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US 10,514,040 B2Granted
Vacuum system
AssigneeEdwards Limited
InventorsJames Alexander Haylock, Richard Lee Harkin, Ian Keech, Jian Li
Life of this patent
Estimating the term…
Abstract
A vacuum system includes a vacuum pump and an electric motor for driving the vacuum pump. A cooling arrangement cools the vacuum system. A control performs at least one of decreasing voltage and increasing frequency of a signal applied to the electric motor to decrease an amount of magnetic flux generated in the electric motor instead of decreasing the current applied to the electric motor to arrive at a desired torque generated by the electric motor in response to pumping requirements of the vacuum pump.
Claims12
A vacuum system comprising:
- (a) a vacuum pump;
- (b) an electric motor for driving the vacuum pump;
- (c) a cooling arrangement for cooling the vacuum system;
- and (d) a control for performing at least one of decreasing voltage and increasing frequency of a signal applied to the electric motor to decrease an amount of magnetic flux generated in the electric motor instead of decreasing the current applied to the electric motor to arrive at a desired torque generated by the electric motor in response to pumping requirements of the vacuum pump.
1 more element
Dependencies are inferred from the claim text.