Compact Electric Work Machine Motor With Rotor-End Sensor Layout
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Solution Overview
Problem
Large electric work machines with large motors are difficult for operators to handle due to their size and weight, necessitating a reduction in motor size while maintaining functionality.
Innovation Solution
The design incorporates a smaller motor with a stator and rotor configuration, including a sensor board with a rotation sensor and plate arrangement that supports the sensor, where the distance between the support area and the rotor end face is shorter than the distance between the sensor and the stator, allowing for a more compact motor assembly.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Power
If a large motor is used in the electric work machine, then the motor can provide sufficient power and performance, but the machine becomes difficult for operators to handle due to increased size and weight
Solution Approach 1:
The patent positions the rotation sensor on the stator rather than the rotor, changing the spatial dimension of sensor placement. This allows the sensor to detect rotor position through the air gap without adding axial length to the motor assembly, enabling compact design while maintaining adequate motor power
2Ease of operation
If the motor size is reduced to improve handling, then the machine becomes easier to operate, but the motor may lose sufficient power and performance
Solution Approach 1:
By placing the rotation sensor on the stator in a position that faces the rotor across the air gap, the patent eliminates the need for additional axial space that would be required if the sensor were mounted on the rotor. This enables a compact motor design with reduced overall dimensions for easier handling, while the sensor still effectively detects rotor position for precise control, maintaining motor power
3Measurement precision
If the distance between the rotation sensor and rotor end face is increased to improve detection accuracy, then measurement precision improves, but the motor assembly size increases
Solution Approach 1:
The patent positions the rotation sensor on the stator to face the rotor through the existing air gap, utilizing the radial space rather than requiring additional axial length. This maintains adequate detection precision by preserving the necessary sensor-to-rotor distance while keeping the motor assembly compact in the axial direction
Solution Approach 2:
The patent creates a localized support area on the stator that is radially inward from the coil, providing an optimal position for the rotation sensor. This local positioning optimizes the sensor-to-rotor distance for detection precision without affecting the overall motor assembly dimensions
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 results in a downsized motor assembly that is easier to handle and reduces the size and weight of the electric work machine, enhancing operational convenience without compromising performance.
Implementation Method 1
a rotation sensor configured to detect rotation of the rotor
Data Source
AI summary
An electric work machine includes a smaller motor. An electric work machine includes a motor including a stator and a rotor rotatable about a rotation axis, and a sensor board including a rotation sensor that detects rotation of the rotor and a plate supporting the rotation sensor. The plate includes a first surface facing an end face of the rotor in an axial direction parallel to the rotation axis and a support area receiving the rotation sensor that faces the end face, and a second surface facing at least a part of the stator. In the axial direction, a distance between the support area and the end face is shorter than a distance between at least a part of the second surface and the end face.