Motor driving device and electric power steering apparatus

Details Motor driving device and electric power steering apparatus Motor driving device and electric power steering apparatus

2008-06-03

2008-06-03

Ip, Paul (Department: 2837)

Electricity: motive power systems

Constant motor current, load and/or torque control

C318S430000, C388S811000

Reexamination Certificate

active

07382105

ABSTRACT:
In a motor driving device where a motor having a winding wire with small inductance value is driven by a digital control means comprised of control means including a current command value calculating means, a current control means and a PWM control means whose sampling periods are different from each other, when discrete signals sampled by the respective control means are zero-order-held, a motor current includes a lot of higher harmonic waves due to a quantization error, thereby increasing a motor noise.When an n-th-order hold means is provided between the respective control means with different sampling periods, the quantization error can be reduced remarkably, and thus the higher harmonic wave components included in the motor current are reduced, thereby greatly reducing the motor noise.

REFERENCES:
patent: 5023535 (1991-06-01), Miller et al.
patent: 5365385 (1994-11-01), Hargarten et al.
patent: 5617574 (1997-04-01), Boutaud et al.
patent: 5764017 (1998-06-01), Bauck
patent: 5829054 (1998-10-01), Ehlig et al.
patent: 5935176 (1999-08-01), Nielson
patent: 6134578 (2000-10-01), Ehlig et al.
patent: 6153998 (2000-11-01), Takakura
patent: 6704160 (2004-03-01), Takakura
patent: 2003/0076616 (2003-04-01), Hsin
patent: 2005/0141422 (2005-06-01), Roach et al.
patent: 1696551 (2006-08-01), None
patent: 6-276097 (1994-09-01), None
patent: 11-18469 (1999-01-01), None
patent: 2000-18069 (2000-01-01), None
patent: 2000135983 (2000-05-01), None
patent: 2000-184773 (2000-06-01), None

Affiliated with

Also associated with

Rating

Motor driving device and electric power steering apparatus does not yet have a rating. At this time, there are no reviews or comments for this patent.

If you have personal experience with Motor driving device and electric power steering apparatus, we encourage you to share that experience with our LandOfFree.com community. Your opinion is very important and Motor driving device and electric power steering apparatus will most certainly appreciate the feedback.

Rate now

Comments { 0 }

Profile ID: LFUS-PAI-O-2813406