DC generator interpretation
A DC generator is a machine that converts mechanical energy into DC electrical energy. It is mainly used as a DC motor for DC motor, electrolysis, electroplating, electrosmelting, charging, and excitation of an alternator. Although the AC power is used to convert the AC power to DC power where DC power is required, the AC motor as a whole cannot be compared with the DC generator in terms of ease of use, reliability of operation, and certain operational performance.
A DC generator is a machine that converts mechanical energy into DC electrical energy. It is mainly used as a DC motor for DC motor, electrolysis, electroplating, electrosmelting, charging, and excitation of an alternator. Although the AC power is used to convert the AC power to DC power where DC power is required, the AC motor as a whole cannot be compared with the DC generator in terms of ease of use, reliability of operation, and certain operational performance. The DC generator is assembled by assembling the stator and rotor of the generator through the bearing, the base and the end cover, so that the rotor can rotate in the stator, and a certain excitation current is passed through the slip ring to make the rotor become a rotating magnetic field, and the stator coil is made. The movement of the magnetic lines of force is cut, thereby generating an induced potential, which is drawn through the terminal and connected to the circuit to generate an electric current.
The armature is dragged by the motor to make it rotate at a constant speed counterclockwise, and the coil sides a b and c d respectively cut the magnetic lines under the magnetic poles of different polarities to induce an electromotive force.
The working principle of the DC generator is to change the alternating electromotive force generated in the armature coil by the commutation function of the commutator and the brush, so that it changes to the DC electromotive force when it is taken out from the brush end because the brush A passes through the commutation. The electromotive force drawn by the sheet is always the electromotive force in the side of the coil that cuts the N-pole magnetic field lines. Therefore, the brush A always has a positive polarity, and the same reason, the brush B always has a negative polarity. Therefore, the brush end can lead to a pulsating electromotive force whose direction is constant but whose size changes.
Conclusion: The induced electromotive force in the coil is an alternating electromotive force, and the electromotive force at the A B end of the brush is the DC electromotive force. When the armature of the generator is driven by other machines to rotate counterclockwise at a uniform speed, the coil abcd is used to cut the magnetic line motion. When the coil is turned to the position shown in Figure 1.1.B, the right-hand rule can be used to determine that the direction of the induced electromotive force generated by the ab segment conductor is b→a; the direction of the induced electromotive force generated by the cd segment conductor is d→c, then with the slider 1 The brush A that is in contact is a positive electrode, and the brush B that is in contact with the slider 2 is a negative electrode. When the coil is turned to the neutral plane (the plane perpendicular to the magnetic line of inductance), the induced electromotive force gradually decreases from the maximum value to zero. When the coil turns through the neutral plane, the direction of the induced electromotive force generated by the ab segment conductor is from a→b; the direction of the induced electromotive force of the cd segment conductor is from c→d. At this time, the brush A is changed to be in contact with the slider 2 of the commutator, and the brush B is in contact with the slider 1. As the coil rotates continuously in the magnetic field, the induced electromotive force between the commutator vanes 1 and 2 is an alternating electromotive force whose magnitude and direction change with time, but the brushes A and B alternately contact the coil for simultaneous rotation. The sliders 1 and 2 are such that a pulsating DC electromotive force is generated between the brushes A and B, and a direct current is output from the A and B.
