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US 6,589,030 B2Granted
Magnetically levitated pump apparatus
AssigneesNtn Corporation, Terumo Kabushiki Kaisha
InventorTakayoshi Ozaki
Life of this patent
Estimating the term…
Abstract
A power supply feeds a dc voltage to an operational amplifier at an inverting input while a motor current command value is input to the operational amplifier at a non-inverting input and when a dc voltage being supplied to a power amplifier varies the operational amplifier responds to the voltage variation by adjusting the motor current command value to alter a control signal applied to a motor control circuit and thus reduce revolution-rate variation.
Claims17
A maglev pump, comprising:
- a pump unit outputting a fluid through revolution of a rotative member in a casing;
- a drive unit magnetically coupled with said rotative member without contacting said rotative member, to rotate said rotative member;
- a position detection unit detecting a position of said rotative member as said rotative member levitates;
- a controlled magnetic bearing unit operative in response to an output of said position detection unit to support said rotative member without contacting said rotative member;
- and
- a control circuit controlling a command signal of said controlled magnetic bearing unit to allow said rotative member to have a position closer to said drive unit when said rotative member starts magnetic levitation.
3 more elements
A maglev pump comprising:
- a pump unit having in a casing a rotative member rotated to output a fluid;
- a support supporting said rotative member;
- a drive unit rotating said rotative member;
- and
- a control circuit controlling and thus preventing said rotative member from having a revolution rate varying when a supplied power supply voltage varies while said rotative member is rotating in a mode controlling a current to be constant.
2 more elements
Dependencies are inferred from the claim text.