Polyphase alternating-current motor and electric power steering apparatus
First Claim
1. A polyphase alternating-current motor, comprising:
- a stator;
a plurality of coils that are arranged in a circumferential direction of the stator; and
a plurality of bus bars the number of which corresponds to the number of phases, and that receive a polyphase alternating-current,wherein the bus bars are arranged at one end portion of the stator, and end portions of the coils are connected to the corresponding bus bars,wherein each of the bus bars hasan intermediate electrical path portion that extends along the circumferential direction of the stator,a plurality of end electrical path portions that branch from the intermediate electrical path portion at multiple positions in the circumferential direction of the stator, and that are connected at end portions to the end portions of the coils, anda main electrical path portion that is formed at one position of the intermediate electrical path portion, and that is connected to a motor drive circuit, andwherein a shape of a portion of the intermediate electrical path portion at which the multiple end electrical path portions are formed between the main electrical path portion and an end portion of the intermediate electrical path portion is changed from a portion at which the main electrical path portion is formed toward the end portion of the intermediate electrical path portion in such a manner that the shape is changed after each intervening end electrical path portion.
1 Assignment
0 Petitions
Accused Products
Abstract
In a motor that includes bus bars each of which has an intermediate electrical path portion, end electrical path portions, and a main electrical path portion, the width of a portion of the intermediate electrical path portion at which the multiple end electrical path portions are formed between the main electrical path portion and an end portion of the intermediate electrical path portion is decreased from the portion at which the main electrical path portion is formed toward the end portion of the intermediate electrical path portion in such a manner that the width is decreased immediately after each intervening end electrical path portion by a unit width “w” that is equal to the width of the end electrical path portion. Thus, it is possible to prevent the current density in the intermediate electrical path portion from being excessive so that the current density is maintained substantially constant, and to attain lighter bus bars, and, consequently, to attain a lighter motor.
13 Citations
13 Claims
-
1. A polyphase alternating-current motor, comprising:
-
a stator; a plurality of coils that are arranged in a circumferential direction of the stator; and a plurality of bus bars the number of which corresponds to the number of phases, and that receive a polyphase alternating-current, wherein the bus bars are arranged at one end portion of the stator, and end portions of the coils are connected to the corresponding bus bars, wherein each of the bus bars has an intermediate electrical path portion that extends along the circumferential direction of the stator, a plurality of end electrical path portions that branch from the intermediate electrical path portion at multiple positions in the circumferential direction of the stator, and that are connected at end portions to the end portions of the coils, and a main electrical path portion that is formed at one position of the intermediate electrical path portion, and that is connected to a motor drive circuit, and wherein a shape of a portion of the intermediate electrical path portion at which the multiple end electrical path portions are formed between the main electrical path portion and an end portion of the intermediate electrical path portion is changed from a portion at which the main electrical path portion is formed toward the end portion of the intermediate electrical path portion in such a manner that the shape is changed after each intervening end electrical path portion. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13)
-
Specification