MOTOR DRIVE DEVICE FOR FORKLIFT AND ELECTRIC FORKLIFT UTILIZING SAME

WIPO Patent Application WO/2015/068553

A1

A speed distribution unit (200) calculates a left speed command value (Vlref) for indicating a speed for a left running motor and a right speed command value (Vrref) for indicating a speed for a right running motor on the basis of an input speed command value (Vref) corresponding to an operation performed by a driver and a steering angle (δr) of turning wheels of an electric forklift. A torque command value generation unit (202) generates torque command values (Tlcom, Trcom) for indicating torques for the right and left running motors on the basis of the left speed command value (Vlref) and right speed command value (Vrref). An area wherein the turning center of the electric forklift overlaps with a driving wheel is defined as a hunting zone. When the steering angle (δr) is within a dead zone corresponding to the hunting zone, a motor drive device (300) sets the speed command value and/or the torque command value for the driving wheel on the inner side to substantially zero.

ITOH TAKUMI (JP)
OKADA JYUNICHI (JP)
IWAMOTO TAKETERU (JP)

PCT/JP2014/077591

May 14, 2015

October 16, 2014

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SUMITOMO HEAVY INDUSTRIES (JP)
SUMITOMO NACCO MATERIALS HANDLING CO LTD (JP)

B62D11/04; B60L15/20; B66F9/24; H02P5/50

JPS5138834U	1976-03-23
JP2000318995A	2000-11-21
JP2008109787A	2008-05-08
JP2013198174A	2013-09-30
JPH06183279A	1994-07-05
JP2013095362A	2013-05-20

MORISHITA SAKAKI (JP)
Sakaki Morishita (JP)

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