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BLDC Scalar Drives

In scalar drives normally only the frequency and the magnitude of the voltage fed to the motor are controlled (current feedback not mandatory)
For permanent magnet 3Ī¦ motors (BLDC, PMSM) rotor speed and/or position is required so as to keep stator and rotor flux positions synhcronous. In the case where the rotor speed/position is drawn without the usage of phisycal sensors (Hall, encoders,...) the drive is referenced as 'sensor-less'.
Thanks to the fact that with this type of drive, it's easy to achieve a sensor-less control of the electrical motor, six-step (also known as block commutation) is one of the most common scalar drives available for both PMSM and BLDC. Additionally in six-step drive, when in current mode, the motor current amplitude can be controlled making possible the motor torque regulation.
As scalar drives do not require intensive mathematical computations, they can be implemented on cost effective microcontrollers (starting from 8-bit).

Design Support

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Technical Documentation

Application Notes

Description Version Size
pdf
AN1088: L6234 three phase motor driver
2.4 350 KB
pdf
AN1625: L6235 three phase brushless DC motor driver
2.3 1,030 KB
pdf
AN1905: ST7MC three-phase BLDC motor control software library
2.2 1,743 KB
pdf
AN1944: Developing IGBT applications using an TD350 advanced IGBT driver
4.3 682 KB
pdf
AN1946: Sensorless BLDC motor control and BEMF sampling methods with ST7MC
2.2 653 KB
pdf
AN2002: Using the demoboard for the TD350 advanced IGBT driver
1.3 913 KB
pdf
AN2030: Back EMF detection during PWM on time by ST7MC
2.2 340 KB
pdf
AN2123: TD351 Advanced IGBT Driver Principles of operation and application
1.4 979 KB
pdf
AN2267: Implementation of current regulator for BLDC motor control with ST7FMC
1.3 345 KB
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AN2372: Low cost sinusoidal control of BLDC motors with Hall sensors using ST7FMC
1.3 166 KB
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AN2502: Enhanced sensorless startup control of BLDC motors using ST7FMC
1.1 89 KB
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AN4243: The L6230 DMOS driver for three-phase brushless DC motor
1.1 933 KB
pdf
AN4339: BLDC motor based ceiling fan solution proposal
1.0 926 KB

Publications and Collaterals

Magazine

Description Version Size
htm
High Efficiency Motor Control Solution for HVACs
0 KB
htm
Torque Production Using 6 Step VS. Sinusoidal Commutation for BLDC Motors
0 KB
pdf
Why choose a Fast Diode MOSFET in a three-phase inverter topology providing six-step current commutation
349 KB

Conference Paper

Description Version Size
pdf
An Improved Microcontroller-Based Sensorless Brushless DC (BLDC) Motor Drive for Automotive Applications
1.0.0 713 KB
pdf
An Improved Microcontroller-based Sensorless Brushless DC (BLDC) Motor Drive for Automotive ApplicationsĀ 
301 KB
pdf
Further Improvement of Direct Back EMF Detection for Sensorless Brushless DC (BLDC) Motor Drives
1.0.0 361 KB
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