Login| Sign Up| Help| Contact|

Patent Searching and Data


Title:
MOTOR CONTROLLER AND ITS SPEED DETECTION METHOD
Document Type and Number:
Japanese Patent JP2009095154
Kind Code:
A
Abstract:

To provide a motor controller which can detect exact speed over the entire speed control range by detecting the speed based on the detection of position and the time required for change of position when it is above a certain speed, and by detecting the speed based on the change of position during sampling time when it is below a certain speed, and to provide its speed detection method.

An encoder 3 outputs time data, i.e. measurements of time required for change of positional data during the sampling time. A speed calculation section 15 defines the positional data as first positional data, generates second positional data by decimating predetermined amount of the first positional data, and generates third positional data by decimating predetermined amount of the second positional data, and then calculates the motor speed based on the second and third positional data.


More Like This:
Inventors:
SATO KAZUO
Application Number:
JP2007263933A
Publication Date:
April 30, 2009
Filing Date:
October 10, 2007
Export Citation:
Click for automatic bibliography generation   Help
Assignee:
YASKAWA ELECTRIC CORP
International Classes:
H02P29/00