Hitachi Automotive Systems
Flat cylindrical type intended to be built into the transmission or located between the engine and transmission. Used primarily in HEVs.
Wave winding with square-profile wire
HEV motors require high-torque and low-speed motor output characteristics. Accordingly, to deliver high torque, the two winding circuits are connected in series to increase the number of winding loops. Although this results in a shorter permissible operating time because of the large temperature rise while current is flowing, it is adequate for the short-duration torque-assist that occurs in HEVs when accelerating from a halt, for example.