| 发明名称 |
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| 摘要 |
<p>An output current of a voltage-type inverter (INV) is detected by a current transformer (4) and is then detected by a comparator (6) to see if it has exceeded a predetermined limit value. The detected output current is supplied to a vector analyser (8) to detect the position of the output current vector. A zone discriminator (9) discriminates in which zone the vector is positioned. In response to the zone discrimination output, an output pattern generator (10) produces a switching pattern corresponding to a voltage vector the closest to the vector in a direction opposite to the output current vector. When it is detected by the comparator (6) which controls the selector (2) that the magnitude of the output current vector has exceeded a limit value, the switching pattern from the output pattern generator (10) is taken out from the selector (2) and is supplied to the inverter (INV). The output current vector changes toward a direction to decrease the current irrespective of the drive/control condition of the motor (IM) which is the load of the inverter (INV), position of the vector of counter em, and position of the voltage vector selected at that moment.</p> |
| 申请公布号 |
EP0588388(A3) |
申请公布日期 |
1994.04.13 |
| 申请号 |
EP19930119717 |
申请日期 |
1989.08.30 |
| 申请人 |
FUJI ELECTRIC CO., LTD. |
发明人 |
MINOWA, HIROFUMI;YAMAZOE, MASARU;YANASE, TAKAO;ISHII, SHIN'ICHI';NAGAO, YOSHINOBU |
| 分类号 |
H02M7/48;H02M7/5387;H02P27/06;H02P27/08;(IPC1-7):H02P7/628;H02M7/538;H02H7/08 |
主分类号 |
H02M7/48 |
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