Rotary position sensor uses pre-commutation technique for accuracy at high rotation speeds
June 06, 2012 // Paul Buckley
AMS has launched a magnetic rotary position sensor IC offering accurate angular measurement even at high rotation speeds.
The new device improves on previous generations of magnetic encoder by dynamically compensating for angle errors attributable to propagation delay, which are most noticeable at high speeds. Error compensation is achieved through integrated pre-commutation functions. These are easy to configure in the AS5132, and do not require external software routines to be executed, therefore unburdening host microcontrollers or electronic control units (ECUs). The configuration can be changed while the device is operating, in response to changes in operating conditions such as variations in rotation speed.
In addition, the advanced signal-processing circuitry in the AS5132 claims to give it an excellent propagation delay figure of <22 s, which means that even before pre-commutation is implemented the angle error is small.
In combination, the small propagation delay and advanced pre-commutation deliver extremely accurate angle measurement even in motors rotating at speeds up to 80,000rpm: angle measurements are accurate to within 3 (maximum). This enables BLDC motor manufacturers to achieve high and constant levels of torque even in high-speed applications over the whole dynamic range.
The AS5132 offers increased sensitivity to allow operation in a magnetic field input as weak as 20 mT. This enables the sensor to be paired with a cheap ferrite magnet.
The device simplifies the interface for easier integration and includes an external clock mode, synchronizing sensor and controller systems. The device has implemented a 3 V interface mode (in addition to a 5 V mode) eliminating the need for a level shifter. All news
Audi, BMW, Daimler drive open source measurement data management
July 28, 2014
To enable a correct interpretation and comparison of test data across the automotive industry, a number of carmakers and ...
A roadmap for cool and lossless lasers, with Bismuth
ST opens MEMS microphone test laboratory
Update yourself on anti-counterfeiting measures at Mouser
60 GHz startup targets mobile
Dual 13A or single 26A μModule regulator integrates digital power system management
July 25, 2014
Datacenters and server farms contain vast amounts of digital electronics, such as ASICs, FPGAs and CPUs. Powering, monitoring ...
What's that smell? An app for that soon, says Sensirion
GE phosphor powder creates more vibrant LED displays
Sensor manufacturer extends software capabilities
- THE RTOS AS THE ENGINE POWERING THE INTERNET OF THINGS
- Testing GPS with a Simulator
- DSM presents: Select the best plastic for DDR4
- Dual 13A μModule Regulator with Digital Interface for Remote Monitoring & Control of Power
InterviewCEO interview: China, not Apple, is way to go, says mCube CEO
Ben Lee, CEO of MEMS startup mCube, explains why he wants to spend $37 million on being a supplier of sensors to Chinese ODMs and avoiding a design win with Apple or Samsung.
Filter WizardCheck out the Filter Wizard Series of articles by Filter Guru Kendall Castor-Perry which provide invaluable practical Analog Design guidelines.
Linear video channel
READER OFFERRead more
This month, Altium Ltd is offering EETimes Europe's readers the chance to win one TASKING VX-Toolset for ARM Cortex-M Premium Edition, normally licensed for 2.395 Euros, for ultra-rapid prototyping and code development around ARM Cortex-M based microcontrollers.
The VX-toolset for ARM is the first TASKING compiler suite to receive the Software Platform technology, which is seamlessly...Read more
December 15, 2011 | Texas instruments | 222901974
Unique Ser/Des technology supports encrypted video and audio content with full duplex bi-directional control channel over a single wire interface.