6DD1602-0AE0  The working principle of brushed DC motor

The working principle of brushed DC motor – Optical Yu cable displacement sensor Cable displacement sensor cable encoder Cable encoder

6DD1602-0AE0  The working principle of a brushed DC motor is shown in the figure on the left, where N and S are a pair of fixed permanent magnets, the rotor of the motor is installed between the two magnetic poles, and the coil abcd is fixed above, and the coil segment has two commutators (also known as commutators) and two brushes.

When the current flows from the positive terminal of the power supply, from the brush A, commutator plate 1, coil, commutator plate 2, brush B, back to the negative terminal of the power supply, the current flow in the coil is a→b→c→d. According to the left hand rule, the coil produces a counterclockwise electromagnetic torque at this time. When the electromagnetic torque is greater than the load torque of the motor, the rotor will rotate counterclockwise.

6DD1602-0AE0  When the rotor is turned 180°, the coil ab side is turned from the magnet N pole to the near S pole, and the cd side is turned to the near N pole. Because the relative position of the brush in contact with the commutator plate changes, the current direction in the coil changes to d →c→b→a. According to the left hand rule, the coil still produces a counterclockwise electromagnetic torque at this time, and the rotor continues to rotate in a counterclockwise direction.

6DD1602-0AE0  In the process of rotation of the motor, due to the role of the brush and the commutator sheet, the DC current alternately flows in the coil in the direction of the opposite direction, and always produces the electromagnetic torque in the same direction, making the motor rotate continuously. Similarly, when the external power supply is reversed, the motor will rotate clockwise.