US9680406B2 · US · B2
| Field | Value |
|---|---|
| Publication number | US-9680406-B2 |
| Application number | US-201414198189-A |
| Country | US |
| Kind code | B2 |
| Filing date | Mar 5, 2014 |
| Priority date | Jul 24, 2006 |
| Publication date | Jun 13, 2017 |
| Grant date | Jun 13, 2017 |
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Official abstract text for this publication.
A variable-flux motor drive system including a permanent-magnet motor including a permanent magnet, an inverter to drive the permanent-magnet motor, and a magnetize device to pass a magnetizing current for controlling flux of the permanent magnet. The permanent magnet is a variable magnet whose flux density is variable depending on a magnetizing current from the inverter. The magnetize device passes a magnetizing current that is over a magnetization saturation zone of magnetic material of the variable magnet. This system improves a flux repeatability of the variable magnet and a torque accuracy.
Opening claim text (preview).
The invention claimed is: 1. A drive system comprising: an inverter for driving a motor having a first permanent magnet and a second permanent magnet, wherein magnetic characteristic of the second permanent magnet is varied based on a specific magnetic field; a magnetization coil for generating the specific magnetic field; and a magnetization unit for generating a magnetization current when a magnetizing current command is received, wherein the magnetization unit includes, a second inverter for generating the magnetization current; a power source for supplying an electric power to the second inverter; and a control unit for generating a gate signal so as to control the second inverter to generate the magnetization current. 2. The drive system according to claim 1 , wherein the magnetization unit further include a current detector for detecting a current value of the magnetization current generated by the second inverter, and the control unit generates the gate signal based on the magnetizing current command and the detected magnetization current.
Estimation or adaptation of motor parameters, e.g. rotor time constant, flux, speed, current or voltage · CPC title
Magnets embedded in the magnetic core, e.g. interior permanent magnets [IPM] · CPC title
Controlling the motor by varying the switching frequency of switches connected to a DC supply and the motor phases · CPC title
Direct field-oriented control; Rotor flux feed-back control · CPC title
with permanent magnets and field winding both rotating · CPC title
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