VEHICLE POWER SHARING AND GRID CONNECTION SYSTEM FOR ELECTRIC MOTORS AND DRIVES
First Claim
1. Apparatus for sharing electric power between multiple energy sources in a vehicle or machine comprising:
- an AC electric motor;
a first motor drive inverter for delivering a first AC current to AC motor wires of said electric motor;
a first source of DC power for delivering a DC voltage to said first motor drive inverter;
a second motor drive inverter for delivering AC current to said AC motor wires of said electric motor;
a second source of DC electric power for delivering a DC voltage to said second motor drive inverter;
a controller connected to both of said first and second motor drive inverters containing basic operational parameters and providing an interface to the vehicle or machine, whereby said controller distributes power between said first and second sources of DC according to varying torque demands of said electric motor, and whereby said second source of DC has most of the power capacity of said power sharing system for providing short bursts of power when required by said motor; and
a switch for interrupting connection between said inverter during ground faults or other system errors.
2 Assignments
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Accused Products
Abstract
A power sharing system for electric motors and drives shares power between multiple power sources. Multiple motor drives share power between multiple energy sources, without the need for a DC to DC converter. A motor drive adapts the DC voltage range of the power source to either AC voltage or a different DC voltage range to operate one or more electric motors. Either a capacitor bank or a battery is directly connected to a motor drive'"'"'s DC input. Two separate DC inputs exist, each able to operate at its own voltage and both feeding the same motor through separate motor drives, to allow batteries to be operated at one voltage level while capacitors are operated at another. The motor drives inherently cause power to flow between the motor and either power source, regardless of the relative voltages of the two sources, provided that each source is at a sufficient voltage to power the motor independently.
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Citations
10 Claims
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1. Apparatus for sharing electric power between multiple energy sources in a vehicle or machine comprising:
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an AC electric motor; a first motor drive inverter for delivering a first AC current to AC motor wires of said electric motor; a first source of DC power for delivering a DC voltage to said first motor drive inverter; a second motor drive inverter for delivering AC current to said AC motor wires of said electric motor; a second source of DC electric power for delivering a DC voltage to said second motor drive inverter; a controller connected to both of said first and second motor drive inverters containing basic operational parameters and providing an interface to the vehicle or machine, whereby said controller distributes power between said first and second sources of DC according to varying torque demands of said electric motor, and whereby said second source of DC has most of the power capacity of said power sharing system for providing short bursts of power when required by said motor; and a switch for interrupting connection between said inverter during ground faults or other system errors. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10)
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Specification