Abstract: An insulated wire including: a linear conductor; and an insulating layer that covers an outer peripheral surface of the conductor, wherein the insulating layer contains, as residual solvents, a first solvent having a relative permittivity of 15 or more and a second solvent having a relative permittivity of less than 15, a first ratio that is a ratio of a content of the second solvent to a total content of the first solvent and the second solvent contained in the insulating layer is 50% by mass or more, and a second ratio that is a ratio of the content of the second solvent to the total content of the first solvent and the second solvent contained in the insulating layer after a heating treatment of heating the insulated wire at 350° C. for 1 minute is higher than the first ratio.

Abstract: A controller for determining degradation of the motor, the controller includes a first acquisition unit for acquiring an impedance between the coil and the core, an estimation unit for estimating the total amount of heat input to the motor based on the magnitude of the impedance between the coil and the core, and a determination unit for determining the remaining life due to thermal degradation of the motor based on the total amount of heat input estimated by the estimation unit.

Abstract: The electric tractor is equipped with a battery, a transmission unit, a machine body frame, a rear axle unit, and a front axle unit. The transmission unit shifts the input power and outputs the shifted input power. The machine body frame is fixed to the transmission unit. The rear axle unit supports the rear wheels, and transmits, to the rear wheels, the power output from the transmission unit. The front axle unit supports the front wheels. The rear axle unit and the front axle unit support chassis including the machine body frame and transmission unit. The battery is supported by the chassis.

Abstract: A method for manufacturing a stator operatively associated with an inner and outer circumferential jigs including sequentially ordered steps of inserting segment coils, each constituting of a pair of straight portions connected with a connecting portion in a U-like shape, in slots of a stator core, rotating a twisting ring while distal end parts of the pairs of straight portions protruding on an opposite side to the connecting portions are engaged with ring grooves of the twisting ring to twist and shape in one direction the distal end parts located in odd-numbered positions from an outer circumferential side or an inner circumferential side in a radial direction and twist and shape the distal end parts located in even-numbered positions in an opposite direction to the one direction, and welding the distal end parts twisted in the one direction and the distal end parts twisted in the opposite direction.

Abstract: The stator includes a stator core, a plurality of phase windings, a neutral line and a fixing member. The plurality of phase windings are wounded a plurality of times by a predetermined winding method crossing between a plurality of slots. One lead end of each phase winding is supplied with a phase current. The other lead end of each phase winding is a neutral point connecting portion. The other lead end is pulled out from an axially end portion of the stator core. The neutral line connects the neutral point connecting portions of the phase windings of different phases together. The neutral line is separate from the phase windings. The fixing member fixes the neutral line to a yoke portion via an intermediate member. The intermediate member is made of resin.

Abstract: In a stator, segment coils each consisting of a pair of straight portions connected with a connecting portion in a U-like shape are set in slots of a stator core. Each straight portion has distal end parts protruding on an opposite side to the connecting portions.

Abstract: The stator includes a stator core, a plurality of phase windings, a neutral line and a fixing member. The plurality of phase windings are wounded a plurality of times by a predetermined winding method crossing between a plurality of slots. One lead end of each phase winding is supplied with a phase current. The other lead end of each phase winding is a neutral point connecting portion. The other lead end is pulled out from an axially end portion of the stator core. The neutral line connects the neutral point connecting portions of the phase windings of different phases together. The neutral line is separate from the phase windings. The fixing member fixes the neutral line to a yoke portion via an intermediate member. The intermediate member is made of resin.

Abstract: In a stator, segment coils each consisting of a pair of straight portions connected with a connecting portion in a U-like shape are set in slots of a stator core. Each straight portion has distal end parts protruding on an opposite side to the connecting portions. The distal end parts in odd-numbered positions from an outer or inner circumferential side in a radial direction are twisted in one direction and shaped radially outward and the distal end parts located in even-numbered positions are twisted in an opposite direction to the one direction and shaped radially inward to be joined to each other on the same circumference by welding.