PCB Stator Motor Driver Integration for Low-Cost Two-Phase Control
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Solution Overview
Problem
Existing motor driver circuitry for two-phase motors is complex and costly, relying on traditional wire-based windings and high-cost magnetic materials, which complicates manufacturing and increases expenses.
Innovation Solution
The development of a simplified two-phase motor driver circuit integrated onto the same printed circuit board (PCB) as the stator windings, utilizing a split-neutral design with rectifiers, capacitors, and switching devices to control current in the phase windings, thereby reducing manufacturing costs and complexity.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If traditional wire-based windings and complex driver circuitry are used, then motor performance can be achieved, but manufacturing cost and complexity increase significantly
Solution Approach 1:
The patent merges the driver circuitry with the PCB stator by integrating all control electronics, rectifiers, capacitors, and switching devices directly onto the same PCB substrate as the stator windings. This consolidation eliminates separate circuit boards, control electronics, and associated mounting hardware, thereby reducing manufacturing complexity while maintaining motor performance through integrated circuit design.
Solution Approach 2:
The PCB serves multiple functions simultaneously: it acts as the structural support for the stator, carries the phase windings through printed circuit traces, and houses the complete driver circuitry including rectifiers, capacitors, and switching devices. This multi-functionality reduces the number of separate components and assembly steps, addressing the manufacturing complexity issue while preserving motor performance.
2Ease of operation
If traditional driver circuitry with H-bridges and PWM circuitry is used, then precise motor control is achieved, but additional control electronics and power supplies are required
Solution Approach 1:
The patent combines H-bridge circuits, PWM control circuitry, rectifiers, and power supply components into a single integrated PCB assembly with the stator. The driver circuitry is implemented using printed circuit traces and surface-mounted components, eliminating the need for separate control electronics and power supply units, thereby reducing overall device complexity while maintaining precise motor control capability.
Solution Approach 2:
The integrated PCB design allows the driver circuitry to draw power directly from the same substrate that carries the stator windings, eliminating the need for isolated power supplies and complex grounding arrangements. The circuit utilizes the PCB's inherent electrical pathways to provide self-contained power distribution and control, reducing external component requirements.
3Ease of manufacture
If PCB-based stators are used, then manufacturing cost and volume production are reduced, but driver circuitry integration is needed
Solution Approach 1:
The patent integrates the driver circuitry directly onto the PCB stator using standard PCB fabrication techniques and surface-mount component assembly. This approach leverages the existing PCB manufacturing infrastructure to produce the complete motor assembly in a single production line, maintaining the cost and volume production advantages of PCB-based motors while incorporating the necessary driver circuitry through integrated circuit design.
Solution Approach 2:
The patent replaces traditional mechanical wiring and discrete component assembly with printed circuit trace connections and automated surface-mount technology. This substitution enables the driver circuitry to be manufactured using the same automated PCB fabrication processes as the stator windings, maintaining manufacturing simplicity and cost-effectiveness while achieving full circuit integration.
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 solution enables the production of low-cost, high-volume two-phase motors by integrating driver circuitry with the PCB stator, reducing the need for complex control electronics and high-cost materials, while maintaining efficient motor operation.
Implementation Method 1
a first load rectifier having an anode and a cathode, wherein the anode is connected to the load terminal; a second load rectifier having an anode and a cathode, wherein the cathode is connected to the load terminal
Implementation Method 2
a first load rectifier capacitor having a first end connected to the cathode of the first load rectifier and a second end connected to the ground; a second load rectifier capacitor having a first end connected to the anode of the second load rectifier and a second end connected to the ground
Implementation Method 3
a first switching device having an input terminal, an output terminal, and a switching control terminal, wherein the input terminal is connected to the cathode of the first load rectifier; a second switching device having an input terminal, an output terminal, and a switching control terminal, wherein the input terminal is connected to the anode of the second load rectifier
Implementation Method 4
A two-phase motor includes a PCB stator and a rotor. The PCB stator can include a first phase winding and a second phase winding
Implementation Method 5
The PCB stator can include a first phase winding and a second phase winding, each having a first end and a second end
Data Source
AI summary
Driver circuits for a low-cost two-phase motor are disclosed. Cost reductions may be further achieved by utilizing a printed circuit board (PCB)-based stator and methods of manufacturing, as disclosed herein. The disclosed technology can be particularly well matched for use in two-phase motors, such as axial-flux motors the utilize one or more ferrite-based rotors and a printed circuit board (PCB)-based stator. In certain implementations, part or all of the motor driver circuitry may be integrated onto the same PCB as is utilized to define the stator windings. In other implementations, the motor driver circuitry may be independently utilized with other traditional electrical motors.