Universal Brushless DC Motor Controller Architecture
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Solution Overview
Problem
Conventional brushless DC motors are costly to develop and adapt for different applications due to their operation as open loop systems, requiring separate development for each specific control system, which increases the R&D period and product costs.
Innovation Solution
A universal brushless DC motor design incorporating a brushless DC motor unit and a controller unit with integrated power, position sensing, current sensing, and I/O interface circuits, allowing operation in multiple control modes through a microprocessor that can be programmed for torque, speed, and air volume regulation, enabling closed-loop control and reducing the need for multiple motor types.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Adaptability or versatility
If conventional brushless DC motors operate as open loop systems with special integrated circuits, then the motor can be developed for specific applications, but the development cost and R&D period increase significantly when adapting to different applications
Solution Approach 1:
The patent implements a universal brushless DC motor with a standardized controller unit that can be applied across multiple applications (electric fans, air conditioners, washing machines, etc.). The controller includes standardized components: integrated power module, microprocessor unit, rotor position sensing circuit, current-sensing circuit, and I/O interface circuit. This universal design allows the same motor platform to serve different applications without requiring separate development, thereby improving adaptability while reducing development complexity and costs.
2Reliability
If separate development is done for each application-specific motor, then the control system can be optimized for that application, but the product cost and R&D time increase
Solution Approach 1:
The patent establishes a preliminary universal platform with standardized controller architecture and integrated circuits before specific application deployments. The controller unit pre-integrates essential functions (power management, position sensing, current sensing, I/O interfaces) that can be directly applied to various applications. This preliminary universal design reduces R&D time for new applications while maintaining reliable control performance through the standardized architecture.
3Ease of manufacture
If a universal controller unit with integrated circuits is implemented, then development costs are reduced, but the device complexity increases
Solution Approach 1:
The patent merges multiple control functions into a single integrated controller unit. The controller integrates the power module, microprocessor unit, rotor position sensing circuit, current-sensing circuit, and I/O interface circuit into one unified device. This consolidation reduces manufacturing costs by eliminating the need for separate control components and simplifies the overall system architecture, making the motor easier to manufacture across different applications despite the sophisticated functionality.
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 universal brushless DC motor reduces development costs and workload by allowing a single motor type to be adapted for various applications, providing efficient closed-loop control and satisfying diverse control needs, thus lowering production costs and simplifying the R&D process.
Implementation Method 1
a permanent magnet rotor assembly magnetically coupled with the stator assembly
Data Source
AI summary
The invention teaches a brushless DC motor, comprising a brushless DC motor unit and a controller unit, wherein the brushless DC motor unit comprises a stator assembly, a permanent magnet rotor assembly magnetically coupled with the stator assembly, an enclosure supporting the installation of stator assembly and the permanent magnet rotator assembly, an end shield installed at the end of the enclosure, the rotating shaft of the permanent magnet rotor assembly projecting out of the end shield; the controller unit comprises an integrated power module, a microprocessor unit, a rotor position sensing circuit, a power source circuit, an I/O interface circuit, a current-sensing circuit, and a controller box; and the controller unit is electrically connected to the brushless DC motor unit. The brushless DC motor of the invention has an ideal control circuit with a plurality of control units serving to control the motor operation characteristics stored in the microprocessor unit so that the brushless DC motor is broadly universal and can be operated under a plurality of control modes.