Rotary machine controller
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United States of America Patent
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Jun 12, 2018
Issued Date -
Jan 14, 2016
app pub date -
Apr 10, 2013
filing date -
Apr 10, 2013
priority date (Note) -
In Force
status (Latency Note)
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Abstract
An estimation unit estimates a q-axis induced-voltage estimation value and estimation torque of a PM motor. An adder adds a torque command and a first command together. The first command is calculated at a first command generation unit based on the estimation torque. A further adder adds a q-axis voltage command and a second command together. The second command is calculated at a second command generation unit based on the q-axis induced-voltage estimation value. The first and second command generation units compensate a control delay in a current control system including a current control unit and an estimation delay in the estimation unit for the estimation torque and an estimation induced voltage of the PM motor, and thereby a lack of the q-axis voltage command in a high frequency range is compensated, reducing a torque ripple effectively over a wide range of speed up to a high speed range.
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