Electric Mower Cutter Speed Control for Energy and Motor Protection
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Solution Overview
Problem
Conventional electric mowers operate with a fixed cutter speed or manual high/low settings, leading to excessive energy consumption, motor overheating, and reduced mowable area due to high cutter speed, especially under varying working conditions.
Innovation Solution
A mower system that adjusts cutter speed based on vehicle speed and incorporates a vehicle control unit, cutter unit, and battery management system to optimize energy consumption and protect components.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Productivity
If the rotating speed of the cutter is set to a high value to achieve effective mowing at maximum mower speed, then the mowing effect is improved, but the energy consumption of the cutter motor increases excessively
Solution Approach 1:
The patent applies dynamics by making the cutter rotating speed variable rather than fixed. The control unit dynamically adjusts the cutter speed based on real-time detection of mower traveling speed, ensuring the cutter operates at optimal speed for current working conditions rather than maintaining a constant high speed, thereby reducing unnecessary energy consumption while maintaining effective mowing.
Solution Approach 2:
The patent changes the parameter of cutter rotating speed from a fixed high value to a variable value that correlates with mower traveling speed. By establishing a proportional relationship between cutter speed and traveling speed, the system optimizes energy consumption while maintaining adequate mowing effectiveness across different operating conditions.
2Productivity
If the rotating speed of the cutter is maintained at a high constant value, then the mowing effectiveness is preserved, but the cutter motor overheats and may trigger heating alarm or damage
Solution Approach 1:
The system dynamically adjusts cutter speed based on actual mower traveling speed, preventing the cutter from operating at excessively high speeds that cause overheating. This dynamic control maintains cutter speed within safe operating limits while preserving mowing effectiveness, thereby protecting the cutter motor from thermal damage and triggering alarms.
Solution Approach 2:
The control unit receives feedback from the traveling speed detection unit and uses this information to adjust cutter motor speed accordingly. This feedback mechanism ensures the cutter operates at appropriate speeds that prevent overheating and protect motor reliability while maintaining adequate mowing performance.
3Power
If the capacity of the power battery is increased to support high power cutter motor, then the cutter can operate at high power, but the size and weight of the mower increase and mowable area is reduced
Solution Approach 1:
The patent applies dynamics by matching cutter motor power output to actual working conditions. Instead of using a large battery and high-power motor for all conditions, the system dynamically adjusts motor power based on traveling speed and mowing requirements, allowing a smaller battery to suffice while maintaining adequate power for various conditions.
Solution Approach 2:
The system changes the power consumption parameter of the cutter motor from a constant high power level to a variable level that correlates with traveling speed. This parameter adjustment allows the use of a smaller battery capacity while maintaining sufficient power for effective mowing across different operating conditions, thereby reducing overall weight.
4Productivity
If the rotating speed of the cutter is set high for maximum mower speed, then the mowing coverage is improved, but the blade wind resistance increases and energy consumption increases
Solution Approach 1:
The system dynamically adjusts cutter speed to match mower traveling speed, preventing excessive blade wind resistance. By coordinating cutter rotation speed with forward motion speed, the system maintains effective grass cutting while minimizing unnecessary wind resistance that would increase energy consumption and reduce overall efficiency.
Data Source
AI summary
A system comprises: a vehicle control unit for controlling the mower to operate; a walking unit for receiving a control signal of the vehicle control unit to control the walking of the mower and perform state feedback to the vehicle control unit; a cutter unit for receiving a control signal sent by the vehicle control unit to control the cutter to run and carrying out state feedback to the vehicle control unit; and a battery management system for performing state feedback on the working state of the battery to the vehicle control unit.