Speed-Controlled 24V Brushless DC Outrunner Motor Reference Design


Design files


This advanced motor implements closed-loop speed control to maintain an exact RPM across the load torque profile.  The magnetic rotor position is sensed by the DRV5013 Hall-effect sensors, and the DRV8308 controller decides when to drive the CSD88537ND FETs that energize the coils.  No microcontroller or firmware is used, and the intelligent sinusoidal current drive minimizes acoustic noise and torque ripple to maximize motor performance.

As seen at APEC

  • Speed controlled at 2054 RPM for any torque load up to 118 mNm (16.7 oz-in)
  • Power input supports 24V to 32V and more than 5A
  • Outrunner style provides good power density in 6x6x3 cm3 form
  • Easy to modify RPM and max current with resistor changes
  • Design features up to 71% efficiency
  • System has been fully tested and proven
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A fully assembled board has been developed for testing and performance validation only, and is not available for sale.

Design files & products

Design files

Download ready-to-use system files to speed your design process.

TIDU311.PDF (1911 K)

Test results for the reference design, including efficiency graphs, test prerequisites and more

TIDR561.PDF (85 K)

Detailed schematic diagram for design layout and components

TIDR562.PDF (47 K)

Complete listing of design components, reference designators, and manufacturers/part numbers


Includes TI products in the design and potential alternatives.

BLDC drivers

DRV830842-V max sensored sinusoidal control, 3-phase BLDC gate driver with SPI

Data sheet: PDF | HTML
Hall-effect latches & switches

DRV5013High voltage (up to 38-V), high bandwidth (30-kHz) Hall effect latch

Data sheet: PDF | HTML

CSD88537ND60-V, N channel NexFET™ power MOSFET, dual SO-8, 15 mOhm

Data sheet: PDF | HTML

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Technical documentation

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Type Title Date
Test report TIDA-00197 Test Results Apr. 29, 2014

Related design resources

Hardware development

DRV8308EVM DRV8308 evaluation module for three-phase brushless DC motor pre-drivers

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