How can DC motor speed be controlled using microcontroller?

How can DC motor speed be controlled using microcontroller?

Dc motor or fan speed is controlled using Pwm(Pulse width Modulation) technique. Their are two ways to generate pulse width modulation signal using 8051(89c51,89c52) microcontrollers. PWM in simple words changes the output voltage on a specified pin on which it is applied by varying the duty cycle of output wave form.

How control the speed of DC motor interfaced with 8051 explain in detail?

DC Motor Interface with 8051 Microcontroller

1. As shown in the above figure we have connected two toggle switches on P1. 0 and P1.
2. One toggle switch at pin P1. 2 controls the motor rotating direction.
3. P1.
4. And Speed of the DC Motor is varied through PWM Out pin P2.
5. Here we are using the timer of AT89S52 to generate PWM.

What are the speed control techniques of DC motor?

Speed control methods of DC motor

• Flux control method. It is already explained above that the speed of a dc motor is inversely proportional to the flux per pole.
• Armature control method.
• Voltage Control Method.
• Flux control method.
• Variable resistance in series with armature.
• Series-parallel control.

How can we change speed of DC motor using PWM?

In this paper, to control the speed of DC motor using Pulse Width Modulation (PWM) method. Microcontroller AT89S52 is used to generate PWM. L293D IC is used to drive the motor which is made up of two H-Bridge. 555 IC is used with opto coupler to sense the speed of DC motor.

How can we change the speed of a DC motor using PWM in pic16f886 microcontroller *?

A variable resistor is used to change the duty cycle of PWM. By moving the knob of a variable resistor you can change the duty cycle which is directly related to the speed of the DC motor. Therefore, we can adjust the speed of the DC motor by adjusting the variable resistor knob according to your speed requirement.

How can we change the speed of a DC motor using PWM in pic16f 886 microcontroller?

Two push button switches are connected to 1st and 2nd pins of PORTD which is used to control the duty ratio of the generated PWM. Pressing the UP switch increases the duty cycle, which increases the motor speed while pressing the DOWN switch decreases the duty cycle, which decreases the motor speed.

Which can provide a speed control technique in the DC motor interfacing?

14. Which of the following can provide a speed control technique in the DC motor interfacing? Explanation: The pulse width modulation can provide a speed control technique in the DC motor interfacing by changing its mark/space ratio.

Why DC motor Cannot be directly interfaced with 8051?

Most of the DC motors have power requirements well out of the reach of a microcontroller and more over the voltage spikes produced while reversing the direction of rotation could easily damage the microcontroller. So it is not wise to connect a DC motor directly to the microcontroller.

What is speed control of motor?

An electric motor is a device that converts electrical energy into mechanical energy. In a DC shunt motor (the field is in parallel with the armature), the speed is controlled by increasing or decreasing the applied voltage to the shunt field or armature by means of a field rheostat or an armature rheostat.

What is meant by speed control?

: equipment designed to operate automatically under certain conditions to keep the speed of a railroad train within a predetermined rate.

How is an SCR used to control the speed of a DC motor?

Rectifier (SCR) control is the most basic speed control available. Very simply, it places a single SCR in series with the DC motor’s armature winding as shown in Figure 1A (see page 2). This converts the AC into DC by simply blocking the negative half cycle of the AC sine wave.

Why PWM is used in DC motor?

Motors as a class require very high currents to operate. Being able to vary their speed with PWM increases the efficiency of the total system by quite a bit. PWM is more effective at controlling motor speeds at low RPM than linear methods.

How does a microcontroller control a DC motor?

Dc motor or fan speed is controlled using Pwm (Pulse width Modulation) technique. Their are two ways to generate pulse width modulation signal using 8051 (89c51,89c52) microcontrollers.

How to generate pulse width modulation with 8051 microcontroller?

Their are two ways to generate pulse width modulation signal using 8051 (89c51,89c52) microcontrollers. You can generate it by using timers of 8051 (89c51,89c52) microcontroller OR you can switch a particular pin (high and low) so rapidly with some arbitrary delay in switching, that a pulse is generated as output on the pin.

What are the advantages of using a DC motor?

The main advantage in using a DC motor is that the Speed-Torque relationship can be varied to almost any useful form. To achieve the speed control an electronic technique called Pulse Width Modulation is used which generates High and Low pulses. These pulses vary the speed in the motor.

How is power on reset on a microcontroller achieved?

Power-on reset for the microcontroller is achieved through capacitor C6 and resistor R2. Switch S1 provides manual reset to the microcontroller. A 12MHz crystal (XTAL) is used for basic clock frequency. CONCLUSION: Port pin P1.1 is internally pulled cup.