An electric work machine (1) includes: an inner-rotor-type brushless motor (6) having a stator (20) disposed around a rotor (30); and an output part (10), which is directly or indirectly driven by the rotor. The rotor comprises a rotor core (32) and eight permanent magnets (33) fixed to the rotor core. The stator comprises a stator core (21), one or more insulators (22, 23) fixed to the stator core, and six coils (24), which are respectively wound on teeth (21T) of the stator core via the insulator(s).

An electric work machine (1) includes: an inner-rotor-type brushless motor (6) having a stator (20) disposed around a rotor (30); and an output part (10), which is directly or indirectly driven by the rotor. The rotor comprises a rotor core (32) and eight permanent magnets (33) fixed to the rotor core. The stator comprises a stator core (21), one or more insulators (22, 23) fixed to the stator core, and six coils (24), which are respectively wound on teeth (21T) of the stator core via the insulator(s).

A stator assembly including a frame structure having a stator teeth being circumferentially distributed around a longitudinal axis, wherein in between respective two neighboring stator teeth there is formed one stator slot; a winding system having a plurality of electric windings, wherein respectively one electric winding is wound around at least one stator tooth and is partially accommodated within two stator slots and each electric winding comprises an end winding portion which axially protrudes from the frame structure; and an insulation arrangement having a plurality of electric insulation devices, each insulation device surrounding a part of one electric winding is provided. Each insulation device includes an inner insulation portion being accommodated within the respective stator slot and an outer insulation portion protruding from the frame structure and surrounding a part of the respective end winding portion. The outer insulation portion includes an outer surface which includes elevated surface portions.

A method for manufacturing an electromagnetic coil with an intentionally engineered heat flow path is provided. The method includes defining at least one preferential heat flow path for heat to flow for the electromagnetic coil. A coil cartridge in which to encase the electromagnetic coil is designed by selecting dimensions of different portions of the insulating coil cartridge that will result in the at least one preferential heat flow path. The electromagnetic coil is then encased in coil cartridge material to produce an encased electromagnetic coil.

In a rotating electrical machine, a magnet unit and an armature core member are configured to satisfy the following relation Br×Ma≤Bsc×Wsc. In the relation, Br represents a remanent flux density of the magnet unit, Ma represents a distance of a farther circumferential surface of each of first magnets in the circumferential direction, Bsc represents a saturation magnetic flux density of the armature core member, and Wsc represents a thickness of the armature core member in a radial direction thereof.

Provided are a stator having insulating paper positioned and fixed using an inexpensive and simple structure, a motor having the stator, and a method for manufacturing the stator. The stator 18 of a motor is provided with a stator core 26 haying a plurality of slots 16, a plurality of coils 32 positioned in the slots, pieces of coil end insulating paper 40 that are positioned between a plurality of coil ends 44 and that insulate the coil ends 44 from each other, and a plurality of pieces of intercoil insulating paper 34 positioned in the slots 16, each of the plurality of pieces of intercoil insulating paper 34 having a projection 38 projecting from an axial end part 36 of the stator core. Each of the pieces of coil end insulating paper 40 has an adhesive part 42, and a plurality of projections 38 are affixed into a single piece of coil end insulating paper 40.

Provided are a stator having insulating paper positioned and fixed using an inexpensive and simple structure, a motor having the stator, and a method for manufacturing the stator. The stator 18 of a motor is provided with a stator core 26 haying a plurality of slots 16, a plurality of coils 32 positioned in the slots, pieces of coil end insulating paper 40 that are positioned between a plurality of coil ends 44 and that insulate the coil ends 44 from each other, and a plurality of pieces of intercoil insulating paper 34 positioned in the slots 16, each of the plurality of pieces of intercoil insulating paper 34 having a projection 38 projecting from an axial end part 36 of the stator core. Each of the pieces of coil end insulating paper 40 has an adhesive part 42, and a plurality of projections 38 are affixed into a single piece of coil end insulating paper 40.

An electric machine includes a stator core defining a plurality of slots, slot liners disposed within the slots and covering inner surfaces of the slots, and windings wound within and between the slots. Each of the slot liners has an end extending away from a face of the stator core and defining a flange that includes a rim in direct contact with the face and a terminating lip that is wider than the rim such that the rim is between the face and the terminating lip.

A stator for a brushless DC (BLDC) motor includes a stator core having stator teeth extending radially inwardly towards a center bore, stator windings respectively wound around the stator teeth, and insulating inserts having substantially the same longitudinal length as the stator core. The insulating inserts are longitudinally received between adjacent stator windings at or near inner tips of the adjacent stator teeth to substantially seal the center bore of the stator assembly from the stator windings.

A stator for a brushless DC (BLDC) motor includes a stator core having stator teeth extending radially inwardly towards a center bore, stator windings respectively wound around the stator teeth, and insulating inserts having substantially the same longitudinal length as the stator core. The insulating inserts are longitudinally received between adjacent stator windings at or near inner tips of the adjacent stator teeth to substantially seal the center bore of the stator assembly from the stator windings.