1. Double dovetail slot ladder structure, good adhesion with packing, suitable for medium and high speed motors.

2. Structure with inner bushing: good hole wall strength, suitable for motors with large interference fit with shafts.

3. Structure with reinforcing ring: good overall performance, suitable for motors with high speed and poor working conditions.

When the coil passes through the current, it will rotate under the action of the magnet through the attraction and repulsion force. When it turns to balance with the magnet, the contact piece on the corresponding commutator of the originally energized line will be separated from the brush, and the brush will be connected to the contact piece corresponding to the group of coils that generate the driving force. This keeps repeating, and the DC motor will rotate.

If there is no function of commutator, the motor can only be stuck within half a turn, which can only be used as an electric brake. The centrifugal force generated when the motor rotates is used as the power to control the size of the starting resistance, so as to reduce the starting current of the motor, increase the starting torque, and make the wound asynchronous motor realize brushless automatic operation. It is mainly composed of casing, starting fluid, moving electrode plate, spring, terminal, safety valve, exhaust valve, etc.

Application of commutator:

1. Commutators mainly include hook type, slot type, flat type and other specifications. It is made of refined raw materials, and its functions reach a high level. The products are widely used in electric tools, household appliances, automobiles, motorcycle motors and other fields; Collecting ring, carbon brush holder and terminal block have various specifications and models.

2. It can be used in automotive generators, gasoline generators and other fields Commutator is used for rectification, and its function is to make the current direction in armature winding alternating, so as to ensure that the direction of electromagnetic torque is always unchanged.

3. In the generator, the commutator can change the alternating potential in the element into the direct current potential between the brushes; In the electric thought, it can change the external DC current into the AC current in the component, and generate the torque in a constant direction.

Commutator: an important part of the armature of DC motor and AC commutator motor. When the motor rotates, it plays a reversing role. It is a component on DC motor and AC series motor as current commutation, which is commonly called commutator in order to keep the motor rotating.

As an indispensable basic equipment in industry, transportation, national defense and daily life, the downstream industries of motors include almost all basic industries of the national economy. Commutator, as one of the core components of motor, is also growing with the development of motor industry.

Working principle of commutator:

The principle is that when the coil passes through the current, it will rotate under the action of the permanent magnet through the attraction and repulsion force. When it turns to balance with the magnet, the contact piece on the corresponding commutator of the originally energized line will be separated from the brush, and the brush will be connected to the contact piece corresponding to the group of coils that generate the driving force. This keeps repeating, and the DC motor will rotate.
If there is no function of commutator, the motor can only be stuck within half a turn, which can only be used as an electric brake. The centrifugal force generated when the motor rotates is used as the power to control the size of the starting resistance, so as to reduce the starting current of the motor, increase the starting torque, and make the wound asynchronous motor realize brushless automatic operation.

It is mainly composed of casing, starting fluid, moving electrode plate, spring, terminal, safety valve, exhaust valve, etc.
The hydraulic resistance starting device has the characteristics of small starting current, large starting torque, automatic adaptation to changes in power supply and load, motor protection, etc. The commutator is a high-speed rotating equipment, and its rotor winding will be subject to the action of electric force and centrifugal force. Although it has been operating under rated parameters, the welding interface between the rotor winding and the commutator riser is the weak link of the commutator rotor, and the traditional soldering process is used, Based on the measurement results of the DC resistance between the discs, it is judged that the welding point between the rotor winding and the commutator riser is loose, which leads to the fatigue of the end conductor, increases the contact resistance and heat generation, accelerates the oxidation of the contact surface, further increases the contact resistance and heat generation. This vicious cycle leads to the commutator rotor insulation burning at high temperatures, discharging the ground arc, and damaging the commutator.

The results of the disassembling inspection of the commutator show that the test data and judgment conclusions of the rotor winding are accurate. In addition to transmitting longitudinal current, motor commutator also has current commutation task in short-circuit armature coil. These currents are the reverse current and reactance voltage generated when the motor commutator is in the main current, which will cause edge sparks and arcs when the brush slides on the surface of the motor commutator The influence of the motor commutator on the motor function depends on the process of realizing the circuit continuity when it slides with the brush at a relatively high speed under certain conditions. Although the description of this process is complex and the theoretical research is still developing, through the comparative analysis of the operating conditions of micro motors at home and abroad, it can be determined that wear is the key factor leading to the change of contact resistance.