STMicroelectronics launches sensorless zero-speed/high-torque motor control embedded software

 


【Lansheng Technology News】On December 21, 2023, STMicroelectronics released the STM32 ZeST* (zero speed full torque) software algorithm. The algorithm runs on an STM32 microcontroller, allowing the sensorless motor driver to produce maximum torque at zero rpm. STMicroelectronics is currently sharing this algorithm with select customers. This algorithm provides zero-speed, full-torque motor control for the first time in a general-purpose motor drive, enabling previously unachievable smoothness and predictability of motor operation.


The new STM32ZeST software algorithm is a universal solution for zero-speed sensorless motor control optimization, supporting any type of permanent magnet synchronous motor (PMSM). In order to achieve optimal control, the STM32ZeST algorithm needs to run synchronously with the newly launched High Sensitivity Observer (HSO) algorithm, using a sensorless non-inductive mode to control motor operation. As an embedded software solution, there is no need to install additional hardware or special peripherals on the STM32 microcontroller (MCU). To ensure that the motor control remains energy efficient, the resistance of the motor is also estimated at runtime.


By using the STM32ZeST and HSO software algorithms, designers can avoid high peak currents during the startup phase and improve the energy efficiency of their applications. Compared to motor drivers with Hall sensors, ST's solution reduces bill of materials (BOM), improves operational reliability, and reduces noise. STMicroelectronics has developed a demonstration model showing how an inductive motor driver can be activated to move a load at various speeds and at minimum speed. The model uses an electric pedal wheel to demonstrate that the motor always starts in the intended direction and can keep the load stationary at zero speed.


In order to facilitate developers to evaluate the performance of the STM32ZeST and HSO algorithms and speed up development progress, STMicroelectronics has developed supporting hardware tools. Among them, the B-G473E-ZEST1S control board generates PWM signals for the power supply board STEVAL-LVLP01. The power strip drives low power/low voltage motors, such as those found in STMicroelectronics' B-MOTOR-PMSMA kit. The connection between the control board and the power board uses the new embedded motor control connector V2.


STMicroelectronics provides developers with extensive additional support services to help them create drives for popular motor types that meet a variety of application requirements and meet energy efficiency, size, performance and cost constraints. The STM32 family of microcontrollers meets a variety of performance needs, and many products integrate features suitable for motor control, such as advanced motor control PWM timers. All of these products are supported by the STMicroelectronics Motor Control Software Development Kit (MC-SDK). The suite includes a motor control firmware library and a dedicated configuration tool (Motor Control Workbench). Both tools need to be used in conjunction with the STM32Cube ecosystem and the STM32CubeMX project configurator.


The HSO algorithm is integrated in the new version of MCSDK (version 6.2) development kit. The new version of MCSDK adds a dual-driver solution running on STM32 G4 MCU, and also supports various series of STM32 microcontrollers from the cost-effective STM32C0 to the high-performance STM32H5.


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