Shared Encoder and Sensor Bus for Motor Control Wiring Reduction

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Solution Overview

Problem

The existing motor control systems incur increased physical and processing costs due to multiple sensors and devices being connected directly to the motor control apparatus, leading to higher wire and traffic costs, especially in real-time sensing scenarios.

Innovation Solution

A motor control system where sensors and a position detector share a common communication path with an input/output device, allowing information from both to be transmitted to the motor control apparatus through a single communication network, reducing the need for individual connections.

Engineering Contradictions & Design Principles

VSEngineering Contradiction Analysis

1Reliability

If each sensor is connected directly to the motor control apparatus through separate communication paths, then reliable data transmission is achieved, but physical cost and processing cost increase

Engineering Contradiction:
Improvedata transmission reliabilityVSAvoidphysical cost and processing cost
Core Design Contradiction:
ReliabilityVSDevice complexity

Solution Approach 1:

The patent combines multiple communication paths into a single shared communication bus, allowing multiple sensors to transmit data simultaneously through one communication channel. This merging approach reduces the number of physical connections and processing overhead while maintaining data transmission reliability through protocol-based data routing and identification.

Inventive Principle:
Principle #5Merging (Combining)

Solution Approach 2:

The communication bus is designed as a universal interface that can handle multiple types of data transmissions (position information, sensor data, control signals) through a single channel. This multi-functional communication path eliminates the need for dedicated communication lines for each sensor, reducing physical cost while maintaining system reliability.

Inventive Principle:
Principle #6Universality (Multi-functionality)

2Adaptability or versatility

If multiple sensors are connected to the motor control apparatus, then comprehensive monitoring is achieved, but wire cost and traffic cost increase

Engineering Contradiction:
Improvemonitoring capabilityVSAvoidwire cost and traffic cost
Core Design Contradiction:
Adaptability or versatilityVSQuantity of substance

Solution Approach 1:

Multiple sensor connections are merged into a single communication bus, eliminating the need for separate wire connections for each sensor. The communication bus carries multiplexed data from all sensors, significantly reducing wire cost while maintaining comprehensive monitoring capability through data identification and routing protocols.

Inventive Principle:
Principle #5Merging (Combining)

Solution Approach 2:

The communication bus acts as an intermediary that mediates between multiple sensors and the motor control apparatus. Instead of direct point-to-point connections, all communications pass through the shared bus, reducing the quantity of physical connections required while enabling comprehensive data collection from multiple sensors.

Inventive Principle:
Principle #24Intermediary (Mediator)

Data Source

PatentEP3605836B1Motor control system and input/output device
Publication Date: 2025.10.08 YASKAWA DENKI KK
  • EP3605836B1 patent drawingFigure 1~2
  • EP3605836B1 patent drawingFigure 3A~3C

AI summary

A motor control system (1) includes: a mechanical apparatus configured to be driven by a motor (10); an encoder (30) configured to detect position information of the motor (10); a motor control apparatus (20) configured to control the motor (10); one or a plurality of sensors (501-506) configured to detect information relating to at least any one of the mechanical apparatus and the motor (10); and an input and output device (40) including a plurality of input-and-output connectors (#1-#8), wherein the encoder (30) and the input and output device (40) are configured to be connected to the motor control apparatus (20) through a same communication path, the sensor (501-506) is configured to be connected to the input-and-output connector (#1-#8) of the input and output device (40), the position information is configured to be transmitted from the encoder (30) to the motor control apparatus (20), and the information relating to at least any one of the mechanical apparatus and the motor (10) is configured to be transmitted from the sensor (501-506) to the motor control apparatus (20) through the input and output device (40) .