| 摘要 |
PROBLEM TO BE SOLVED: To reduce the influence of temperature characteristics on the accuracy of a resolver when the ambient temperature is low.SOLUTION: On an annular stator core 2, a plurality of teeth 21 extended inward in a radial direction from an inner peripheral edge 20 of the annular stator core 2 while being spaced apart from each other in the circumferential direction are provided. Each tooth 21 is wound with a stator coil 4 after forming a resin mold 3 described later for forming an annular insulating cover. On the surface of an annular part 23 at a position where each tooth 21 is extended, PTC heaters 6 which are respectively well known are fixed with adhesive or the like to be provided so as to correspond to the teeth 21. The PTC heater 6 is provided so as to heat the stator coil 4. The temperature of the PTC heater 6 is maintained in a predetermined range. Each stator coil 4 located near each PTC heater 6 is heated at a temperature in the predetermined range, respectively.SELECTED DRAWING: Figure 1 |
