Brushless DC Dynamo Electronic Commutation Control
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Solution Overview
Problem
Conventional brushless DC dynamos have complex VVVF control methods, making them difficult to control and operate efficiently, and lack a working mode similar to conventional DC dynamos.
Innovation Solution
A brushless DC dynamo design featuring a circular armature unit with specific armature conductors and magnetic poles, controlled by a logic unit that outputs signals to control switches to manage armature coil connections and switch operations, allowing for efficient operation and power modulation similar to conventional DC dynamos.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Adaptability or versatility
If VVVF control method is used in brushless DC dynamo, then the dynamo can operate with variable frequency and voltage, but the control complexity increases significantly
Solution Approach 1:
The armature conductors are divided into multiple slots arranged in a circular pattern, with each slot containing specific conductors that can be independently controlled. The control switches are segmented into multiple groups, where each group controls a specific set of armature slots. This segmentation allows for simplified control of variable frequency and voltage operations by managing smaller, discrete control units rather than a single complex control system.
2Force
If conventional DC dynamo structure is used with brushes and commutators, then the magnetic field can be kept perpendicular for maximum torque, but mechanical contact issues arise
Solution Approach 1:
The mechanical brush and commutator system is replaced with an electronic switching system. Control switches are used to electrically connect different armature slots to the external circuit, eliminating the need for physical sliding contacts. This substitution maintains the ability to control current direction for maximum torque while eliminating wear and reliability issues associated with mechanical contact.
3Reliability
If brushless DC dynamo with permanent magnet rotor is used, then mechanical contact is eliminated, but the control method becomes too complex and unnatural
Solution Approach 1:
The circular armature structure with multiple slots can operate in multiple modes: as a motor with permanent magnet rotor, as a generator, or in hybrid modes. The same control switch array can be configured to achieve different operating conditions. This multi-functionality simplifies control by using a universal structure and control mechanism that adapts to different operations rather than requiring separate complex control systems for each mode.
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 design simplifies control and operation, reduces mechanical contact issues, and provides efficient power modulation, enhancing the dynamo's performance and reliability.
Implementation Method 1
the circular armature unit and the magnetic unit rotate relatively to each other under control
Implementation Method 2
L slots of first armature conductors spaced with each other in sequence... L slots of second armature conductors spaced with each other in sequence
Data Source
AI summary
This invention provides a brushless dc dynamo, which is characterized by using semiconductor switches to replace commutators used in conventional brush DC dynamo, wherein the periodically mechanical contact of the armature and different electrodes are replaced with static electronic switching array to periodically switch electrically without any mechanical contact switching between the armature and electrodes. Meanwhile, the armature can work as conventional mode to always maintain the distribution of the armature current such that the magnetic field of the rotator is perpendicular to the magnetic field of the stator during rotating, and the damage of switched contacts caused by mechanical contact of the armature and electrodes can be avoided.