Differences of Small Gear Motors

-

 People might get confused when talking about small gear motors since there are so many types of gear motors. When it comes to a small gear motor, we need to have some basic ideas about it. The micro gear motor is a combination of a micro gearbox (reducer) and an electric motor. With this gear reducer system, the gear motor can be used for low-speed and high torque applications. According to the motor adopted, the gear motor can be categorized into small brushless DC motor, small brush DC motor, micro stepper gear motor and servo gear motor, etc. How to differentiate these micro gear motors becomes a big problem. This passage will make a contrast on the similar gear motors and explained them in detail.

 

These types will be divided into 2 sets: small brushed DC gear motor VS small brushless DC gear motor, small stepper gear motor VS small servo gear motor.

 

mini dc motor

 

Small Brushed DC Gear Motor VS Small Brushless DC Gear Motor

 

The main difference between a small brush DC gear motor and a small brushless DC gear motor lies in the motor: one is the brush DC motor and the other is the brushless DC motor. About the definition and working principle, Brushless VS Brushed Motor: What’s the Difference can be referred to. This passage will focus on prominent differences.

 

1.Scope of Application

Brushless DC Gear Motor: usually used for equipment with relatively high control requirements and relatively high speed, such as aircraft models, precision instruments, etc., which have higher requirements for the motor speed and high-speed control.

Small dc motor brushes: usually used for power equipment, such as hairdryers, household range hoods, etc. In addition, the speed of the brush DC motor can reach very high. However, due to the wear of the carbon brushes, the service life of brush motors is not as long as brushless motors.

 

hairdryer motor

2. Service Life

Small brushless dc motor: the service life is about tens of thousands of hours, but it may differ due to different bearings adopted.

 

Small dc motor brushes: Generally, the continuous working life of a brush motor is about 1,000 hours. When the use limit is reached, the carbon brush needs to be replaced, otherwise, it is easy to cause bearing wear.

 

3.Use effect

Small brushless dc motor: Digital frequency conversion control technology is generally adopted, enabling strong controllability. The speed can vary from a few revolutions per minute to tens of thousands of revolutions per minute.

 

Small dc motor brushes: The old carbon brush motor generally works at a constant speed after starting, and the speed adjustment is not easy. The brush DC motor can also reach 20,000 rpm, but the service life will be relatively short.\

 

4. Energy Saving

Relatively speaking, the brushless motor controlled by inverter technology will save much more energy than the brushed DC motor.

 

5. Maintenance

The carbon brush needs to be replaced after long-time use. The brush motor will be damaged if not replaced in time. While the brushless motor has a relatively long service life, usually more than 10 times that of the brush motor. A Brushless DC motor doesn’t need daily maintenance. If it is broken, the motor needs to be replaced.

 

Small Stepper Gear Motor VS Small Servo Gear Motor

 

1. Control Method

The control method of the stepper gear motor and the servo gear motor is different. For a micro metal geared stepper motor, the rotating angle is determined by the pulse number. Each pulse corresponds to a step angle. However, there is no feedback signal, which results in the accurate rotating position of the motor unknown and the position accuracy not high enough.

 

The servo gear motor controls the rotating angle by the number of pulses as well. What differentiates them is the feedback signal. Each time the servo motor rotates at a certain angle, the corresponding number of pulses will be sent. At the same time, the drive will receive the feedback signal and compare it with the pulse received by the servo motor, so that the system will analyze the difference in the pulse number. The rotation of the motor can be controlled very accurately, so as to achieve precise positioning, which can reach 0.001mm.

 

2. Overload Capacity

Stepper motors generally do not have overload capacity while an AC servo motor has a strong overload capacity. Take the Pilz servo system as an example, it has speed overload and torque overload capabilities. Its maximum torque is 3 times the rated torque, which can be used to overcome the instant inertial load at the starting moment.

 

 

3. Responding Time

The response speed performance is different. It takes 200 ~ 400ms for a micro metal geared stepper motor to accelerate from a standstill situation to the working speed (generally several hundred revolutions per minute). The acceleration performance of the AC servo system is better. Take the Pilz AC servo motor as an example, it takes a few minutes to accelerates from a standstill situation to its rated speed of 3000 r/min. It can be used for applications where fast start/stop and high position accuracy is required.

 

With the detailed contrast on the general small gear motors, it won’t be difficult for you to select the suitable gear motor for your specific application. ZHAOWEI provides various brushed DC motors, BLDC gear motors, servo gear motors, stepper gear motors of different specifications. And the parameters, such as diameter, voltage, speed, reduction ratio can be customized.


post from: https://www.zwgearbox.com/news/faq/differences-small-gear-motors.html

评论

发表评论

此博客中的热门博文

Heat treatment method of planetary reducer

-
Choosing good material of planetary reducer is conducive to improving the bearing capacity and service life of gear reducer. In view of the structural characteristics of precision reducer and the load characteristics of gears, hard tooth face gears should be widely used. There are many heat treatment methods to obtain hard face gear. For example, surface quenching, whole quenching, carburizing quenching and nitriding should be selected according to the characteristics of gear reducer. 1. Surface hardening The common surface quenching methods are high frequency quenching (for small size gears) and flame quenching (for large size gears). When the hardened layer of surface hardening includes the bottom of the tooth root, the effect is the best. The hardness of tooth surface can reach 45-55HRC. 2. Nitriding The application of nitriding can ensure that the gear can achieve high hardness and wear resistance under the condition of minimum deformation. After heat treatment, ...
阅读全文

How to solve the wear fault of gear reducer

-
Gear reducers are generally used in low-speed, high-torque transmission equipment, but in fact gear reducers are often used in high-speed mechanical environments, so it is inevitable to withstand multiple types of friction. If not protected, wear failures are likely to occur. Such problems often occur, so we should learn to deal with these wear and tear. There are three kinds of wear faults of the gear reducer. One is the wear of the bearing chamber of the gear reducer, which includes the wear of the bearing housing, the bearing housing of the housing, and the bearing housing of the transmission. The second is the shaft diameter of the gear reducer gear shaft wear, the main wear parts are in the shaft head, keyway and so on. The third is the bearing wear of the gear reducer drive shaft. For the wear failure of the gear reducer, the traditional solution is repairing after repair welding or brush plating, but both have certain drawbacks. Generally, the thermal stress generated by th...
阅读全文

DC Reduction Gear Motors manufacturer

-
图片
The DC Gear motor , consisting of a DC electric motor and a gearbox, is at the heart of several electrical and electronic applications. ZHAOWEI have been designing and developing such high quality mini DC gear motors in an easy-to-mount package for a range of products and equipment. Our miniature gear motor work smoothly and efficiently, supporting these electrical and electronic applications. These geared motors have reduction gear trains capable of providing high torque at relatively low shaft speed or revolutions per minute (RPM).  ZHAOWEI DC geared motors reduce the complexity and cost of designing and constructing applications such as industrial equipment, actuators, medical tools, and robotics. ZHAOWEI has engineered a range of planetary and spur gear motors (also known as mini-geared motors and micro-geared motors) suitable for many future and existing applications. The main characteristics of these gear motors are miniature form factors, offering significant strength...
阅读全文