Stator Jumper Wire Orientation for Uniform Rotor Rotation
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Solution Overview
Problem
Conventional stators experience uneven rotor rotation due to differing current directions through coils and jumper wires, leading to inductance changes and vibration issues.
Innovation Solution
A stator design with in-phase coils connected in parallel, featuring an annular core back, radially extending teeth, and a specific winding pattern for conducting wires, including jumper wires that extend in the same circumferential direction to minimize inductance changes and prevent rotational unevenness.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Adaptability or versatility
If jumper wires are disposed on different paths for different coils, then connection flexibility is improved, but inductance changes occur due to magnetic fields from jumper wires, causing uneven rotor rotation
Solution Approach 1:
The patent applies homogeneity by making all jumper wires extend in the identical circumferential direction (e.g., all clockwise or all counterclockwise) around the core back. This uniform arrangement ensures that magnetic fields generated by jumper wires affect all coils consistently, preventing inductance variations and ensuring uniform rotor rotation while maintaining connection flexibility.
2Ease of manufacture
If current directions through coils and jumper wires differ, then coil winding flexibility is improved, but inductance changes occur causing vibration and uneven rotation
Solution Approach 1:
The patent ensures that current flows through all jumper wires in the same circumferential direction, creating uniform magnetic field effects across all coils. This homogeneous current direction arrangement eliminates harmful inductance variations that would otherwise cause vibration and uneven rotor rotation, while still allowing flexible coil winding configurations.
Applied Scientific Principles
This section explains which scientific principles are used to turn an abstract innovation direction into a practical engineering solution.
Function Achieved in This Case
The solution effectively prevents uneven rotor rotation and reduces vibration by maintaining consistent inductance across coils, improving motor efficiency and output.
Implementation Method 1
when the drive current is passed through the conducting wire, a direction of the current passed through the coil and a direction of the current passed through the jumper wire returning from the coil are different from each other. For this reason, inductance of the coil is changed by a magnetic field generated from the jumper wire returning from the coil
Data Source
AI summary
A stator of a polyphase motor in which in-phase coils are connected in parallel includes an annular core back, teeth extending radially from the core back and arranged circumferentially, a slot between two adjacent teeth, conducting wires respectively wound around the teeth to define the coils, and first and second connectors to which ends of each of the in-phase coils are connected, respectively. The conducting wire includes one or two jumper wires between each coil and the first connector or the second connector, and at least one jumper wire extends in an identical circumferential direction from the first connector toward the second connector with respect to all the in-phase coils.