发明名称 |
Method of estimating a rotor position of synchronous motor, method of controlling synchronous motor with no position sensor and a controller of synchronous motor |
摘要 |
In a method of accurately estimating the rotor position of a synchronous motor having saliency from observable quantities, a control system for adjusting an output frequency of an inverter on the basis of a value of axis shift of the synchronous motor to operate the motor synchronously with the output frequency is provided with an induced voltage estimating/axis shift operating unit. Currents resulting from conversion of detection currents on a control axis, voltage commands to be inputted to an inverse converter and a speed command are inputted to the operating unit to estimate an induced voltage of the motor 2 and determine the axis shift from a phase of the estimated induced voltage. By using an electrical constant Lq of inductance, a voltage drop across the inductance is determined by the product of a motor speed command and magnitude of motor current. The voltage drop is a virtual quantity that does not depend on the motor rotor position. A vector of the virtual quantity is so introduced as not to change a phase of the original induced voltage.
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申请公布号 |
US6396229(B1) |
申请公布日期 |
2002.05.28 |
申请号 |
US20000654086 |
申请日期 |
2000.09.01 |
申请人 |
HITACHI, LTD. |
发明人 |
SAKAMOTO KIYOSHI;ENDOU TSUNEHIRO;TAKAHASHI NAOHIKO;MIURA HARUO;FUJII HIROSHI |
分类号 |
H02P6/18;H02P21/00;H02P21/14;H02P27/04;H02P27/06;(IPC1-7):H02P6/18 |
主分类号 |
H02P6/18 |
代理机构 |
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代理人 |
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主权项 |
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地址 |
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