Sequentially joined-segment armature and ac machine using same

Abstract

A sequentially joined segment armature coil is provided which may be employed in an ac machine such as an ac motor or motor generator. The armature coil is equipped with three phase coils each of which is made up of a first and a second phase windings identical in number of turns. This structure permits the number of turns of the armature coil to be changed easily by changing a connection of the first and second phase winding between a series connection and a parallel connection or changing a connection of the phase coils between a star connection and a delta connection. The structure also enables terminal leads of the first and second phase windings of each of the phase coils to be collected and withdrawn outside the ac machine, thus facilitating ease of arrangement of the terminal leads.

Description

technical field [0001] The present invention generally relates to a sequential segment coupling armature and an alternating current electric machine employing such an armature usable as a rotating electrical machine for a motor vehicle. Background technique [0002] Due to the widespread use of idle stop systems in motor vehicles in recent years, which are designed to perform repeated start-stop motor operations, the use of AC motors is preferred over the use of brushed DC motors. However, the size of an AC motor that can provide the same high starting current as a typical DC series wound motor provides is larger than a typical AC motor, requiring a larger space in the motor compartment of the vehicle or the layout of the motor is inherently changes, which may result in an increase in vehicle weight. [0003] As an AC motor used in automobiles, a proposed AC motor is installed with a wire-segment coupling armature composed of U-shaped wire segments disposed in slots formed ...

AI Technical Summary

Problems solved by technology

Therefore, it is difficult to increase the number of turns of the stator coil without increasing the number of poles of the rotor, which also increases the difficulty of using a rotating electric machine with a high voltage battery in a motor vehicle

In addition, increasing the cross-sectional area of ​​the wire segment may increase its difficulty in bending, which will increase the difficulty of using stator coils with high current

[0007] The wires extending from the parallel phase windings of each phase coil are located far apart from each other, resulting in increased wire length and also increased wire resistance and inductance

The increased wire length requires more space in the rotating electrical machine, which also results in an increased length of the rotating electrical machine

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