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Title:
CONVEYANCE DEVICE
Document Type and Number:
Japanese Patent JPH0739016
Kind Code:
A
Abstract:

PURPOSE: To provide a conveyance device wherein an exciting current which magnetically levitates a levitation body can be reduced and a quantity of generated heat can be suppressed.

CONSTITUTION: Exciting currents (m), (n) which are supplied to an upper-part rear-side electromagnet 13a which magnetically levitates the rear part of a levitation body and to a lower-part rear-side electromagnet 13b are controlled individually. A reference signal jB for a second amplifier 36B which supplies the exciting current (m) to the upper-part rear-side electromagnet 13a and a reference signal jA for a first amplifier 36A which supplies the exciting current (n) to the lower-part rear-side electromagnet 13b are regulated respectively by separate variable resistances 37B, 37A. The second reference signal jB is regulated in advance in such a way that the exciting current (m) becomes 0 in a state that the levitation body is magnetically levitated to the middle point. In addition, a sensor signal (the inverse of S) which has been inverted by a third amplifier 36C is supplied to an inversion terminal (-) for the second amplifier 36B, and a sensor signal S is supplied to an inversion terminal for the first amplifier 36A.


Inventors:
Matsuzaki, Ryuichi
Application Number:
JP1993000181516
Publication Date:
February 07, 1995
Filing Date:
July 22, 1993
Export Citation:
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Assignee:
SEIKO SEIKI CO LTD
International Classes:
B60L13/04; B65G54/02; H01L21/677; H01L21/68; (IPC1-7): B60L13/04; B65G54/02; H01L21/68
Attorney, Agent or Firm:
林 敬之助



 
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