Is the DC reduction motor brushless or brushless? Disassembly of the DC reduction motor

What kind of motor is the DC reduction motor

DC geared motors belong to the category of DC motors. A DC motor is an electric motor that converts DC electrical energy into mechanical energy. Its rotor has a permanent magnet or armature, which generates torque and speed through the interaction between the armature and the magnetic field, thereby achieving mechanical movement.

The DC reduction motor is based on the DC motor, and a reduction device is added to make it have the functions of deceleration and transmission. It is suitable for applications that require large torque and low speed, such as cooling towers, fans, conveyor belts, etc. DC reduction motors are widely used in industrial automation, robots, electric vehicles and other fields, and are one of the indispensable key equipment in modern industry and production.

Is the DC gear motor brushless or brushless?

DC geared motors can be brushed or brushless. The difference between them is the connection between the permanent magnets on the motor rotor and the armature.

Brushed DC reduction motor: The rotor of a brushed DC reduction motor has a permanent magnet. When the armature is powered on, the electrode brush generates a rotating magnetic field to make the rotor rotate. This motor continuously reverses the current direction of the electrode brush through the commutator to achieve forward and reverse rotation of the motor. Brushed DC reduction motors have a simple structure, are easy to control, and have a low cost, but due to the wear of the electrode brushes and the generation of electric sparks, they have a short service life and produce more noise and interference. Brushless DC reduction motor:

The brushless DC reduction motor has a permanent magnet on its rotor, and the armature is replaced by an electronic commutator consisting of several magnetic field sensors and controllers. This type of motor does not require electrode brushes, can achieve contactless and frictionless power conversion, and has the advantages of long life, low noise, and high efficiency. The control of brushless DC reduction motors is more complicated than that of brushed motors, and the cost is also higher, but with the development of technology, its application range is gradually expanding. In summary, DC reduction motors can be either brushed or brushless, and the type of motor to be selected depends on the specific application requirements.

Disassembly of DC reduction motor

The DC reduction motor is based on an ordinary motor with a matching gear reducer. The gear reducer provides lower speed and greater torque. At the same time, different reduction ratios of the gearbox can provide different speeds and torques. When the DC motor is damaged during normal use and needs to be cleaned regularly, we need to disassemble the device. Here are some precautions for disassembling the DC motor:

1. First, remove the external wiring of the DC geared motor and mark it. For asynchronous motors, mark the corresponding three-phase power lines and mark them as corresponding to the external wiring, such as shunt winding and armature winding. Then loosen the anchor screws and separate the motor from the transmission mechanically.

2. Use the tools shown to remove the pulley or coupling on the DC motor shaft. Sometimes it is necessary to add some kerosene to the gap between the pulley motor shaft to make it permeable and lubricating for easy removal. Some shafts and wheels fit tightly, and the wheels need to be heated quickly to be removed.

3. For motors equipped with rolling bearings, the outer cover of the bearing should be removed first, then the fastening screws of the end cover should be loosened, and the connection between the end cover and the frame shell should be marked. The fastening screws of the removed end cover should be screwed into the two screw holes specially set on the motor end cover, and the end cover should be popped out. For motors without such screw holes, the joint between the end cover and the frame can be knocked with a chisel and a hammer to remove the end cover from the frame. If the end cover is heavy, use a lifting device to lift the end cover and gradually unload it.

4. When disassembling the DC reduction motor with a brush, remove the brush from the brush holder and mark the position of the brush centerline when disassembling the equipment.

5. When pulling out the rotor, be careful not to touch the stator coil. If the rotor is not heavy, you can pull out the heavy object by hand. Cover both ends of the rotor shaft with lifting wire ropes, lift the rotor with lifting equipment, and then slowly remove it, paying attention to prevent damage to the coil. Then put a steel pipe at one end of the shaft. In order not to scratch the shaft neck, the steel pipe can be lined with thick cardboard and continue to remove the rotor step by step. When the rotor has moved to the outside of the stator, place a bracket under the rotor shaft end and place the wire rope in the middle of the rotor to pull out all the rotors.

The above is an introduction to the disassembly techniques of DC reduction motors. In order to maintain the equipment for smooth inspection and troubleshooting, it is necessary to disassemble the equipment in some cases so that the internal structure can be clearly seen and targeted repairs can be made to ensure long-term and stable operation.