发明名称 |
METHOD FOR CONTROLLING THE STARTING OF AN AC INDUCTION MOTOR UTILIZING CLOSED LOOP ALPHA CONTROL |
摘要 |
A method is provided for controlling a three-phase, AC induction motor (12). Each phase of the AC induction motor (12) is connected to an AC input source (18) by a thyristor switch (22a-22c) and a bypass contactor (24a-24c) connected in parallel in order to provide voltage and current to the AC induction motor (12). The method includes the steps of sequentially firing pairs of thyristor switches (22a-22c) at a predetermined initial alpha firing angle. A new alpha firing angle is calculated which is dependant upon the initial alpha firing angle. Thereafter, pairs of thyristor switches (22a-22c) are fired at the new alpha firing angle. The new alpha firing angle is provided as the initial alpha firing angle and a new alpha firing angle is calculated. The process is repeated until the AC induction motor (12) reaches its full operating speed. |
申请公布号 |
WO0189072(A2) |
申请公布日期 |
2001.11.22 |
申请号 |
WO2001GB02179 |
申请日期 |
2001.05.18 |
申请人 |
EATON CORPORATION;EATON LIMITED |
发明人 |
GRITTER, DAVID, JAMES;WANG, DORA, YUAN |
分类号 |
H02P1/26 |
主分类号 |
H02P1/26 |
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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