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 cadence 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 power is required to assist the cyclist. Cadence sensors measure how quickly the cyclist is pedaling. MagAlpha sensors can be used to detect cadence and inform the motor how much power is needed to assist the cyclist in various scenarios. For example, no power is required to go downhill meanwhile the cyclist requires assistance from the motor to go uphill.

MPS’s 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 sleep, and the system only becomes 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.

Additional features include:

  • 8-bit to 13-bit, ±3σ resolution
  • Absolute angle output (0 degrees to 360 degrees)
  • Ultra-low power consumption (<0.5µA idle mode)
  • Ability to wake up microcontroller on angle change
  • Smallest package footprint in industry with UTQFN (2mmx2mmx0.6mm) package