Motor Assembly Detection Circuit Wiring Configuration
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Solution Overview
Problem
Conventional motor assemblies have complex circuit configurations that increase the likelihood of miswiring, particularly with detection circuits connected directly to electric wires, leading to potential operational issues.
Innovation Solution
A motor assembly with a detection circuit positioned between the detection wire and the ground wire, utilizing an optocoupler detection circuit to transmit signals to the control circuit, which controls motor speed based on load electrification, thereby simplifying wiring and preventing incorrect connections.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If the detection circuit is connected directly to the first electric wire and second electric wire, then the motor can detect load electrification status, but the circuit configuration becomes complex and miswiring risk increases
Solution Approach 1:
The patent introduces a detection wire as an intermediary element that indirectly detects load electrification status. Instead of connecting the detection circuit directly to the first and second electric wires, the detection wire is connected to these wires through switching elements (transistors or triacs). This intermediary approach simplifies the circuit configuration by providing a dedicated detection path while maintaining reliability through isolated detection connections.
2Measurement precision
If the detection circuit uses multiple connection points to the electric wires, then the detection accuracy improves, but the wiring complexity and miswiring possibility increase
Solution Approach 1:
The patent segments the detection function by separating the detection wire connections from the main power wires. The detection wire connects to the first electric wire through one switching element and to the second electric wire through another switching element. This segmentation allows accurate load detection through multiple connection points while simplifying wiring by providing a dedicated, isolated detection path that is less prone to miswiring.
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 solution provides a cost-effective and straightforward wiring configuration that reduces the risk of miswiring while enabling motor operation at varying speeds, enhancing operational reliability and ease of manufacturing.
Implementation Method 1
The detection circuit can be an optocoupler detection circuit. The optocoupler detection circuit comprises a first resistor, a second resistor and an optocoupler; the detection wire is connected to the first pin of the optocoupler via the first resistor
Implementation Method 2
The power supply circuit comprises an electromagnetic compatibility (EMC) circuit and a rectifier, and the commercial AC electric supply flows through the EMC circuit and the rectifier and outputs a bus DC voltage
Data Source
AI summary
A motor assembly including a motor and a control circuit board. The motor includes a housing, a stator assembly, a rotating shaft, and a rotor assembly. The control circuit board includes a first electric wire, a second electric wire, a detection wire, a ground wire, a power supply circuit, a control circuit, and a detection circuit. The first electric wire and the second electric wire are connected to the commercial AC electric supply, and the detection wire detects whether or not a load connected to the motor is electrified. The first electric wire and the second electric wire are connected to the input terminals of the power supply circuit. The detection circuit is disposed between the detection wire and the ground wire. The detection circuit transmits a detection signal to the control circuit, and the control circuit controls the motor to rotate at various rotation speeds.