Brushless Motor Coil PCB Layout for Delta Parallel Winding
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Solution Overview
Problem
The complexity of motor coil connections in work machines complicates the assembly process and reduces design flexibility, despite advancements in motor performance through wiring method innovations.
Innovation Solution
A brushless work machine with a stator and rotor featuring a winding configuration that includes short-circuit portions on a circuit board to connect coils easily, allowing for delta-connected and parallel-connected coils, simplifying the connection process and reducing component count.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Power
If multiple phases are delta-connected and multiple coils of each phase are connected in parallel (delta connection parallel winding), then motor performance is improved, but the connection structure of motor coils becomes complicated
Solution Approach 1:
The patent introduces a circuit board as an intermediary component to manage coil connections. The circuit board provides standardized connection terminals and wiring paths, mediating between the multiple coils and the external power/control system. This intermediary structure simplifies the overall connection complexity while maintaining the delta-connection parallel winding configuration for high motor performance.
Solution Approach 2:
The circuit board serves multiple functions: it provides electrical connections for delta-connection parallel winding, offers mounting positions for coils, and establishes standardized connection interfaces. This multi-functional design consolidates several roles into a single component, reducing the overall complexity of the motor coil connection structure while maintaining high power output capability.
2Power
If the connection structure of motor coils is complicated, then motor performance can be improved, but assembling efficiency is reduced
Solution Approach 1:
The patent divides the motor assembly into distinct segments: the circuit board as a separate connection module, the coils as independent winding units, and the stator core. This segmentation allows coils to be pre-assembled and tested independently before final integration, significantly improving assembling efficiency while maintaining the complex delta-connection parallel winding structure for high motor performance.
Solution Approach 2:
The circuit board is designed with pre-established connection terminals and wiring paths before coil installation. Connection points and routing are prepared in advance, allowing coils to be directly connected without complex on-site wiring. This preliminary preparation of connection structures accelerates the assembly process while maintaining the high-performance delta-connection parallel winding configuration.
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
This configuration enhances assembly efficiency, facilitates coil connections, and improves design freedom while maintaining high output performance without complicating the coil connection structure.
Implementation Method 1
a brushless motor having a stator having a plurality of teeth, a rotor rotating with respect to the stator
Data Source
AI summary
Provided is a work machine. The work machine has a brushless motor, and the brushless motor has a plurality of teeth. A stator coil is wound around each of the teeth. An end portion of each stator coil is connected to a circuit board. The circuit board has: a first conductor pattern connecting the stator coils wound around adjacent teeth; and a second conductor pattern and a third conductor pattern each connecting the stator coils wound around the non-adjacent teeth. The plurality of stator coils are in the form of delta connection parallel winding.