Multiphase Brushless Motor Starter for MT Straddled Vehicle
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Solution Overview
Problem
In MT-type straddled vehicles, the arrangement of components in the region higher than the crankcase is limited, restricting flexibility and potentially leading to a decline in starter motor functions.
Innovation Solution
Employing a multiphase brushless motor that serves as both a starter motor and a generator, allowing the starter motor to be removed from the region above the crankcase, thereby creating more space for other components and improving heat dissipation for the motor driver.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If the starter motor is arranged in the region higher than the crankcase, then the starter motor can be positioned close to the crankshaft for efficient starting, but the space for other components is limited and arrangement flexibility is reduced
Solution Approach 1:
The starter motor is extracted from the region higher than the crankcase and repositioned to the end portion of the crankshaft. This extraction resolves the spatial conflict by removing the starter motor from the constrained upper region, thereby improving arrangement flexibility for other components while maintaining starting function through the alternative positioning at the crankshaft end
Solution Approach 2:
The starter motor is repositioned from a vertical arrangement (higher than crankcase) to a horizontal arrangement (end portion of crankshaft). This dimensional change allows the starter motor to maintain functional proximity to the crankshaft while freeing up the vertical space for other components, thus resolving the spatial contradiction
2Temperature
If the motor driver is arranged in a space between the side cover, air cleaner, and battery, then heat dissipation is improved through air flow, but the arrangement space is constrained
Solution Approach 1:
The motor driver is positioned in the interstitial space between the side cover, air cleaner, and battery, utilizing the air flow path as a thermal mediator. The air flow that passes through this region serves as a cooling medium for the motor driver, enabling effective heat dissipation in a constrained space without requiring dedicated cooling structures
Solution Approach 2:
The motor driver is arranged in the vertical dimension between the side cover and air cleaner, rather than occupying horizontal space. This vertical positioning utilizes the existing air flow path in the vertical direction, enabling heat dissipation through convection while minimizing the horizontal footprint and preserving arrangement flexibility
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 configuration enhances flexibility in the arrangement of components above the crankcase while maintaining the functionality of the starter motor, thereby improving the overall design and performance of the MT-type straddled vehicle.
Implementation Method 1
a multiphase brushless motor that also serves as a power generator is provided as the starter motor at the end part of the crankshaft
Implementation Method 2
a multiphase brushless motor that also serves as a power generator is provided as the starter motor at the end part of the crankshaft
Implementation Method 3
an air cleaner configured to clean the air to be supplied to the engine
Implementation Method 4
The motor driver is arranged in a space between the side cover, and the air cleaner and the battery so that at least a part of the motor driver overlaps both the air cleaner and the battery in view of the left-right direction. This arrangement allows the motor driver and the battery to keep radiating the heat through the air
Data Source
Figure 1(a)~1(b)
Figure 2
Figure 3
AI summary
The MT type straddled vehicle according to the present teaching includes an engine, a multi-phase brushless motor that is provided at one end portion of a crankshaft of the engine and starts the engine and is driven by the engine to generate electricity, and a motor driver that performs switching of an electric current that is to be supplied to the multi-phase brushless motor. The air cleaner and the battery are arranged next to each other in the front-back direction so that both of the air cleaner and the battery lie over two regions that are defined by division of a space including the MT type straddled vehicle by a center plane passing through the center of the MT type straddled vehicle in the left-right direction and extending both in the up-down direction and the front-back direction of the MT type straddled vehicle. The motor driver is arranged in a space between the side cover, and the air cleaner and the battery so that at least a part of the motor driver overlaps both the air cleaner and the battery in view of the left-right direction. The air cleaner cleans the air to be supplied to the engine. The side cover covers at least a part of each of the air cleaner and the battery in view of the left-right direction.