发明名称 |
STEPPER MOTOR CONTROLLER |
摘要 |
A stepper motor control circuit reduces ripple current by applying both fast and slow current decays to a motor phase when current is being reduced in th e motor phase while following a falling current waveform. The control circuit uses an initial fast decay to reduce a winding current and then switches to a slow decay until a winding current is sampled again. The control circuitry samples a winding current and compares the sampled current to a reference current to determine if current is to be applied or reduced using fast and/o r slow decay methods. Different phase current sample circuits allow either constant current sensing or selective current sensing.
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申请公布号 |
CA2461820(A1) |
申请公布日期 |
2003.04.10 |
申请号 |
CA20022461820 |
申请日期 |
2002.10.02 |
申请人 |
ABBOTT LABORATORIES |
发明人 |
WANG, BING;WALKER, DONNY R.;ROTH, BRIAN J. |
分类号 |
H02P8/12;H02P8/18;H02P8/22;(IPC1-7):H02P8/18 |
主分类号 |
H02P8/12 |
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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