TURNING JOINT FOR ELECTRIC EXCAVATOR
First Claim
1. A turning joint for an electric excavator, comprising:
- a DC/AC converter positioned at an upper swing structure of the excavator and configured to convert DC electric energy of an electric energy storage device into AC electric energy;
an upper coil wound around the upper swing structure and configured to transfer an AC component converted by the DC/AC converter to a lower traveling structure by electromagnetic induction;
a lower coil wound around the lower traveling structure and configured to receive an electromotive force of the AC component transferred from the upper coil; and
an inverter configured to supply the electromotive force of the AC component transferred from the lower coil to an electric motor for traveling the lower traveling structure, as power required for operation of the electric motor.
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Accused Products
Abstract
The present invention relates to a turning joint for an electric excavator, which includes a direct current/alternating current convertor, an upper coil, a lower coil, and an inverter. A turning joint for an electric excavator (or a hybrid excavator) uses the principle of a transformer to transmit electric energy from the upper portion of the excavator to a travelling body in the lower portion thereof. Thus, even while an upper rotator body of an electric excavator performs a rotating operation, electric power can be supplied to a travelling electric motor in the lower portion of the electric excavator, to thereby perform a travelling operation.
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Citations
3 Claims
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1. A turning joint for an electric excavator, comprising:
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a DC/AC converter positioned at an upper swing structure of the excavator and configured to convert DC electric energy of an electric energy storage device into AC electric energy; an upper coil wound around the upper swing structure and configured to transfer an AC component converted by the DC/AC converter to a lower traveling structure by electromagnetic induction; a lower coil wound around the lower traveling structure and configured to receive an electromotive force of the AC component transferred from the upper coil; and an inverter configured to supply the electromotive force of the AC component transferred from the lower coil to an electric motor for traveling the lower traveling structure, as power required for operation of the electric motor. - View Dependent Claims (2, 3)
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Specification