Full Name :JAGANATHAN
College Name :SIET
Study Material Description :Working of a H Bridge for Motor Control
Usually a DC Motor like most DC devices has polarity and the direction of rotation of the motor changes with the polarity. For example in the two circuits shown below the polarity of the power supply to the motor is opposite and hence the direction of rotation of the motor will also be opposite in both the cases. In the circuit 1 if the motor rotates in the clockwise direction then in circuit 2 the motor will rotate in anticlockwise direction.
Hence for making a DC motor run in opposite direction the polarity of the power applied to the motor must be changed or in other words the direction of the current through the motor must be changed.
In practical applications (for example robotic vehicles) the polarity cannot be interchanged manually and hence there is a need to form a circuit using which the direction of current through a motor can be changed. One such commonly used circuit configuration is a H Bridge.
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