Electric powertrain system having bidirectional DC generator
First Claim
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1. An electrical powertrain for use with an engine and a traction device, comprising;
- a DC motor/generator operable to;
receive a first portion of a first mechanical output from the engine and produce a first DC power output for the traction device; and
receive DC power from the traction device and produce a second mechanical output to drive the engine;
an AC alternator operable to;
receive a second portion of the first mechanical output from the engine and produce an AC power output;
a rectifier coupled with the AC alternator, the rectifier operable to;
convert the AC power output to a second DC power output combinable with the first DC power output of the DC motor/generator; and
a drivetrain operable to;
receive and use the first and second DC power output to drive the traction device in a forward mode; and
generate DC power using a bidirectional power converter directed to the DC motor/generator to drive the engine when the traction device is operated in a dynamic braking mode.
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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.
7 Citations
18 Claims
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1. An electrical powertrain for use with an engine and a traction device, comprising;
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a DC motor/generator operable to; receive a first portion of a first mechanical output from the engine and produce a first DC power output for the traction device; and receive DC power from the traction device and produce a second mechanical output to drive the engine; an AC alternator operable to; receive a second portion of the first mechanical output from the engine and produce an AC power output;
a rectifier coupled with the AC alternator, the rectifier operable to;convert the AC power output to a second DC power output combinable with the first DC power output of the DC motor/generator; and a drivetrain operable to; receive and use the first and second DC power output to drive the traction device in a forward mode; and generate DC power using a bidirectional power converter directed to the DC motor/generator to drive the engine when the traction device is operated in a dynamic braking mode. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12)
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13. An electric powertrain for use with an engine and a traction device, comprising:
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a differential configured to receive a first mechanical output from the engine and split the mechanical output into a first portion and a second portion; a DC motor/generator configured to receive the first portion of the first mechanical output and produce a first DC power output for the traction device, and to receive DC power from the traction device and produce a second mechanical output to drive the engine via the differential; an AC alternator operable to receive the second portion of the first mechanical output and produce an AC power output; a rectifier coupled with the AC alternator, the rectifier operable to convert the AC power output to a second DC power output combinable with the first DC power output of the DC motor/generator; at least one AC traction motor operable to act as an AC motor and an AC generator; and 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 to receive the first and second DC power output from the DC motor/generator and the rectifier connecting the AC alternator, respectively, to drive the at least one AC traction motor in the forward mode, and operable as a rectifier to generate the DC power directed to the DC motor/generator to drive the engine when the at least one AC traction motor is operated in the dynamic braking mode. - View Dependent Claims (14, 15, 16)
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17. An electric powertrain for use with an engine and a traction device, comprising:
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a differential having a first rotatable shaft and a second rotatable shaft configured to produce first and second portions of a first mechanical output received from the engine, the first rotatable shaft rotating at a faster rate than the second rotatable shaft; a motor/generator configured to; receive the first portion of a the first mechanical output from the engine and produce a first power output for the traction device; and receive power from the traction device and produce a second mechanical output to drive the engine; an AC alternator operable to receive the second portion of the first mechanical output and produce an AC power output at a frequency related to the rotational rate of the first rotational shaft of the differential; a rectifier coupled with the AC alternator, the rectifier operable to convert the AC power output to a second DC power output combinable with the first DC power output of the DC motor/generator; a drivetrain configured to; receive and use the first and second power output to drive the traction device in a forward mode; and generate power directed to the motor/generator to drive the engine when the traction device is operated in a dynamic braking mode. - View Dependent Claims (18)
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Specification