Electric powertrain system having bidirectional DC generator
First Claim
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1. An electric powertrain for use with an engine and a traction device, comprising:
- a DC motor/generator operable to;
receive at least a portion of a first mechanical output from the engine and produce a DC power output; and
receive DC power and produce a second mechanical output;
a drivetrain operable to;
receive the DC power output and use the DC power output to drive the traction device; and
generate DC power when the traction device is operated in a dynamic braking mode;
an AC alternator operable to receive a portion of the first mechanical output and produce an AC power output; and
a rectifier coupled with the AC alternator, the rectifier being operable to convert the AC power output to a DC power output combinable with the DC power output of the DC motor/generator, wherein;
the engine is rated to produce a first amount of mechanical power and to receive a second amount of mechanical power, the second amount of mechanical power being less than the first amount of mechanical power;
the DC motor/generator is sized based on the second amount of mechanical power; and
the AC alternator is sized based on a difference between the first and second amounts of mechanical power.
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Abstract
An electric powertrain for use with an engine and a traction device is disclosed. The electric powertrain has a DC motor/generator operable to receive at least a portion of a first mechanical output from the engine and produce a DC power output. The DC motor/generator is also operable to receive DC power and produce a second mechanical output. The electric powertrain further has a drivetrain operable to receive the DC power output and use the DC power output to drive the traction device. The drivetrain is also operable to generate DC power when the traction device is operated in a dynamic braking mode.
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Citations
18 Claims
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1. An electric powertrain for use with an engine and a traction device, comprising:
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a DC motor/generator operable to; receive at least a portion of a first mechanical output from the engine and produce a DC power output; and receive DC power and produce a second mechanical output; a drivetrain operable to; receive the DC power output and use the DC power output to drive the traction device; and generate DC power when the traction device is operated in a dynamic braking mode; an AC alternator operable to receive a portion of the first mechanical output and produce an AC power output; and a rectifier coupled with the AC alternator, the rectifier being operable to convert the AC power output to a DC power output combinable with the DC power output of the DC motor/generator, wherein; the engine is rated to produce a first amount of mechanical power and to receive a second amount of mechanical power, the second amount of mechanical power being less than the first amount of mechanical power; the DC motor/generator is sized based on the second amount of mechanical power; and the AC alternator is sized based on a difference between the first and second amounts of mechanical power. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10, 11)
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12. An electric powertrain for use with an engine and a traction device, comprising:
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a motor/generator configured to; receive at least a portion of a first mechanical output from the engine and produce a power output; and receive power and produce a second mechanical output; a drivetrain configured to; receive the power output and use the power output to drive the traction devices; and generate power when the traction device is operated in a dynamic braking mode; an alternator configured to receive a portion of the first mechanical output and produce an AC power output; and a rectifier connected to the alternator, the rectifier being configured to convert the AC power output to a DC power output combinable with the power output of the motor/generator, wherein; the engine is rated to produce a first amount of mechanical power and to receive a second amount of mechanical power, the second amount of mechanical power being less than the first amount of mechanical power; the motor/generator has a capacity corresponding to the second amount of mechanical power; and the alternator has a capacity corresponding to a difference between the first and second amounts of mechanical power. - View Dependent Claims (13)
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14. An electric powertrain for use with an engine and a traction device, comprising:
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a DC motor/generator configured to receive at least a portion of a first mechanical output from the engine and produce a DC power output, and to receive DC power and produce a second mechanical output; at least one AC traction motor operable to act as an AC motor and an AC generator; a bidirectional power converter coupled between the DC motor/generator and the at least one AC traction motor, the bidirectional power converter being operable to act as an inverter and a rectifier to receive the DC power output from the DC motor/generator and use the DC power output to drive the at least one traction motor, and to generate DC power directed to the DC motor/generator when the at least one AC traction motor is operated in a dynamic braking mode; and an AC alternator operable to receive a portion of the first mechanical output and produce an AC power output, wherein; the engine is rated to produce a first amount of mechanical power and to receive a second amount of mechanical power, the second amount of mechanical power being less than the first amount of mechanical power; the DC motor/generator has a capacity corresponding to the second amount of mechanical power; and the alternator has a capacity corresponding to a difference between the first and second amounts of mechanical power. - View Dependent Claims (15, 16, 17, 18)
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Specification