US 10,951,152 B2Granted

Power conversion apparatus

AssigneeDaikin Industries, Ltd.

InventorsNobuo Hayashi, Takurou Ogawa, Daisuke Ueki, Morimitsu Sekimoto

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Abstract

In order to suppress vibration with a motor a load torque of which periodically fluctuates, an output torque of the motor is controlled to be periodically changed. In this case, in order to increase a vibration suppressing component by a direct power conversion apparatus, at least one of first control and second control is performed. In the first control, an output torque having a waveform including a fundamental frequency component of the load torque a fundamental frequency of which is a frequency in accordance with a fluctuation period of the load torque and at least one of a fourth harmonic and a sixth harmonic of a power source frequency of an AC power source is generated. In the second control, the output torque having a waveform including at least one of a second harmonic and a third harmonic of the fundamental frequency of the load torque and a second harmonic of the power source frequency of the AC power source is generated.

Claims9

Dependent claims

A direct power conversion apparatus comprising:

a converting unit that includes a plurality of switching elements and that converts an AC power supplied from a single-phase AC power source to a three-phase AC power at a predetermined frequency and supplies the three-phase AC power to a motor a load torque of which periodically fluctuates;
and
a control unit that controls switching operations of the switching elements,
wherein the control unit performs at least one of first control and second control,
the first control being control for generating an output torque of the motor having a waveform including
a fundamental frequency component of the load torque a fundamental frequency of which is a frequency in accordance with a fluctuation period of the load torque and
at least one of a fourth harmonic and a sixth harmonic of a power source frequency of the AC power source,
the second control being control for generating the output torque having a waveform including
at least one of a second harmonic and a third harmonic of the fundamental frequency of the load torque and
a second harmonic of the power source frequency of the AC power source.

7 more elements

Dependencies are inferred from the claim text.

Facts

Application: 17/021,048Filed 15 Sep 2020 · continuation
Priority: JP JP2018-06440129 Mar 2018
Published: US 2020/0412292 A131 Dec 2020
Granted: 16 Mar 2021
Term ends: Not estimatedThe source records don’t support an estimate.

Classification11 codes

H02M 1/15
Arrangements for reducing ripples from DC input or output: using active elements
H02P 27/08
Using DC to AC converters or inverters: with pulse width modulation
H02M 1/143
Arrangements for reducing ripples from DC input or output: using compensating arrangements
H02M 5/458
Using devices of a triode or transistor type requiring continuous application of a control signal: using semiconductor devices only