1. Cannot start or the speed is low1) The circuit breaker is faulty and the gate cannot be closed.Analyze and deal with the closing power supply and closing circuit faults.2) The relay malfunctioned.If the vibration or set value of the relay is small, check the relay.3) One phase of the stator winding or the main circuit is open.Check and measure the stator winding and mainline after a power failure, find out the breaking point and repair it.4) The load is too heavy or the machinery being pulled is faulty.Check the motor load and the machinery being pulled. 2. Not synchronized after startup1) The grid voltage is low.Check grid voltage.2) The auxiliary contact of the circuit breaker connected to the excitation device is poorly closed.Check the power outage and repair the auxiliary contacts of the circuit breaker.3) The rotor circuit is in poor contact or open circuit.Measuring the resistance of the rotor circuit should meet the requirements, and carry out fastening inspection.4) The brushless excitation system is faulty, the silicon tube is damaged and there is no output.Replace the silicon tube. 3. Out of step during operation1) The power grid voltage is low, and the out-of-step setting thyristor device is out of control.Check the SCR out-of-step protection device.2) The excitation voltage is reduced.Shut down and check the excitation device.3) The mechanical load is too heavy.Shutdown to check mechanical load.   4. Sparks and smoke appear in the air gap1) The shaft center is not correct or the bearing bush is worn so that the stator and the rotor rub against each other.Shut down to check the air gap between the stator and rotor and make corresponding repairs according to the situation.2) The rotor is broken or the short circuit ring is desoldered.Stop the machine to find out the break point or re-weld the poor contact part.3) Turn-to-turn short circuit or phase-to-phase short circuit of the stator winding; rotor coil disconnection or grounding.Pull the core to check and replace the faulty coil.5. Overheating during operation1) OverloadReduce the mechanical load so that the stator current does not exceed the rated value, monitor the system voltage, current, and    power factor, and adjust in time.2) The insulation between the stator core silicon steel sheets is poor or there are burrs.Shut down to overhaul the stator core.3) There is a short circuit or ground fault in the stator winding.Find the faulty coil and repair or replace it.4) The ambient temperature is too high and the motor is not well ventilated.Check whether the air duct is unblocked, whether the fan is in good condition, and whether the rotation direction is correct.5) The water cooler has no water or the water volume is very small.Check whether the water cooling system is normal.    6. Accident parking1) Cable or cable head wiring failure.Find out the fault point for overhaul.2) The stator winding is short-circuited or grounded between phases.Find the short circuit or grounding point, deal with the faulty coil, and the withstand voltage is qualified.3) The secondary circuit of the current transformer is faulty.Check the secondary circuit of the current transformer, deal with disconnection or poor contact, and verify the volt-ampere    characteristic curve of the current transformer.4) The relay malfunctions.Re-check relay settings and adjust relays.5) The shaft of the motor is locked or the dragged machinery is stuck.Find and fix mechanical problems.6) The excitation device or excitation circuit is faulty.Check and debug the excitation device to eliminate poor contact of the excitation circuit.7) Process interlocking action.Judging the action part of the process interlocking device, finding out the cause, eliminating it and doing a simulation test.7. Severe vibration1) Poor mechanical alignment.Re-align and meet technical requirements.2) The bearing is damaged.Replace motor bearings.3) The static balance and dynamic balance of the rotor are unqualified.Adjust the dynamic and static balance of the rotor.4) The foundation of the motor is uneven and the anchor screws are loose.Check the foundation level and tighten the anchor screws. 

Advantages:1. Compact design and high transmission efficiencyPlanetary gear motors are compact, have high power density, are small and lightweight, and are highly efficient and precise. Its design virtually eliminates recoil and ensures precise motion control.2. Excellent torque transmissionPlanetary gear motors share the load through multiple planetary gears and perform particularly well in applications requiring high torque. Its drive train delivers strong torque output in a stable manner for high load and high demand scenarios.3. High reliability and long lifeThe planetary gear system has been carefully designed to minimize gear misalignment and vibration problems. Its low noise level, excellent repeatability and stable operating performance greatly enhance the reliability and durability of the motor for long-term operation.Disadvantages:1. Higher cost and complex designCompared to other types of motors, planetary gear motors are usually more expensive because of their complex mechanical design and the high level of manufacturing precision required. In addition, maintenance may require more specialized technical support, resulting in higher overall costs.2. Potential operating noise and maintenance difficultiesWhile planetary gear motors are typically quieter, vibration and noise may become more noticeable under high loads or complex operating conditions. In addition, their complex construction can present maintenance and repair challenges.

Micro DC motors are a type of small motors, usually referring to motors with a diameter between a few millimeters and tens of millimeters, small size, and high power. This kind of motor can not be realized without the support of microtechnology, and it can be widely used in automation equipment, medical equipment, aerospace, robotics, smart homes, and other fields. The advantage is that they can be better adapted to the needs of miniaturized devices. Taking portable devices such as cell phones as an example, can provide them with strong power support and help them fulfill various functions. In addition, their small size, light weight, and low energy consumption enable them to adapt to more stringent working conditions, while also reducing equipment costs and energy consumption. Their structure can be divided into four parts: rotor, stator, magnet, and circuit. The rotor usually consists of an iron core, shaft, bearing, guide plate, and winding; the stator consists of the iron core, coil, conductor, and so on. The magnet is an important part, which serves to form a magnetic field between the stator and rotor to convert electrical energy into mechanical energy. The circuit plays the role of controlling and transmitting electrical energy, mainly including power supply, switch, sensor, integrated circuit, etc.There are many micro motors in automobiles. With the popularity of electric vehicles and the improvement of various configurations, more micro motors are used in automobiles. Typically, a car is equipped with an automotive generator and multiple automotive micro motors (15-20 on average), while high-end luxury sedans require 60-70 micro motors, and high-end new energy vehicles require hundreds. An automotive air conditioning system can drive various valves in the automotive air conditioning system to control the direction and temperature of airflow to meet the driver's comfort needs. Compared with the traditional pneumatic drive method, there is no need to add complex piping and air circuits, which saves more space and energy. Car Seat Adjustment System can be used to drive car seat adjustment systems, such as seat height, backrest tilt angle, headrest height, etc. In these systems, it can provide more precise control and adjustment ability, bringing a more comfortable experience to the driver. The window lift system can provide power support for the window lift system, making window operation more convenient and easy. Compared with the traditional manual operation, it can make the window lifting and lowering smoother and faster, and also avoid the window shaking or jamming. Car mirror adjustment system also plays an important role in car mirror adjustment system. Driven by a motor, the driver can easily adjust the mirrors electronically to make them more customized to the driver's individual needs. Therefore, you can find out the number of micro motors in the car configuration and roughly determine the low and comfortable luxury level of the car configuration!Engine part: mainly applied in the automobile starter motor, EFI control system, engine water tank radiator, generator, and these parts.Automotive chassis frame: chassis frame micromotors are used in electronic suspension control systems, dynamic power steering, automotive stability control systems, cruise control systems, anti-lock lock control systems, and drive power control applications. Most use permanent magnet DC motors or permanent magnet stepper motors.Body parts: such as central door locking device, power mirrors, automatic lifting antenna, power sunroof, automatic headlights, HUD, air-conditioning door control, automatic window lifter, window anti-pinch device, power wipers, power tailgate, power seats, and other auto parts.