Wednesday, October 9, 2024

Speed ​​regulation method and selection conditions of AC gear motor

1.A brief introduction to AC gear motor

AC gear motor is a device that converts high-speed and low-torque motor output into low-speed and high-torque output, and is widely used in industrial production. The components of AC gear motor include AC motor, reducer and output shaft. The AC motor provides power, the reducer reduces the speed through the transmission of gears, and the output shaft connects the mechanical equipment to provide torque. The reducer is usually composed of components such as gears, worm gears, transmission shafts and bearings. Its working principle is to reduce the speed of the input shaft to the output shaft through the transmission of gears, while increasing the output torque of the output shaft.

2.Characteristics of AC gear motor

‌1.High efficiency: AC gear motor adopts an efficient gear transmission system, which can provide efficient mechanical conversion and reduce energy waste.

‌2.Low noise and vibration: Through precision manufacturing and optimized design, AC gear motor can reduce noise and vibration and provide smooth and quiet operation.

‌3.High reliability: Made of high-quality materials and advanced processes, it has good mechanical strength and durability and can operate reliably under various working conditions.

‌4.Precision control‌: Equipped with precision encoders, it provides accurate speed and position feedback, enabling the control system to accurately control motor movement‌.

‌5.Multiple configuration options‌: Provide different voltages, speeds, output powers and axial mounting methods to meet different application requirements‌.

3.Requirements for AC gear motor selection

1.Load characteristics‌ is one of the key factors in selection. The reduction ratio and output torque need to be determined based on the actual load characteristics of the equipment. If the load is large, a gear reduction motor with a larger reduction ratio needs to be selected to increase the output torque; if the load is small, a gear reduction motor with a smaller reduction ratio needs to be selected to improve operating efficiency‌.

2.Output speed‌ is another important factor. The output speed of the motor needs to match the working requirements of the equipment. If the output speed is too high or too low, it will affect the stability and operating efficiency of the equipment. Therefore, when selecting a gear reduction motor, the output speed needs to be determined based on the working requirements and load characteristics of the equipment‌.

3.Motor power‌ is also an important parameter for selection. The rated power of the motor needs to be determined based on the actual power requirements of the equipment. If the motor power is too low, it cannot meet the working requirements of the equipment; if the motor power is too high, it will waste electricity and cause unnecessary costs. Therefore, when selecting a gear reduction motor, it is necessary to determine the rated power of the motor according to the actual power demand of the equipment.

4.Environmental conditions are also a factor that needs to be considered. The protection level and corrosion resistance of the motor need to be determined according to the working environment of the equipment. If the working environment of the equipment is harsh, it is necessary to select a gear reduction motor with a higher protection level and corrosion resistance to ensure the safe operation of the equipment.

4.Speed ​​regulation method of AC gear motor

‌1.Speed ​​regulation by changing the number of motor poles: The speed of the motor is adjusted by changing the number of motor poles. This method is suitable for application scenarios that require a wider speed regulation range.

‌2.Speed ​​regulation by changing the motor slip rate: The speed is adjusted by changing the slip rate of the motor. This method is suitable for wound asynchronous motors, but the speed regulation range is small, and the resistance consumes power and the efficiency is low.

‌3.Speed ​​regulation by changing the power supply frequency of the motor: The speed is adjusted by changing the power supply frequency of the motor. This method is suitable for occasions that require higher speed regulation accuracy and dynamic performance.

‌4.Serial speed regulation: The speed is adjusted by introducing additional electromotive force in the rotor circuit. It is suitable for wound asynchronous motors and can improve the speed regulation efficiency.

5.Speed ​​regulation of wound motor rotor series resistance: The speed is adjusted by inserting resistance in series in the rotor circuit. This method has a small speed regulation range, but a simple structure and is suitable for some specific equipment such as cranes.

‌6.Stator voltage regulation speed regulation: The speed is adjusted by changing the power supply voltage of the motor. This method is suitable for single-phase motors and some special applications.

‌7.Electromagnetic speed regulation: The speed is adjusted steplessly and smoothly by changing the current of the excitation coil. It is suitable for slip motors, but the control power is small and not suitable for long-term low-speed operation.

‌8.Hydraulic coupling speed regulation: The output speed of the motor is adjusted by the hydraulic coupling. This method is suitable for occasions that require smooth speed regulation.

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