Stand-Alone Motor Unit With Dynamic No-Load Speed Control
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Solution Overview
Problem
Existing motor units for power equipment lack efficiency and versatility, particularly in terms of power output, adaptability, and energy management, as they often require complex gearing and cannot efficiently manage no-load conditions or simulate bog-down scenarios like gasoline engines.
Innovation Solution
A stand-alone motor unit with a high power output electric motor, a battery pack, and a gear train system that includes a controller and sensors to manage torque transfer, adjust speed based on load conditions, and simulate bog-down scenarios, allowing for efficient operation and adaptability to various power equipment applications.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Power
If a high power output electric motor is used, then power delivery is improved, but energy waste during no-load conditions increases
Solution Approach 1:
The motor speed is made dynamically adjustable based on load conditions. The controller reduces motor speed during no-load conditions and maintains high speed under load, allowing the system to adapt its power consumption to actual operational needs rather than running at constant high speed
Solution Approach 2:
A sensor system provides feedback about the actual load on the motor to the controller. This feedback mechanism enables the controller to detect no-load conditions and automatically adjust motor speed accordingly, preventing energy waste while maintaining high power capability when needed
2Force
If complex gearing is used to manage torque, then torque control is improved, but device complexity increases
Solution Approach 1:
The patent replaces complex mechanical gearing systems with an electric motor system that provides torque control through electronic means. The electric motor inherently provides high torque at low speeds without requiring multiple gear stages, and the controller manages torque delivery electronically rather than mechanically
3Power
If the motor runs at high speed continuously, then power availability is improved, but energy consumption increases
Solution Approach 1:
The motor operates dynamically at varying speeds based on actual load requirements rather than maintaining continuous high speed. The controller adjusts motor speed in real-time, keeping it high when power is needed and reducing it during no-load or light-load conditions to optimize energy consumption
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
The motor unit provides efficient power output, adapts to different equipment needs, and conserves energy by reducing speed during no-load conditions and simulating bog-down scenarios, offering significant energy savings and operational flexibility.
Implementation Method 1
a battery pack including a pack housing, battery cells supported by the pack housing, and a first terminal electrically connected to the battery cells
Implementation Method 2
an electric motor located within the housing and having a power output of at least about 2760 W and a nominal diameter of up to about 80 mm. The motor includes a stator and a rotor supported for rotation relative to the stator
Data Source
AI summary
A stand-alone motor unit for use with a piece of power equipment includes a housing and a flange coupled to the housing on a first side thereof. A plurality of apertures through the flange defines a first bolt pattern that matches an identical, second bolt pattern defined in the piece of power equipment. An electric motor has a power output of at least about 2760 W. The motor includes a stator having a nominal outer diameter of up to about 80 mm and a rotor supported for rotation within the stator. A power take-off shaft receives torque from the rotor and protrudes from one of the flange or a second side of the housing. A controller is positioned within the housing and electrically connected to the motor. A battery pack for powering the motor has battery cells having a nominal voltage of up to about 80 V.