3 Phase 24V-48V 15A 500W RS485 Dual Channel Brushless DC Hub Motor Controller Driver For Mobile Robot

An H-bridge is a circuit usually made using two pairs of transistors working as switches. They allow the motor to either go backwards or forwards, depending on how the switches are controlled. Most of the controllers are based on such a circuit.

An H-bridge controls the direction in which your motor spins i.e. either forward or backward. This is controlled by switching the polarity of the input voltage of the motor. If a positive voltage is applied via the H-bridge, the motor spins in a certain direction and when the polarity is reversed, I.e. a negative voltage is applied, the motor starts spinning in the opposite direction. The direction of spin of the motor plays an essential part in robotics projects as it allows the robots to move in different directions and perform various tasks.

An H-bridge is made up of two pairs of transistors which are connected to the motor and supplied with an input voltage. Each of the pairs of transistors are connected on the opposite ends of the motor and one is supplied with the input voltage while the other transistor is grounded. As one pair of transistors is switched on at a time, the current flows from the source voltage to the positive terminal of the motor, then to the negative terminal of the motor, and then finally to the ground. This is the case of a positive polarity.

Similarly, when the other two transistors are switched on, the current flows from the voltage source to the negative terminal of the motor, then to the positive terminal of the motor, and finally to the ground. This is the case of a negative polarity since the current enters the motor through its negative terminal.

Servo Motor System Components

• Brush or Brushless Servo Motor
• Encoder / Feedback Device
• Servo Motor Amplifier / Drive
• Servo Motor Controller