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US 2025/0192709 A1Published application
Motor driving device and cooling cycle device
AssigneeCarrier Japan Corporation
InventorsYoshitaka Uchiyama, Masaki Kanamori
Life of this patent
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Abstract
This motor driving apparatus comprises a first inverter, a second inverter, a plurality of opening and closing connections, a plurality of semiconductor switch elements, and a controller. The controller, at the opening or closing of the opening and closing connections, executes a pseudo neutral point operation and turns on the semiconductor switch elements in advance. First wirings each have a first inductance, second wirings each have a second inductance, and third wirings each have a third inductance. The third inductance value is smaller than the total of the first inductance value and the second inductance value.
Claims19
A motor drive apparatus of a motor including a plurality of phase wires disconnected to each other, the motor drive apparatus comprising:
- a first inverter including a plurality of series circuits of upper switch elements and lower switch elements, both ends of the series circuits being connected to a DC power supply, an interconnection point of the upper switch element and the lower switch element of each of the series circuits being connected to one end of each of the phase wires;
- a second inverter including a plurality of series circuits of upper switch elements and lower switch elements, both ends of the series circuits being connected to the DC power supply, an interconnection point of the upper switch element and the lower switch element of each of the series circuits being connected to the other end of each of the phase wires by each of first wires;
- a plurality of switching contacts connected between the other ends of each of the phase wires by each of second wires;
- a plurality of semiconductor switch elements connected in parallel to each of the switching contacts by each of third wires;
- and
- a controller controlling drive of the first inverter, drive of the second inverter, and opening and closing of each of the switching contacts, wherein
- when opening and closing each of the switching contacts, the controller executes a pseudo-neutral point operation of alternately turning on and off all the upper switch elements and all the lower switch elements in the second inverter and turns on each of the semiconductor switch elements, in advance,
- each of the first wires has a first inductance,
- each of the second wires has a second inductance,
- each of the third wires has a third inductance, and
- a value of the third inductance is smaller than a total value of the value of the first inductance and the value of the second inductance.
8 more elements
A motor drive apparatus of a motor including a plurality of phase wires disconnected to each other, the motor drive apparatus comprising:
- a first inverter including a plurality of series circuits of upper switch elements and lower switch elements, both ends of the series circuits being connected to a DC power supply, an interconnection point of the upper switch element and the lower switch element of each of the series circuits being connected to one end of each of the phase wires;
- a second inverter including a plurality of series circuits of upper switch elements and lower switch elements, both ends of the series circuits being connected to the DC power supply, an interconnection point of the upper switch element and the lower switch element of each of the series circuits being connected to the other end of each of the phase wires by each of first wires;
- a plurality of semiconductor switch elements connected between other ends of the respective phase wires by each of second wires and each of third wires;
- a plurality of switching contacts connected in parallel to each of the semiconductor switch elements by each of fourth wires;
- and
- a controller controlling drive of the first inverter, drive of the second inverter, and opening and closing of each of the switching contacts, wherein
- when opening and closing each of the switching contacts, the controller executes a pseudo-neutral point operation of alternately turning on and off all the upper switch elements and all the lower switch elements in the second inverter and turns on each of the semiconductor switch elements, in advance,
- each of the first wires has a first inductance,
- each of the second wires has a second inductance,
- each of the third wires has a third inductance, and
- a value of the third inductance is smaller than a total value of the value of the first inductance and the value of the second inductance.
8 more elements
A motor drive apparatus of a motor including a plurality of phase wires disconnected to each other, the motor drive apparatus comprising:
- a first inverter including a plurality of series circuits of upper switch elements and lower switch elements, both ends of the series circuits being connected to a DC power supply, an interconnection point of the upper switch element and the lower switch element of each of the series circuits being connected to one end of each of the phase wires;
- a second inverter including a plurality of series circuits of upper switch elements and lower switch elements, both ends of the series circuits being connected to the DC power supply, an interconnection point of the upper switch element and the lower switch element of each of the series circuits being connected to the other end of each of the phase wires by each of first wires;
- a plurality of switching contacts connected between the other ends of each of the phase wires by each of second wires;
- a plurality of semiconductor switch elements connected in parallel to each of the switching contacts by each of third wires;
- and
- a controller controlling drive of the first inverter, drive of the second inverter, and opening and closing of each of the switching contacts, wherein
- when opening and closing each of the switching contacts, the controller executes a pseudo-neutral point operation of alternately turning on and off all the upper switch elements and all the lower switch elements in the second inverter and turns on each of the semiconductor switch elements, in advance,
- each of the first wires has a length,
- each of the second wires has a length,
- each of the third wires has a length, and
- in all the third wires, a length of the third wire is shorter than a total value of a length of the first wire connected to the third wire and a length of the second wire.
8 more elements
Dependencies are inferred from the claim text.