Power converter
First Claim
1. 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 tocontrol the inverter circuit by vector control for combining fundamental voltage vectors to control the switching, andin 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.
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Accused Products
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.
8 Citations
20 Claims
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1. A power converter comprising:
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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. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13, 14, 15, 16, 17, 18, 19, 20)
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Specification