Motor Driver Power Extraction for Stable Encoder Supply
Find Innovative SolutionsGenerate Solutions
Solution Overview
Problem
Existing motor systems face challenges in providing stable power to external devices like encoders due to inefficiencies in wireless power transmission, especially in movable equipment where obstacles and orientation issues interfere with wireless power delivery, leading to increased workload and costs from cabling.
Innovation Solution
A motor design that includes a power extractor and supply unit to harness power from the motor's power line and supply it to external devices, using a transformer to efficiently extract and rectify AC power, eliminating the need for additional cabling and ensuring stable power delivery regardless of the motor's position or orientation.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of operation
If wireless power transmission is used to supply power to the encoder, then cabling workload is reduced, but power supply stability deteriorates due to obstacles and orientation issues
Solution Approach 1:
The patent introduces an intermediary power supply device that receives power from the motor's power line and transmits it to the encoder. This mediator converts the motor's driving power into encoder power through a transformer and rectifier circuit, ensuring stable power transmission without wireless interference issues.
Solution Approach 2:
The power line serving the motor is given dual functionality: it both drives the motor and supplies power to the encoder through the intermediary device. This multi-functional use of the existing power line eliminates the need for separate encoder cabling while maintaining reliable power delivery.
2Reliability
If separate cabling is installed for the encoder, then power supply stability is improved, but installation complexity and cost increase
Solution Approach 1:
The motor's power line is designed to serve dual purposes: powering the motor and powering the encoder through the intermediary device. This eliminates the need for separate encoder cabling, reducing installation complexity while maintaining power supply reliability through the stable wired connection.
Solution Approach 2:
The patent merges the motor power supply function and encoder power supply function into a single integrated system. The intermediary device combines the transformer and rectifier circuits to convert motor power into encoder power, consolidating multiple functions into one compact unit mounted on the motor.
3Ease of manufacture
If wireless power transmission is used, then installation cost is reduced, but power reception efficiency deteriorates in movable equipment
Solution Approach 1:
The intermediary power supply device acts as a mediator that captures power directly from the motor's power line through a transformer. This wired intermediary approach eliminates wireless transmission losses while still avoiding separate encoder cabling, maintaining installation simplicity.
Solution Approach 2:
The system uses the motor's own driving power to supply the encoder through the intermediary device. The power is extracted from the motor's power line and converted, allowing the motor system to self-service the encoder without external power sources or wireless transmission infrastructure.
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 provides stable power to external devices like encoders without the need for additional cabling, reducing workload and costs, and ensures reliable operation even in challenging environments by efficiently extracting and supplying power from the motor's power line.
Implementation Method 1
The transformer may include a primary coil to receive a part of power in the winding unit. The extractor may extract a part of the power in the winding unit using the transformer.
Implementation Method 2
The supply unit rectifies the extracted AC and supplies the AC to the external device.
Data Source
AI summary
A driver supplies driving power to a motor including an extractor that extracts a part of externally supplied power and a supply unit that supplies the power extracted by the extractor to an external device. The driver includes an output unit that outputs, to the motor, driving power for the motor on which first power to be supplied to the external device is superimposed. The output unit adjusts the first power to be superimposed by controlling a d-axis current value in a driving current for the motor. This structure allows stable power supply to the external device associated with the motor.