Starter Device Winding Segmentation Voltage Drop
Find Innovative SolutionsGenerate Solutions
Solution Overview
Problem
Existing starter devices for internal combustion engines experience a significant voltage drop during startup, which can lead to excessively low voltage levels at the battery terminals, potentially affecting the vehicle's on-board network.
Innovation Solution
The starter device incorporates a winding with low and high electrical resistance coils, controlled by a set of contactors to manage power supply in phases, ensuring the low resistance coils are initially powered in series with high resistance coils, then solo, to minimize voltage drop and maintain mechanical power delivery.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If the starter uses a conventional inductor winding with uniform resistance coils, then the mechanical power delivery is sufficient, but the voltage drop during startup becomes excessively low (below 9 volts)
Solution Approach 1:
The inductor winding is segmented into multiple coils with different resistance values (first coils with higher resistance, second coils with lower resistance). This segmentation allows the system to manage voltage drop during startup while maintaining mechanical power delivery by selectively activating different coil combinations through the contactor assembly.
Solution Approach 2:
The contactor assembly dynamically reconfigures the electrical circuit by transitioning between different contact positions (first, second, and third positions). This dynamic switching allows the system to adapt the inductor winding configuration based on operational requirements, managing voltage levels during startup while ensuring sufficient mechanical power delivery.
2Power
If the starter delivers maximum torque immediately, then mechanical power is sufficient, but the voltage drop causes excessively low terminal voltage affecting the on-board network
Solution Approach 1:
The contactor assembly performs preliminary action by first positioning the contact plate in the first position during startup, which configures the inductor winding to limit current peak and reduce voltage drop. This preliminary configuration protects the on-board network from excessive voltage drops before the system transitions to higher power delivery modes.
Solution Approach 2:
The system changes electrical parameters by transitioning between different coil configurations through the contactor assembly. By switching between first coils (higher resistance) and second coils (lower resistance) in series or parallel combinations, the system adjusts the inductor's electrical characteristics to manage voltage drop while maintaining torque output.
3Reliability
If the inductor winding uses high resistance coils only, then voltage drop is reduced, but the mechanical power and torque delivery become insufficient
Solution Approach 1:
The inductor winding is divided into segments with different resistance characteristics. The contactor assembly selectively connects first coils (higher resistance) and second coils (lower resistance) in various configurations, allowing the system to achieve both voltage stability during startup and sufficient torque delivery when needed.
Solution Approach 2:
The system merges different coil types with different resistance values into a unified inductor winding structure. Through the contactor assembly, both first coils and second coils work together in series or parallel configurations, combining their advantages to achieve both voltage stability and adequate mechanical power delivery.
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 significantly reduces voltage drop during initial current peaks, avoiding the need for expensive DC/DC converters or additional batteries, while maintaining sufficient impulse torque and ensuring battery voltage remains above 9 volts.
Implementation Method 1
an inductor coil (5) arranged to generate a magnetic field when a current flows through said inductor coil (5)
Implementation Method 2
an armature or rotor (2) capable of rotating about an axis X under the action of a magnetic field generated by said inductor coil (5)
Implementation Method 3
the inductor coil (5) comprises a plurality of coils including coils (50) having a low electrical resistance and first and second groups of coils (51, 52) having a high electrical resistance
Data Source
Figure 1
Figure 2~3
Figure 4~5
AI summary
The device has a starter drive assembly for starting a combustion engine through a toothed crown wheel. An electrical motor rotatably drives the drive assembly. The motor has a stator (3) comprising an inductor winding (5) formed by a set of coils, where one of the coils presents low electrical resistance and another coil presents high electrical resistance. A set of contactors (55) of the motor controls power supply of a portion of shunt coils (51, 52) before controlling the power supply of all coils of the inductor winding. An independent claim is also included for a method for starting a combustion engine of a motor vehicle.