What is the purpose of a diode in a motor circuit?
Diodes only allow electricity to flow in one direction (the direction of their arrow). When you turn the power off to a motor, you get a negative spike of voltage, that can damage your Arduino or the transistor. The diode protects against this, by shorting out any such reverse current from the motor.
What is a motor drive transistor?
Transistor Based DC Motor Driver Circuit Transistor based DC motor driver circuit is one of the simple DC motor driver circuit. It uses a power transistor (D880), DC motor and a resistor for its operation. Let IN be the input to the base of the transistor. To the collector of the transistor, the DC motor is connected.
How can a transistor control a motor?
Attach high-current load (i.e. the motor or light) to its power source, and then to the collector of the transistor. Then connect the emitter of the transistor to ground. Then to control the motor, you apply voltage to the transistor’s base.
Why do DC motors need transistors?
About Transistors Most motors require more current and/or voltage to operate. A transistor can act as a digital switch, enabling the Arduino to control loads with higher electrical requirements. The transistor in this example completes the motor’s circuit to ground.
Why motor is parallel to diode?
Therefore, in order to minimize voltage and prevent damage to the semiconductor a diode must be connected in parallel to the motor. A switch will make it possible to control the ON/OFF operation by connecting the motor to a DC power supply or disconnecting the power supply by opening the circuit.
How does a motor drive circuit work?
Motor drivers acts as an interface between the motors and the control circuits. Motor require high amount of current whereas the controller circuit works on low current signals. So the function of motor drivers is to take a low-current control signal and then turn it into a higher-current signal that can drive a motor.
How does a motor drive work?
By positioning a drive between the electrical supply and the motor, power is fed into the drive, and the drive then controls and regulates the power that is fed into the motor. This allows control of speed, direction, acceleration, deceleration, torque and, in some applications, position of the motor shaft.
How transistor controls motor speed?
If you need to control the speed of a DC motor the easiest way to do it is using a transistor. This is possible thanks to the PWM. The PWM (Pulse-Width Modulation ) is a signal with a variable duty cycle. If we use this signal and a transistor we can control the speed of a motor.
Do you need a transistor for DC motor?
To drive a DC motor you need a larger amount of current than Arduino board can give. For that reason you must use a transistor. Transistors have limits and maximum specs, just be sure those values are enough for your use.