Motor Angle Sensor PCB With Handshake Authentication
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Solution Overview
Problem
Existing electric motors lack robust security measures and functional safety features, particularly in drive applications with inverters, and current encoders do not adequately protect against counterfeiting, sabotage, and unauthorized parameter changes, failing to meet stringent security standards like the European Cyber Resilience Act 2023.
Innovation Solution
A control device for electric motors incorporating a programmable logic device, such as a microcontroller, with integrated sensor elements and communication interfaces, provides enhanced security through emulation of EEPROM, authentication, and read protection, enabling secure data storage and communication, and implementing handshake procedures for verification.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If traditional encoders are used for angle detection, then the structure remains simple, but security against counterfeiting and sabotage is insufficient
Solution Approach 1:
The patent combines the encoder functionality with a programmable logic device (PLD) into a single integrated control device. The PLD is formed directly on the circuit board with the sensor element, merging angle detection with security functions including authentication, parameter storage, and protection against counterfeiting and sabotage.
Solution Approach 2:
The control device performs multiple functions: angle detection via the sensor element, parameter storage emulating EEPROM, authentication through handshake procedures, and security protection against counterfeiting and sabotage. This multi-functional approach eliminates the need for separate security components.
2Reliability
If external memory components are used for parameter storage, then storage capacity is sufficient, but protection against unauthorized changes is inadequate
Solution Approach 1:
The programmable logic device integrates parameter storage with the angle sensor on the same circuit board, eliminating the need for separate external memory components. The PLD emulates EEPROM functionality while providing built-in protection mechanisms.
Solution Approach 2:
The patent introduces a handshake procedure as an intermediary authentication mechanism between the control device and external systems. This handshake protocol verifies authenticity before allowing parameter access or modification, preventing unauthorized changes.
3Reliability
If separate security components are added to existing encoders, then security is improved, but the device becomes more complex
Solution Approach 1:
The patent merges security functions directly into the encoder control device by forming a programmable logic device on the same circuit board as the sensor element. This integration eliminates the need for separate security components while providing comprehensive protection.
Solution Approach 2:
The programmable logic device serves multiple purposes: authentication through handshake procedures, parameter storage emulating EEPROM, security protection against counterfeiting, and control of the electric motor. This multi-functionality consolidates what would otherwise require separate components.
Data Source
Figure 1~2
AI summary
The invention relates to a control device (14) for an electric motor (10), comprising at least one printed circuit board (16) and at least one sensor element (18) for determining the rotation angle of the electric motor (10), wherein the sensor element (18) is arranged on the printed circuit board (16), and wherein a programmable logic device (20) is additionally formed on the printed circuit board (16), which is configured for controlling and/or monitoring the electric motor (14) and the sensor element (18). The invention further relates to an electric motor (10).