发明名称 |
STYRKOPPLING FOR SJELVSTARTANDE LIKSTROMSMOTOR UTAN BORSTAR |
摘要 |
The present invention relates to a control circuit for a brushless self-starting D.C. motor. The motor comprises a permanent magnet rotor and a stator coil. A component is provided which is magnetic field-dependent and which is subjected to the rotor field to determine the rotary position. A controllable electronic servo-element is connected in series with the stator coil at a D.C. source. The servoelement controls the flux through the stator coil in dependence on the rotary position of the rotor. The magnetic dependent parameter changes of the magnetic field-dependent component are converted to a control signal for the servo-element. The control circuit comprises an oscillator having an LC resonant circuit of which the inductance is formed by the magnetic field-dependent component in the form of a sensing coil having a core. The oscillations of the oscillator are modulated in response to the induction generated in the sensing coil by the rotor field. The control signal for the servo-element is derived from the modulated oscillator output and the oscillator frequency is considerably higher than the rotor speed of the D.C. motor. |
申请公布号 |
SE424493(B) |
申请公布日期 |
1982.07.19 |
申请号 |
SE19760006936 |
申请日期 |
1976.06.17 |
申请人 |
DANFOSS AS |
发明人 |
A B * GOSLING;B E * MEALING |
分类号 |
H02P6/16;H02P6/14;(IPC1-7):02P6/02 |
主分类号 |
H02P6/16 |
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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