Electric motor for fuel pump with improved shutdown features
First Claim
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1. A generator and fuel pump assembly comprising:
- a generator operable to be driven to generate electricity, and supply voltage to a bus;
said bus providing voltage to an electric motor for a fuel pump;
said bus including a customer DC bus and an accessory DC bus, said customer DC bus for supplying power to a plurality of electric components, and said accessory bus providing voltage to said electric motor for said fuel pump; and
a shutdown signal indicating that there is a potential problem such that said electric motor should be shut down, and a controller for said electric motor being operable to stop rotation of said electric motor, and to send a reduce voltage signal back upstream to a voltage regulator for said generator to reduce the voltage sent to said bus.
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Abstract
An electric motor for a fuel pump is provided with a shutdown switch positioned intermediate an inverter, and its control coil. In this location, the shutdown function can be achieved without heavy components. In another feature, when the fuel pump is shut down, a signal is sent upstream to a voltage regulator associated with a generator, such that the voltage supplied downstream by the generator can be reduced to eliminate any potential voltage spike due to the shutdown of the electric motor. The electric motor with shutdown switch enables low weight fault tolerant flux regulated machines.
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Citations
21 Claims
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1. A generator and fuel pump assembly comprising:
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a generator operable to be driven to generate electricity, and supply voltage to a bus; said bus providing voltage to an electric motor for a fuel pump; said bus including a customer DC bus and an accessory DC bus, said customer DC bus for supplying power to a plurality of electric components, and said accessory bus providing voltage to said electric motor for said fuel pump; and a shutdown signal indicating that there is a potential problem such that said electric motor should be shut down, and a controller for said electric motor being operable to stop rotation of said electric motor, and to send a reduce voltage signal back upstream to a voltage regulator for said generator to reduce the voltage sent to said bus. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10, 11)
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12. A control for a fuel pump comprising:
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a fuel pump having an electric motor with rotor to drive a shaft for said fuel pump; said motor including a plurality of stator windings and a control coil; a voltage supply for supplying voltage to said plurality of stator windings and to said control coil, and an inverter positioned intermediate said power supply, and said control and stator coils; and a shut off switch for stopping operation of said electric motor, said shut off switch being positioned downstream of said inverter, and upstream of said control coil, said downstream and upstream positions being defined relative to a direction of power flow, and said shut off switch being operable to block supply of voltage to said control coil. - View Dependent Claims (13, 14, 15)
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16. A generator and fuel pump assembly comprising:
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a generator operable to be driven to generate electricity, and supply voltage to a bus; said bus providing voltage to an electric motor for a fuel pump; a shutdown signal indicating that said electric motor should be shut down, and a controller for said electric motor being operable to stop operation of said electric motor, and to send a reduce voltage signal back upstream to a voltage regulator for said generator to reduce the voltage sent to said bus to account for an expected voltage spike as said electric motor enters a regeneration mode; and said electric motor provided with an inverter receiving power from said bus, and said inverter delivering three phases of power to at least three windings associated with a stator for driving a rotor which is part of said electric motor; and a shutoff switch to stop the supply of voltage to said control coil positioned intermediate said control coil and said inverter, and said shutdown signal opening said shutoff switch. - View Dependent Claims (17, 18, 19, 20, 21)
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Specification