Power tool eval board from ST and Wurth

Würth Elektronik and STMicroelectronics are demonstrating a brushless dc motor power tool power circuit developed between them.

ST Wurth stdes-ptool3demo power tool design

The demo is based on the STDES-PTOOL3A evaluation board.

“The Gerber files, bill of materials, schematics and all other reference materials are downloadable from ST.com without charge,” according to Wurth.

From ST comes the STM32G4 (Cortex-M4) MCU, STDRIVE101 gate driver and six STL220N6F7 mosfets amongst others, then Wirth contributed its LHMI power inductor and CBF ferrite EMI suppression bead.

The MCU software was developed using ST’s X-CUBE-MCSDK motor control development kit.

Specs include operation up to 20A from 12 to 24Vdc (36V possible with resistor changes for 8S batteries)
Output RMS current up to 20 AMP

Sensor-ed or sensor-less operation is possible, with a default sensor-less three-shunt vector (field-oriented control) algorithm Torque or speed modes are available and drive dynamics can be tuned alongside other parameters such as switching frequency.

Protections include over-current, under-voltage lockout and thermal shutdown.

Find the demo at Smart Product Solutions (SPS) in Nuremberg, SIDO in Lyon or Paris, and the ST STDES-PTOOL3A product page