Electronic balance having a position control mechanism
AssigneeShimadzu Corporation
InventorsTsuyoshi Satoh, Kimitoshi Tamura, Kunio Shimauchi
Life of this patent
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Abstract
An electronic balance of an electromagnetic force balancing type comprises electromagnetic force generators for applying electromagnetic forces for controlling to move a balance beam in a longitudinal direction (X axis) and a horizontal direction (Y axis) orthogonal thereto, PID controllers for controlling the electromagnetic force generators by a PID control, and a three axes directions position detector for detecting displacements in three directions of X, Y axes directions of the balance beam and a gravitational force direction.
Claims5
An electronic balance for operating an electromagnetic force generated by flowing a current to a coil placed in a magnetic field of a permanent magnet and a load of a measured object to a balance beam by interposing a fulcrum, and calculating the load from the current flowing in the coil for generating the electromagnetic force balanced with the load, said electronic balance comprising:
- a position control mechanism for maintaining at least one of a specific position in a longitudinal direction of the balance beam or a specific position in a horizontal direction orthogonal to the longitudinal direction constant.
Dependencies are inferred from the claim text.