Working machine
First Claim
1. A hybrid type construction machine comprising:
- a running mechanism;
an upper rotation body which is rotatably disposed on the running mechanism;
a working motor which is driven by an operator'"'"'s operation;
a first inverter circuit one end of which is connected to a terminal of the working motor;
a DC voltage converter one end of which is connected to the other end of the first inverter circuit, the DC voltage converter includes a reactor;
an electrical storage device which is connected to the other end of the DC voltage converter; and
a first cooling liquid circulating system which includes a first heat exchanger and cools the reactor.
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Accused Products
Abstract
Provided is a working machine capable of decreasing a voltage of a DC busbar (DC bus) with a configuration suppressing a degradation in reliability. A hybrid type construction machine as a working machine includes: a DC bus which is connected to a rotation motor via an inverter circuit, a battery which is connected to the DC bus via a step-up/step-down converter and a switch, a controller which drives the inverter circuit and the step-up/step-down converter, a cooling liquid circulating system which includes a pump motor, and an inverter circuit which is connected to the DC bus and driving the pump motor. The controller includes a mode used for decreasing the voltage of the DC bus, and in that mode, the switch enters a disconnection state and the inverter circuit is operated to consume electricity in the pump motor.
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Citations
14 Claims
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1. A hybrid type construction machine comprising:
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a running mechanism; an upper rotation body which is rotatably disposed on the running mechanism; a working motor which is driven by an operator'"'"'s operation; a first inverter circuit one end of which is connected to a terminal of the working motor; a DC voltage converter one end of which is connected to the other end of the first inverter circuit, the DC voltage converter includes a reactor; an electrical storage device which is connected to the other end of the DC voltage converter; and a first cooling liquid circulating system which includes a first heat exchanger and cools the reactor. - View Dependent Claims (2, 3, 4, 5, 6)
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7. A hybrid type construction machine comprising:
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a running mechanism; an upper rotation body which is rotatably disposed on the running mechanism; an internal combustion engine which is disposed on the upper rotation body; a working motor which is driven by an operator'"'"'s operation; a first cooling liquid circulating system which includes a first heat exchanger cooling the internal combustion engine; a first inverter circuit one end of which is connected to a terminal of the working motor; an electrical storage device which is connected to the other end of the first inverter circuit via a DC voltage converter; and a second cooling liquid circulating system which is provided separately from the first cooling liquid circulating system to cool the first inverter circuit and the DC voltage converter, second cooling liquid circulating system includes a second heat exchanger. - View Dependent Claims (8, 9, 10)
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11. A hybrid type construction machine comprising:
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an internal combustion engine; an electrical generator which is connected to the internal combustion engine; an electrical storage device which is connected to the electrical generator; an AC electric motor which drives a working component; a first inverter circuit which is connected between the electrical storage device and the AC electric motor and drives the AC electric motor; a second inverter circuit which is connected between the electrical storage device and the electrical generator and controls the operation of the electrical generator, a casing which has a sealing structure; a first CPU which is provided inside the casing and controls the first inverter circuit; a second CPU which is provided inside the casing and controls the second inverter circuit; and a cooling pipe which is thermally coupled to the first and second CPUs and cools the first and second CPUs by introducing a cooling liquid from the outside of the casing. - View Dependent Claims (12, 13, 14)
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Specification