Boost Manufacturing Productivity with Precise Position Encoder Solutions

Precise position and torque control enables higher quality and faster machining of complex components, thereby increasing throughput and manufacturing productivity, while also optimizing energy usage. Analog Devices holds the key enabling technologies to help customers accelerate time to market, while delivering high performance position encoder solutions. These technologies include precision converters for advanced control loop performance, high efficiency, highly integrated power management technology to overcome the thermal challenges of space-constrained housing and robust connectivity solutions, ideal for use in harsh industrial deployments.

Precise Position Encoder Diagram Optical and Magnetic Encoders Resolver Encoders

Optical and Magnetic Encoders

Multi-rail low noise LDOs such as the ADP320, LT3023, and LT3029 are used to power all components in optical and magnetic encoder signal chains. The ADM3066E RS-485 transceiver features ultra low transmitter and receiver skew performance, making these devices ideal for transmission of a precision clock. The high throughput rate and simultaneous sampling capabilities of the AD7380 4 MSPS SAR ADC enable on-chip oversampling, resulting in higher angular position accuracy. Depending on the needs of the application, alternative ADC options are shown in Table 1. For applications requiring resolutions of 12 bits or less, the MAX32672 ultra-low-power Arm Cortex-M4F microcontroller includes a 12-bit 1 MSPS ADC with enhanced security, peripherals, and power management interfaces.

The ADA4622-4 quad rail-to-rail op-amp with input EMI filters for increased signal robustness is ideally suited to optical encoders. It includes a strong output drive to improve settling time performance and enable direct drive of the AD7380 SAR ADC inputs.

For magnetic encoders, the ADA4571 - an anisotropic magnetoresistive (AMR) sensor – integrates signal conditioning amplifiers and ADC drivers improving reliability, in addition to reducing size and weight. Angular accuracy of 0.1o typical angular error enhances closed loop control, and reduces motor torque ripple and noise.

Featured Products

ADP320

Voltage Regulator

LT3023

Micropower Regulators

LT3029

Linear Regulator

ADM3066E

RS-485 Transceiver

AD7380

Analog-to-Digital (ADC)

MAX32672

32-Bit Microcontroller

ADA4622-4

Precision Operational Amplifiers

Resolver Encoders

For resolver encoders, the AD2S1210 is a complete monolithic resolver-to-digital converter with a wide temperature range (-40 oC to 125 oC). AD8694 amplifiers are used to create a third-order Butterworth low pass filter to pass the resolver signals to the AD2S1210. The LTC4332 SPI extender enables system partitioning, providing the option of placing the microcontroller at the servo drive, rather than at the encoder, saving space and reducing design complexity.

Featured Products

AD2S1210

Digital Converter with Oscillator

AD8694

CMOS Rail-to-Rail Output Quad Op Amp

LTC4332

Point-to-Point Rugged SPI Extender

Power Management

With the increasing deployment of more advanced manufacturing capabilities that utilize more motors with encoders, there is a need for a reduction in encoder form factor. Highly integrated power management solutions, supporting multiple voltage rails in compact footprint ICs, with high ambient temperature operation and high efficiency, help to reduce the thermal challenge within the encoder.

Featured Products

ADP120/220/320

Low Noise Voltage Regulators

LT3023/3027

Low Noise Voltage Regulators

LT3024/29

Low Noise Voltage Regulators

Robust Connectivity

For reliable data transmission at high data rates over long cables, jitter and skew performance are critical. The ADM3066E/ADM3067E half/full duplex RS-485 transceivers are suitable for use with common motor encoding protocols such as SSI, BiSS, EnDat 2.2 and Hiperface DSL. With ultra low transmitter and receiver skew performance, and high common mode transient immunity (CMTI), they are ideal for use in harsh industrial environments.

Featured Products

ADM3066E/3067E

RS-485 Transceiver

Next Generation Functionality

Position encoders are integrating new functionality to enable more advanced features and increase productivity. MEMS vibration sensors, such as the ADXL371, are being integrated into encoders to enable motor health monitoring by sensing vibration signatures that can then be used for condition-based monitoring or predictive maintenance features. Adjacent motor faults are often monitored using the industry leading low noise ADXL359 MEMS accelerometer. In some applications, such as CNC machines, the MEMS vibration data sent from the encoder to the servo drive can be used to optimize the performance of the system in real time.

Featured Products

ADXL371

MEMS Accelerometer

ADXL359

MEMS Accelerometer

Additional Resources

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Boost Manufacturing Productivity with Precision Position Encoder Solutions

Learn how ADI’s industry leading technology is enabling the development of high performance position encoder solutions, driving higher quality and faster machining of complex components to increase throughput and optimize energy usage.

Robust Industrial Motor Encoder Signal Chain Solutions

This webinar will highlight the key enabling technologies to help customers accelerate time to market, while delivering high performance position encoder solutions, including a deep-dive on the magnetic position sensing use-case.