Power converter
AssigneeDaikin Industries, Ltd.
InventorsYueqiang Zhou, Toshiyuki Maeda
Life of this patent
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Abstract
In a power converter, vibration and noise of a motor due to pulsation of a direct current link voltage are reduced. An inverter circuit is provided, which is configured to convert a direct current link voltage having a pulsating component to an alternating current to output the alternating current to a permanent magnet synchronous motor. A controller is provided, which is configured to control the inverter circuit by vector control and which, in a control state in which fundamental voltage vectors do not include a zero vector (voltage vector for which a motor terminal voltage is zero), performs such control that the phase of a resultant voltage vector of a d-axis voltage vector and a q-axis voltage vector of the permanent magnet synchronous motor varies depending on pulsation.
Claims20
A power converter comprising:
- a direct current supply configured to convert an input alternating current to a direct current link voltage having a pulsating component,
- an inverter circuit configured to convert, by switching, the direct current link voltage having a pulsating component received from the direct current supply, to an alternating current output having a predetermined frequency and a predetermined voltage to output the alternating current output to a permanent magnet synchronous motor;
- and
- a controller configured to
- control the inverter circuit by vector control for combining fundamental voltage vectors to control the switching, and
- in a control state in which the fundamental voltage vectors do not include a zero vector which is a voltage vector for which a motor terminal voltage is zero, perform such control that a phase of a resultant voltage vector from a q-axis varies depending on the pulsating component, the resultant voltage vector being a resultant voltage vector of a d-axis voltage vector and a q-axis voltage vector of the permanent magnet synchronous motor.
Dependencies are inferred from the claim text.