In one possible implementation, a motor is provided including a rotor and a stator. Front cooling fins are thermally coupled to a front of the stator, and rear cooling fins are thermally coupled to a rear portion of the stator. The winding is between the front and rear cooling fins.

In one possible implementation, a motor is provided including a rotor and a stator. Front cooling fins are thermally coupled to a front of the stator, and rear cooling fins are thermally coupled to a rear portion of the stator. The winding is between the front and rear cooling fins.

Magnet wire improved partial discharge performance may include a conductor, a first layer of polymeric enamel insulation formed around the conductor, and a second layer of polymeric enamel insulation formed around the first layer. The second layer may be a semi-conductive layer that includes a base polymeric material and filler particles dispersed within the base polymeric material. Additionally, at least sixty percent by weight of the filler particles may be positioned in an outer half of a thickness of the second layer.

Magnet wire improved partial discharge performance may include a conductor, a first layer of polymeric enamel insulation formed around the conductor, and a second layer of polymeric enamel insulation formed around the first layer. The second layer may be a semi-conductive layer that includes a base polymeric material and filler particles dispersed within the base polymeric material. Additionally, at least sixty percent by weight of the filler particles may be positioned in an outer half of a thickness of the second layer.

In one possible embodiment, an aircraft electric motor cooling system is provided having an airflow path through a spinner which includes a first airflow path between an inner rotor and a stator, a second airflow path between an outer rotor the stator and a third airflow path along an outer surface of the outer rotor.

In one possible embodiment, an aircraft electric motor cooling system is provided having an airflow path through a spinner which includes a first airflow path between an inner rotor and a stator, a second airflow path between an outer rotor the stator and a third airflow path along an outer surface of the outer rotor.

The invention relates to an insulated conductor comprising an elongate conductor provided with an insulating layer which comprises a polymeric material. Said polymeric material has a crystallinity of at least 25% and includes a repeat unit of general formula

##STR00001##

wherein t1 and w1 independently represent 0 or 1 and v1 represents 0, 1 or 2. The insulating layer has a thickness in the range 2 μm-300 μm.

The invention relates to an insulated conductor comprising an elongate conductor provided with an insulating layer which comprises a polymeric material. Said polymeric material has a crystallinity of at least 25% and includes a repeat unit of general formula

##STR00001##

wherein t1 and w1 independently represent 0 or 1 and v1 represents 0, 1 or 2. The insulating layer has a thickness in the range 2 μm-300 μm.

Object: To provide a polyphase AC electric motor whereby partial discharge can be suppressed.

Resolution Means: The winding of each phase includes a first partial conductor that is an input side partial conductor; an nth partial conductor connected to a neutral point; and second to n-1th partial conductors. Moreover, a partial conductor disposed within the stator adjacent to the first partial conductor of each phase, or a partial conductor including a coil end portion disposed adjacent to a coil end portion where the first partial conductor extends out of the slot, is any of the following: (1) of the intermediate partial conductors, an ath (where a is a natural number greater than or equal to 2) partial conductor of the same phase or a different phase where voltage takes an extreme value when AC voltage is applied from the inverter; (2) any of an a-3th to a-1th partial conductors of the same phase or a different phase, or any of an a+1th to a+3th partial conductors of the same phase or a different phase connected to the intermediate partial conductor taking the extreme value; (3) any of a n-3th to nth partial conductors of the same phase or a different phase.

Object: To provide a polyphase AC electric motor whereby partial discharge can be suppressed.

Resolution Means: The winding of each phase includes a first partial conductor that is an input side partial conductor; an nth partial conductor connected to a neutral point; and second to n-1th partial conductors. Moreover, a partial conductor disposed within the stator adjacent to the first partial conductor of each phase, or a partial conductor including a coil end portion disposed adjacent to a coil end portion where the first partial conductor extends out of the slot, is any of the following: (1) of the intermediate partial conductors, an ath (where a is a natural number greater than or equal to 2) partial conductor of the same phase or a different phase where voltage takes an extreme value when AC voltage is applied from the inverter; (2) any of an a-3th to a-1th partial conductors of the same phase or a different phase, or any of an a+1th to a+3th partial conductors of the same phase or a different phase connected to the intermediate partial conductor taking the extreme value; (3) any of a n-3th to nth partial conductors of the same phase or a different phase.