Drive circuit for an air bearing motor
First Claim
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1. A drive circuit for an aerodynamic bearing electric motor having an aerodynamic bearing of the motor shaft, the drive circuit comprising:
- a power supply for providing a supply voltage or DC-link voltage to an inverter for driving the aerodynamic bearing electric motor;
at least one means for storing electrical energy by which the aerodynamic bearing electric motor is supplied with electrical energy on a failure of the supply voltage or DC-link voltage to control the inverter to obtain a minimum speed of the motor shaft required for the aerodynamic bearing electric motor; and
a controller for monitoring the rotational speed of the aerodynamic bearing electric motor shaft, and the supply voltage or DC-link voltage to supply the aerodynamic bearing electric motor with electrical energy from the at least one means for storing electrical energy upon the failure of the supply voltage or DC-link voltage to control the inverter to obtain the minimum speed of the aerodynamic bearing motor shaft required for the aerodynamic bearing electric motor.
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Abstract
The invention relates to a drive circuit for an electric motor having an aerodynamic bearing of the motor shaft, wherein the drive circuit comprises at least one storage means for storing electrical energy by which the electric motor can be fed with electrical energy on a failure of the supply voltage or DC-link voltage to obtain a minimum speed of the motor shaft required for the air support at least at times.
80 Citations
20 Claims
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1. A drive circuit for an aerodynamic bearing electric motor having an aerodynamic bearing of the motor shaft, the drive circuit comprising:
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a power supply for providing a supply voltage or DC-link voltage to an inverter for driving the aerodynamic bearing electric motor; at least one means for storing electrical energy by which the aerodynamic bearing electric motor is supplied with electrical energy on a failure of the supply voltage or DC-link voltage to control the inverter to obtain a minimum speed of the motor shaft required for the aerodynamic bearing electric motor; and a controller for monitoring the rotational speed of the aerodynamic bearing electric motor shaft, and the supply voltage or DC-link voltage to supply the aerodynamic bearing electric motor with electrical energy from the at least one means for storing electrical energy upon the failure of the supply voltage or DC-link voltage to control the inverter to obtain the minimum speed of the aerodynamic bearing motor shaft required for the aerodynamic bearing electric motor. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13, 14, 15, 16, 17, 18, 19, 20)
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Specification