STARTER

To provide a starter which can cope with a high voltage of a power supply without being accompanied by size enlargement and a size increase.SOLUTION: A starter for starting an internal combustion engine comprises a DC series motor in which a field coil (2a) which is constituted by combining a plurality of field coil units and an armature (2c) are electrically and serially connected to each other. The field coil (2a) is arranged between the armature (2c) and a positive electrode terminal of a power supply (5), and when setting the combined resistance of the field coil (2a) as Rf[Ω], setting the armature resistance of the armature (2c) as Ra[Ω], and setting an output voltage of the power supply (5) as Vb[V], a relationship of [Vb×Ra/(Rf+Ra)≤12] is established.SELECTED DRAWING: Figure 2 【課題】大型化とコスト増大を伴うことなく、電源の高電圧化に対応できるスタータを提供する。【解決手段】内燃機関を始動させるスタータで会って、複数の界磁コイル単体を組合わせて構成した界磁コイル（２ａ）と電機子（２ｃ）とが、電気的に直列に接続された直流直巻モータを備え、界磁コイル（２ａ）は、電機子（２ｃ）と電源（５）の正極端子との間に配置され、界磁コイル（２ａ）の合成抵抗をＲｆ［Ω］、電機子（２ｃ）の電機子抵抗をＲａ［Ω］、電源（５）の出力電圧をＶｂ［Ｖ］としたとき、［Ｖｂ×Ｒａ／（Ｒｆ＋Ｒａ）≦１２］ の関係が成り立つように構成されている。【選択図】図２