发明名称 |
Phase locked stepper motor controlled light chopper |
摘要 |
A phase locked loop stepper motor controlled light chopper for providing a specific pattern reversal rate. The stepper motor controlled light chopper includes a phase comparator for comparing the phase of a reference signal to the phase of a comparison signal; a RC low pass filter for filtering the output of the phase comparator; a voltage controlled oscillator having a frequency varying in response to the output of the RC filter. The chopper also includes a binary counter for generating count signals responsive to the frequency of the voltage controlled oscillator; a divide by 10 circuit counting one of the outputs of the binary counter and providing the comparison signal. The light chopper also includes a memory circuit for storing an eight state four bit gray code for driving a four phase stepper motor as a chopper wheel in a specified pattern mounted on a drive shaft.
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申请公布号 |
US4631466(A) |
申请公布日期 |
1986.12.23 |
申请号 |
US19850727156 |
申请日期 |
1985.04.25 |
申请人 |
WESTINGHOUSE ELECTRIC CORP. |
发明人 |
SHERWIN, GARY W. |
分类号 |
H02P8/14;A61B3/103;G02B26/04;(IPC1-7):H02P8/00 |
主分类号 |
H02P8/14 |
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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