motor
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United States of America Patent
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Issued Date -
Jul 3, 2008
app pub date -
Feb 28, 2006
filing date -
Mar 4, 2005
priority date (Note) -
Abandoned
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Abstract
The invention relates to a sensorless electric motor and a method of controlling such an electric motor, which motor comprises a permanently magnetic rotor, a stator having at least one winding, and a power stage for influencing the current flowing through the winding. As a function of a predetermined commutation duration (T_K), a commutation period is defined, during which period the direction of the magnetic field generated by current flow through the winding is not modified, during which period a commutation completion operation (107) and a commutation initiation operation (109) take place, and which period starts at a first commutation instant (t_K.sub.N) and ends at a second commutation instant (t_K.sub.N+1); preferably, commutation timing is adjusted, based upon a value of induced voltage picked up at a currently non-energized one of the winding strands, during a plateau portion (108) of a winding voltage trace, located temporally between commutation instants.
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