| 摘要 |
An electromagnetic control motor device, particularly a ratio metre is disclosed, of the type including: a control coil assembly (10, 20), a frame (50) for supporting the coil assembly (10, 20), a magnet device rotatably driven by said control coil assembly (10, 20) and a magnetic shield (100) surrounding at least partially the coil assembly (10, 20) and support frame, characterised in that said shield (100) has an annular non-right cylindrical skirt (110).
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