发明名称 |
Alternating-current machine drive |
摘要 |
In this context, a frequency converter generates a multiphase alternating current of variable frequency which current feeds an alternating-current machine via alternating-current lines into which for each alternating current phase line one commutating choke is integrated for limiting the change of current with respect to time di/dt. Since the efficiency of a synchronous motor is best when fed with a sinusoidal alternating current, a frequency-variable filter is provided as a bypass circuit to the synchronous motor which makes the alternating current sinusoidal within a predeterminable frequency range. The frequency of the alternating current is measured with a frequency meter and monitored for exceeding a limit in a frequency limit detector. The filter can be tuned step-by-step by means of switching signals to different frequencies by changing the inductance or capacitance of series-tuned circuits step-by-step. Undesirable harmonic frequencies can thus be attenuated with-in a relatively large frequency range.
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申请公布号 |
US4623830(A) |
申请公布日期 |
1986.11.18 |
申请号 |
US19840629464 |
申请日期 |
1984.07.10 |
申请人 |
BBC BROWN, BOVERI & COMPANY, LIMITED |
发明人 |
PENEDER, FRANZ;SUCHANEK, VOJEN |
分类号 |
H02M1/12;H02P25/02;(IPC1-7):H02P5/40 |
主分类号 |
H02M1/12 |
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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