发明名称 |
Method of detecting state of synchronization loss in stepping motor |
摘要 |
In a method of detecting synchronization loss in a stepping motor, a means for applying either control current or control voltage to a coil (4) of each phase to thereby drive a stepping motor (1) and a means for individually measuring a back EMF voltage (V) induced at the coil (4) of each phase are employed, wherein application of either the control current or the control voltage at the coil (4) of each phase is halted by turns phase by phase for such a short time period (t) as not to affect rotation of a rotor (3) of the stepping motor (1) at a predetermined timing within one step period (stp) of the rotor (3), the back EMF voltage (V) at the coil (4) is measured during the short time period (t), and the stepping motor (1) is judged to lose synchronization when the measurement result of the back EMF voltage (V) at the coil (4) of at least one phase satisfies a predetermined detection criterion. |
申请公布号 |
EP2110942(A2) |
申请公布日期 |
2009.10.21 |
申请号 |
EP20090005045 |
申请日期 |
2009.04.06 |
申请人 |
MINEBEA CO., LTD. |
发明人 |
TAKADA, KAZUO;MATSUI, TAKAYUI;MIYAJI, HARUKA |
分类号 |
H02P8/38;H02P8/32;H02P8/34;H02P8/36 |
主分类号 |
H02P8/38 |
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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