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All of that and more are discussed in this previous tutorial about DC motor control with L293D driver. Check it out and come back to resume developing our DC motor driver library for STM32 microcontrollers.
In this method, the field winding is excited by a constant voltage but the armature winding is supplied with different voltages through switching devices. The speed of the motor will be proportional to the armature voltage.
We can order the PCB from JLCPCB which are the PCB fabrication service of EasyEDA, and also they are the sponsor of this video.
In my case, I chose to collect the required data manually. This is straightforward if you have a regulated power supply (RPS) or similar power supplies and a multimeter. Here is the data I collected:
type DC Motors (permanent magnet types), our range does not apply to brushless which uses a completely different method to control motor speed than a brushed motor does!
Therefore, the MOSFET we select must support a gate input voltage of 5V to provide a maximum output within its limit.
We’ll have to do this step just to have the TIM_HAL files added to our project by CubeMX. And also it gives us a startup configuration for the PWM channel of that specific timer module as we’ll see hereafter. This is the best way to keep the code generic and portable to any STM32 microcontroller.
BDC motors may have a very simple design and are easy to control (some of them may not even need a controller). This is a cost-effective solution that can perfectly fit low voltage devices powered by lithium-ion batteries, including robotics and consumer electronics.
Most of us at the beginning think that only the duty cycle controls the DC motor speed. However, it’ll turn out to be not exactly true, also the FPWM has a strong effect if not picked correctly as we’ll see.
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When the entire field is connected, the motor runs at the lowest speed. The speed can be further increased in steps by cutting out the resistance in the series turns. This method of speed control is used in electric traction.
The PWM controller accepts the control signal and adjusts the duty cycle of the PWM signal according to the requirements. PWM waves with various duty cycle are shown in the figure below.
When writing firmware, remember to set up the correct PWM frequency to ensure the smooth operation of your motor controller.
The circuit is connected in breadboard as per the DC motor speed control circuit diagram shown above. The pot here is used to adjust the speed of motor.
SHOPEE COMPRAR AGORA