For the role of mini planetary gearbox wholesale, the simplest understanding is that the reducer is to change the speed and output torque, providing large torque and low speed. The speed ratio of the reducer = input speed/output speed, if the speed ratio is 100, the output torque is about 100 times the input torque. (The speed slows down and the torque increases) the reducer is also a speed change machine, but the general speed change machine is used to slow down, and it is used to call the reducer; The general reducer is a fixed transmission ratio, and there are adjustable, but it is generally a graded speed regulation. It is easy for everyone to think that the car has a adjustable speed reducer, so the car has several gears, the gasoline engine (diesel engine) is like the motor, and the accelerator speed can change, but the change range is not large.

Of course, the clutch and the reducer are not the same thing, but generally speaking, when it comes to the reducer, it is easy to think of the car change speed, think of the credit of the clutch, in fact, each change is completed after pulling the shift lever. Generally, the adjustable transmission machine can not be loaded when changing gear, so it is necessary to separate the output of the reducer from the car through the clutch, and then connect after changing gear, the clutch is just a coupling (but it is separable and can be closed).

The law of conservation of energy tells us that the output power of the motor cannot change for no reason, and it can only become thermal energy because of various losses. The power is constant, the speed is reduced, and the force (moment) is increased; When the same output power, the (Angle) speed is inversely proportional to the force (moment), and the general reducer also has energy loss, and the efficiency is 70%-99%.

If it is used for low-speed occasions, can only use an ordinary low-speed motor? Or a servo motor? Using only an ordinary low-speed motor, of course, it is not possible, because :1) the speed is generally not up to: in general, the number of reducers can be as low as 3:1 or even smaller, and can also be higher than 180:1 or even larger. That is to say, when the ordinary motor speed is 1380 RPM (4-pole motor), the output speed of the reducer can be as high as 460 RPM or even greater, and it can be as low as 7.6 RPM or even smaller. And ordinary motor can achieve such a large speed range? Even if it is a multi-pole variable speed motor, the speed of the fastest 2-pole motor is about 2880-2970 RPM, and the speed of the lowest 12-pole motor is about 480-490 RPM. If only a few tens of RPM is needed, the ordinary motor will not work.

2) The torque of the ordinary motor is generally not up to: the load required to operate at a low speed generally requires a relatively large torque (such as elevators, elevators, production lines, winding machines, etc.), even if the speed of the ordinary motor meets the requirements, the torque is often not just in line with the requirements. Note that the mechanical guide rail is prone to "crawling" at low speed.

Is it possible to use only one AC servo motor for low speed applications? That also points to specific different cases: there is no problem with AC servo motor for low speed operation (servo drive has a built-in electronic gear, can be set arbitrarily, but it is recommended that 1/50≤ reduction ratio ≤50). However, the same speed meets the requirements, the torque may not be able to meet the requirements, if the torque also meets the requirements, of course, it is the first best solution.

If the torque does not meet the requirements, it can be subdivided into two different configuration schemes:

A) High-power AC servo device (AC servo driver + servo motor) scheme;

B) Low power AC servo + reducer scheme.

A) In the case of no special requirements for position accuracy, the choice of high-power AC servo device scheme due to its high cost, and low-power AC servo device + reducer scheme, compared with the cost advantage is not obvious.

B) However, if there are high position accuracy requirements, although the use of high-power AC servo device program cost is higher, but the position accuracy requirements are guaranteed; The low-power AC servo device + reducer scheme, due to the existence of mechanical gear backlash in the reducer, the position accuracy is to make some sacrifices. The final plan should be determined according to the specific equipment, design objectives, technical indicators, precision requirements and other factors.

C) In addition, the torque rotor inertia of the motor must be taken into account.

How to choose servo motor and reducer? For example, choose a motor with 750W inertia, choose a reducer with a reduction ratio of about 60, how should you choose? Note when selecting:

1) Make sure your load rated torque is less than > the rated output torque of the reducer.

2) The rated torque of the servo motor (multiplied by) x deceleration ratio is greater than the rated torque of the load.

3) The moment of inertia of the load converted to the servo motor by the reducer should be within the range allowed by the servo motor.

4) Confirm that the precision of the reducer can meet your control requirements.

5) The structure form of the reducer, the appearance size can meet the requirements of the equipment, and at the same time can be connected with the selected servo motor. In addition to the gear ratio of the reducer, the output torque, the axial force of the output shaft and the radial force check; Also depends on the transmission accuracy of the reducer, according to the working conditions. Because the transmission accuracy is high and the price is high, as long as the motor and reducer are matched to meet your requirements (function and performance), it is OK. Technical indicators to meet the requirements, material cost moderate price, is a good program.

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