Manned Mower Battery Layout for Continuous Heavy-Load Operation
Find Innovative SolutionsGenerate Solutions
Solution Overview
Problem
Existing electric mowers face challenges in accurately detecting the rotor position of the mowing electric motor under heavy-load conditions, leading to potential motor shutdown and user experience issues.
Innovation Solution
A manned mower design that includes a traveling wheel set, a vehicle frame, a support portion for the operator, and a power supply assembly with detachable battery packs. The power supply assembly is strategically positioned and designed to provide sufficient energy to the traveling electric motor, ensuring continuous operation under heavy loads.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Device complexity
If the detection method without position sensor is used to reduce device complexity, then the structure is simpler, but the rotor position cannot be accurately acquired under heavy-load operation causing motor shutdown
Solution Approach 1:
The patent changes the detection parameters by injecting high-frequency signals to measure back electromotive force, and adjusts control parameters such as rotational speed thresholds and ripple/hysteresis limits to maintain reliable rotor position detection under heavy-load conditions without requiring additional position sensors
Solution Approach 2:
The patent discards the need for physical position sensors by recovering rotor position information through electrical measurements of back electromotive force and current ripple analysis, achieving sensorless control that maintains reliability under heavy load
2Use of energy by moving object
If the power supply assembly is designed with sufficient energy capacity to ensure continuous operation under heavy loads, then the energy storage increases, but the device dimensions and weight increase
Solution Approach 1:
The patent employs detachable battery packs that allow dynamic configuration of energy capacity based on operational requirements, enabling users to adjust power supply weight and energy capacity according to specific task demands rather than requiring fixed high-capacity power supply for all scenarios
Data Source
Figure 1
Figure 2~3
Figure 4
AI summary
A manned mower includes a traveling wheel set; a vehicle frame; a support portion used for supporting an operator; a traveling electric motor used for driving the traveling wheel set; and a power supply assembly used for supplying power to at least the traveling electric motor and including at least one detachable battery pack. The vehicle frame includes a left bracket portion and a right bracket portion for supporting the power supply assembly, the power supply assembly is disposed between the left bracket portion and the right bracket portion, and a maximum inner width W1 of the left bracket portion and the right bracket portion in a left and right direction is less than or equal to 700 mm, and total energy of a single row of the power supply assembly along the left and right direction is greater than or equal to 8 kW·h.