Angle Sensor Use Case: E-Bikes

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In this use case, we will examine the application of MagAlpha Angle Sensors in e-bikes..

MagAlpha sensors can be used to detect both cadence and torque, and inform the motor on how much power is needed to assist the cyclist in various scenarios.

E-bikes rely on sensors to inform the motor when more power is required to assist the cyclist. While cadence sensors measure how quickly the cyclist is pedaling, torque sensors measure how hard the cyclist is pedaling. MagAlpha sensors can be used to detect both cadence and torque, and inform the motor on how much power is needed to assist the cyclist in various scenarios. For example, the amount of power required to go downhill will differ from the amount of power required to go uphill.

MPS’ MA735 and MA782 angle sensors also allow accurate wake-on-angle detection features <0.5µA in idle mode for throttle and gear shifters. When an angle, or motion, is detected, the sensor sends an interrupt to the system. This allows the rest of the system to be able to sleep and will only be activated once the sensor is triggered. Using Hall sensor technology, these ultra-low-power angle sensors provide excellent feedback and are suitable for small motors and field-oriented control (FOC). These sensors address torque management by providing less torque ripple with low noise. In addition, the MA782 and MA735 are available in compact (2mmx2mmx0.6mm) UTQFN packages.

These discrete components result in a complicated design process, lack of charging programmability, decreased charging accuracy, and large board size. Additional features include:

  • 8-14 bit ±3σ resolution
  • Absolute angle output 0-360 degrees
  • Ultra-low power consumption (<0.5µA Idle Mode)
  • Ability to wake up microcontroller on angle change
  • Smallest package footprint in industry (2mmx2mmx0.6mm) UTQFN