To attain stable start with high starting torque and accelerating performance according to load fluctuations, and to always achieve control without out-of-step while having quick speed followability at rapid acceleration and rapid deceleration after start.
A counter-electromotive voltage induced in a stator winding along with the rotation of a rotor is controlled by detecting the counter-electromotive voltage in a position to provide commutation timing to determine a commutation timing. The commutation timing is detected at the phase where the counter-electromotive voltage turns positive and at the phase where the counter-electromotive voltage turns negative, and the timing is treated as the commutation timing. The commutation timing is measured in an acceleration state after start and at a position having a large amplitude of the counter-electromotive voltage, the commutation timing is measured in a large counter-electromotive voltage state even at start so that flexible start under various load conditions is realized through commutation control by measuring voltage. Out-of-step at rapid acceleration and rapid deceleration after start is also prevented.
TSUKUNI TSUNEJI
ICHISE TAAKI
| JPH11146685A | 1999-05-28 | |||
| JP2008005632A | 2008-01-10 | |||
| JP2002359991A | 2002-12-13 | |||
| JPH06276783A | 1994-09-30 | |||
| JPH0823695A | 1996-01-23 | |||
| JP2004364359A | 2004-12-24 |