Electricity: motive power systems – Braking – Dynamic braking
Reexamination Certificate
2008-09-15
2011-11-08
Ro, Bentsu (Department: 2837)
Electricity: motive power systems
Braking
Dynamic braking
C318S143000, C318S153000, C318S146000, C318S375000, C318S376000, C322S016000
Reexamination Certificate
active
08054016
ABSTRACT:
A cooling system for a retarding system of an electric drive machine (100) includes a direct current (DC) link having first and second rails. A first resistor grid (214) is selectively placed in circuit between the rails by an automatic switch (216) in response to a switch (216) signal. A second resistor grid (218) is selectively placed in circuit between the rails by a chopper circuit (220) connected in series with the second resistor grid (218). The chopper modulates a current passing therethrough based on a duty cycle. A motor (336) is in parallel electrical connection across a portion of the first resistor grid (214) and operates in response to a motor (336) signal. An electronic controller (400) calculates a net energy during operation and adjusts the switch (216) signal, the duty cycle, and the motor (336) signal to close the automatic electrical switch (216) and operate the motor (336) when the net energy exceeds a threshold value.
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Gottemoller Benjamin P.
Lengyel Tamran H.
Miller Benjamin
Caterpillar Inc.
Glass Erick
Leydig & Voit & Mayer
Ro Bentsu
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