DC Motor Thermal Control via Segmented Coil Center-Tap
Find Innovative SolutionsGenerate Solutions
Solution Overview
Problem
Conventional DC motors lack independent control over torque and heat generation, requiring external heaters for thermal stability which increases component count and cost.
Innovation Solution
A DC motor design with a magnet assembly and a coil assembly that uses three-phase currents to separately control driving force and heating energy through a center-tap connection, allowing independent regulation of currents to manage torque and temperature.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Device complexity
If a single phase coil is used in a conventional DC motor, then the magnetic circuit is simple and torque generation is efficient, but independent thermal control is not possible and external heaters are required
Solution Approach 1:
The single phase coil is divided into two separate coil sections (first coil section and second coil section) that are electrically connected in series. This segmentation allows independent current control through the center-tap connection, enabling separate thermal control of each coil section while maintaining the overall magnetic circuit simplicity.
Solution Approach 2:
A center-tap connection is introduced as an intermediary element between the two coil sections. This center-tap allows independent current injection into each coil section, serving as a mediator that enables thermal control without requiring external heaters or complicating the magnetic circuit structure.
2Temperature
If external heaters are added for thermal stability, then temperature control is achieved, but component count and system cost increase
Solution Approach 1:
The coil sections serve dual functions: generating magnetic field for torque production and generating heat for thermal control. By controlling the current through each coil section independently via the center-tap, the same components perform both motor function and thermal management function, eliminating the need for separate heaters.
Solution Approach 2:
The coil sections themselves are used to generate the heat required for thermal stability, rather than relying on external heating elements. The current flowing through the coil sections naturally produces Joule heating, which can be controlled independently to maintain desired temperature, making the system self-sufficient for thermal management.
3Force
If current is passed through the coil to generate torque, then driving force is produced, but heat generation cannot be independently controlled
Solution Approach 1:
The coil is segmented into two independently controllable sections with a center-tap connection. This allows the total current to be divided into different components: one component generates torque through the magnetic field interaction, while another component can be adjusted to control heat generation independently, resolving the coupling between force and temperature control.
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
Enables simultaneous or separate control of torque and heat generation without additional components, maintaining thermal stability and reducing system complexity and cost, while maintaining the force constant for improved efficiency and accuracy.
Implementation Method 1
A DC motor works by converting electrical energy into mechanical energy. This is accomplished by passing current through a coil located in a magnetic field which results in a force or torque
Implementation Method 2
heat generated in the DC motor
Data Source
AI summary
A direct current motor comprises a magnet assembly having a pair of magnets for generating a magnetic field and a coil assembly located between the pair of magnets, the coil assembly and the magnet assembly being movable relative to each other. The coil assembly further comprises a first coil section and a second coil section which are electrically connected to each other. A current generator is electrically connected to the coil assembly and is operative to provide first, second and third currents. The first current is electrically connected directly to the first coil section and the second current is electrically connected directly to the second coil section whereas the third current is electrically connected to the first and second coil sections at a position connecting the first and second coil sections.