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Title:
CARRYING VEHICLE
Document Type and Number:
Japanese Patent JP2004284555
Kind Code:
A
Abstract:

To limit a speed even in manual traveling with respect to a carrying vehicle provided with an auxiliary electric function.

In a power source line 30 connecting a motor M to a direct-current power supply 31, a first switch 32 is interposed, a short circuit line 34 is connected so as to short-circuit both ends of a motor winding, and a second switch 36 is interposed. In the manual traveling, while the first switch 32 is maintained in an opened state, control is executed so that the second switch 36 is turned on and off repeatedly, particularly, a small braking force mode in which an on section of a fixed period pulse is short, namely, short circuit duration is short, and a braking force by electromagnetic induction is small, can be mutually switched into a large braking force mode in which an on section is long and a braking force is large. When an encoder detects that the speed exceeds a predetermined value in the manual traveling, a mode is switched into the large braking force mode, a large braking force is applied and the speed is decreased. Even in the manual traveling, the maximum speed is limited and stable travel can be expected.


Inventors:
KATO SONOO
ADACHI YOSHITAKA
SAKAI TADASHI
Application Number:
JP2003082206A
Publication Date:
October 14, 2004
Filing Date:
March 25, 2003
Export Citation:
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Assignee:
HOSHIZAKI ELECTRIC CO LTD
International Classes:
B62B5/04; B60L7/04; B62B3/00; H02P3/12; (IPC1-7): B62B3/00; B60L7/04; B62B5/04; H02P3/12
Domestic Patent References:
JPH08268286A1996-10-15
JP2001180494A2001-07-03
Attorney, Agent or Firm:
Goro Kazuo
High Yoshiyuki Ki