Magnetic gear tooth sensor targets EV traction motors

November 20, 2019 //By Christoph Hammerschmidt
Magnetic gear tooth sensor targets EV traction motors
The ATS17501 is a magnetic gear tooth sensor IC – according to its vendor Allegro Micro System the industry’s first one designed to provide incremental position for electric vehicle traction motors.

Handling rotational speeds up to 30.000 rotations per minute, the device addresses pressing traction motor challenges- including vibration at startup and running mode, high rotational speed, mechanical space constraints, high operating temperatures, and ISO 26262 safety requirements. Market-leading features include:

  • High speed switching up to 40kHz (30k RPM operation)
  • Advanced algorithms to suppress undesired output pulses at startup and running mode
  • Patented integrated magnet package reduces design complexity and enables smaller motors
  • Operating temperature up to 160°C
  • ASIL-B compliance (pending assessment)

Electric vehicles are becoming increasingly prevalent as original equipment manufacturers OEMs are required to comply with air quality, fuel efficiency, and vehicle safety standards. With the Electric and Hybrid Vehicle market forecasted to explode within the next few years, the use of traction motors to address these requirements presents new challenges to engineers designing electric motor control systems.

The ATS17501 provides high speed switching up to 40 kHz —the highest in the industry, according to Allegro. It directly measures rotating ferrous gears up to 30k RPM and provides an incremental encoded output with speed and direction information on a dual channel interface. 

The device also incorporates advanced digital signal processing for vibration robustness and is built on Allegro’s SolidSpeed Digital Architecture to provide electric motor commutation information.

The over molded 4-pin SIP SG package fully integrates a magnet to optimise performance over air gap and temperature. This integrated package provides the highest levels of reliability and predictability required for space-constrained traction motor applications.

Using a certified ISO 26262:2011 safety design process, the ATS17501 incorporates real-time diagnostics to achieve an ASIL-B(D) rating as a safety element out of context (pending assessment).

More information: click here

 


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