Wheeled Power Tool Motor Layout for Higher Torque Density
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Solution Overview
Problem
Large wheeled power tools require high motor torque, but existing electric motors have low torque densities and low utilization rates of magnetic steels, limiting efficiency improvement.
Innovation Solution
The electric motor design includes a stator with 12 tooth portions and a rotor with 10 or 14 magnetic pole pairs, where the included angle between magnetic steels is 30° to 45°, enhancing magnetic steel utilization and torque density.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of manufacture
If 16 magnetic steels are arranged to form 8 magnetic pole pairs, then the motor structure is simple and easy to manufacture, but the torque density is low and magnetic steel utilization rate is low
Solution Approach 1:
The patent changes the number of magnetic pole pairs from 8 to 10 or 14, and adjusts the included angle of magnetic steels to 30°-45°, optimizing the magnetic field distribution to increase torque density while maintaining manufacturing feasibility
Solution Approach 2:
The patent uses an asymmetric arrangement of magnetic steels with specific included angles (30°-45°) rather than symmetric distribution, creating optimal magnetic field patterns that enhance torque output and magnetic steel utilization
2Power
If the number of magnetic pole pairs is increased to improve torque density, then the motor efficiency improves, but the motor structure becomes more complex
Solution Approach 1:
The patent optimizes specific parameters including the number of magnetic pole pairs (10 or 14) and the included angle of magnetic steels (30°-45°), achieving high torque density without excessive structural complexity through precise parameter selection
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 design improves the utilization rate of magnetic steels and increases torque density, resulting in higher efficiency and better heat dissipation, meeting the power requirements of wheeled power tools.
Implementation Method 1
an electric motor configured to drive the walking wheels to rotate, where the electric motor includes a stator and a rotor rotating relative to the stator, the stator includes a stator core and multiple windings disposed on the stator core, the rotor includes a rotor core and multiple magnetic steels disposed on the rotor core
Data Source
AI summary
A wheeled power tool includes: a body; a walking mechanism, where the walking mechanism includes walking wheels supporting the body; and an electric motor configured to drive the walking wheels to rotate, where the electric motor includes a stator and a rotor rotating relative to the stator, the stator includes a stator core and multiple windings disposed on the stator core, the stator core includes tooth portions for winding the multiple windings, and the rotor includes a rotor core and multiple magnetic steels disposed on the rotor core. The number of the tooth portions is 12. The number of magnetic pole pairs formed by the multiple magnetic steels is 10 or 14. The included angle α between two corresponding magnetic steels forming each of the magnetic pole pairs is greater than or equal to 30° and less than or equal to 45°.