In this project paper microcontroller based system to control speed of induction motor is developed using pulse width modulation technique [2].
The electric motor speed is fixed when AC motor is connected to AC line. Put a diode across the motor primary terminals rated for full motor current. Between delivered pulses, field collapse will drive the diode into conduction with full operating current. The hardware project is designed to control the speed of a BLDC motor using closed loop control technique.
BLDC motor has various application used in industries like in drilling, lathes, spinning, electric bikes etc. The speed control of the DC motors is very essential. This proposed system provides a very precise and effective speed control technique is used to control the speed of a given DC motor. The anticipated above speed control technique gives number of advantages such as low cost, simple in design, precise control efficient, light weight in practice and bi-directional speed control.
Circuit diagram of DC motor speed control using arduino is shown in the figure below. The working principle and program of this circuit is same as that of the LED brightness control.
This paper demonstrate the proposed model for motor driving circuit which is control the speed as well as direction control of the motor. This is the basis of working of a dc motor.
Controlling the speed of dc motor can be done by different ways like using a potentiometer and also by a controlled current to the armature. Apart from these techniques, pulse width modulation is the effective way to implement motor speed control. It is handy for many projects using a motor controlled by a micro-controller. The 3D view improves the inspection procedure of the board and component placement.
I just used a semi-homemade PCB board to be able to quickly assemble the board and test the circuit figure Figure-6 shows a bottom view of the assembled PCB board.
As you can see, some tracks have not covered completely with the solder-mask. The reason is that these tracks might carry a significant amount of current, so they need extra copper support.
A normal PCB track cannot tolerate a high amount of current and eventually, it will warm up and burn. To overcome this challenge with a cheap method , you must solder a thick bare copper wire figure-7 on the uncovered areas. This method enhances the current transmission capability of the track.
I have provided the PWM pulse with a function generator and examined the pulses on the motor wires. Question 10 months ago on Step 1. In contrast to bipolar transistors, MOSFETs do not require constant power input, as long as they are not being switched on or off. As a transistor requires a particular gate voltage in order to switch on, the gate capacitor must be charged to at least the required gate voltage for the transistor to be switched on. Similarly, to switch the transistor off, this charge must be dissipated, i.
When a transistor is switched on or off, it does not immediately switch from a non-conducting to a conducting state; and may transiently support both a high voltage and conduct a high current. Consequently, when gate current is applied to a transistor to cause it to switch, a certain amount of heat is generated which can, in some cases, be enough to destroy the transistor. Therefore, it is necessary to keep the switching time as short as possible, so as to minimize switching loss.
Typical switching times are in the range of microseconds. Leave your queries and feedback about this circuit in the below comments section. Just curious why the 10K resistors are required. I plan on driving a motor rated at 2Amps. What wattage rating would these resistors need to be?
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