Patent ID: 8519579

Claim:
An electric motor comprising: a stator that is provided with a cylindrical stator core having, at an inner periphery thereof, a plurality of teeth arranged circumferentially and protruding, and a stator coil inserted into slots formed between the teeth of the stator core so as to provide coil windings around one or more of the teeth; a rotor that is rotatably provided in the stator; and covers that cover, respectively, a coil end portion being a part of the stator coil and protruding outward from one axial end face of the stator core and a coil end portion being a part of the stator coil and protruding outward from the other axial end face of the stator core, and that each define therein a coolant chamber in which a coil-end-cooling coolant is liquid-tightly stored, wherein: the stator coil is a pre-wound coil having a predetermined coil form and is inserted into the slots from a radially inner side of the stator core to provide the coil windings around the one or more of the teeth; the coil end portions include a lead-wire side coil end portion provided at one axial side to which a power feed line is connected and a no-lead-wire side coil end portion provided at the other axial side; the no-lead-wire side coil end portion is shaped to protrude to a position that is closer to a rotation axis of the rotor than an inner peripheral face of the stator core is; and the coolant chamber in a no-lead-wire side where the no-lead-wire side coil end portion is present is formed liquid-tight by the cover covering the no-lead-wire side coil end portion and a seal member that is attached from or on the radially inner side of the stator core so as to cover an opening between an inner peripheral edge of the cover covering the no-lead-wire side coil end portion and an inner peripheral edge of the stator core.