Gear pump matching motor: How to distinguish whether it is equipped with a reduction motor or a variable frequency motor? What is the difference?

Advantages of reduction motor: 1. Space saving, reliable and durable, high overload capacity, power up to 95KW or more. 　　 2. Low energy consumption, superior performance, reducer efficiency as high as over 95%. 　　 3. Small vibration, low noise, high energy saving, high-quality segment steel material, rigid cast iron box body, and high-frequency heat treatment on the gear surface. 　　 4. After precision processing to ensure positioning accuracy, the gear reduction motor that constitutes the gear transmission assembly is equipped with various motors, forming electromechanical integration, which fully guarantees the quality characteristics of the product. 　 5. The product adopts the design concept of serialization and modularization, and has wide adaptability. This series of products has an extremely large number of motor combinations, installation positions and structural plans. Any speed and various structural forms can be selected according to actual needs. 6. Easy maintenance and low cost, advantages of variable frequency motors with mature technology: 1. It has a starting function 2. It adopts electromagnetic design to reduce the resistance of the stator and rotor 3. It is suitable for frequent speed changes under different working conditions 4. It saves energy to a certain extent 2. It is not suitable to use a reduction motor under the following working conditions 1. The hard start of the equipment has a greater impact on the power grid, and soft start is required 2. The same equipment needs to transport materials of different viscosities , or the same equipment transports the same material but requires different flow rates. 3. The equipment requires stepless speed regulation, which is not very suitable for variable frequency motors under the following conditions: 1. The budget does not allow it. 2. The equipment itself needs to have a constant speed with little fluctuation. 3. The impact on the power grid is small when the equipment is hard started. In summary, it is obvious that these two motors are not interchangeable in all situations. I don’t know if the answer is correct, please correct me.

Friend upstairs, but there are also reducers that can adjust the speed mechanically.

Regardless of economics, which method is more convenient?

Reply 3# lxn_663 Leaving aside the economical type, which method is more convenient and capable of automation?

This post was last posted by FLYTOINTER on 2010-7-7 11:20 Editor, let me share my opinion. If the speed is not constant after speed regulation, you can consider when the frequency converter occupies a tight space. You can consider when the frequency converter needs soft start. You can consider when the frequency converter needs to provide a variety of protections, such as over-power, under-power, etc. You can consider when the frequency converter is one-to-many. One frequency converter controls multiple motors. You can consider the frequency converter. When the speed is required to be constant after speed regulation, I think the speed reducer is also suitable for the following situations: The flow requirements of Xubei better pumps do not change much, and the flow rate changes less than 10%. For example, 10 cubic meters in normal times, and now it requires 9 cubic meters. At this time, the reducer should be better, because the energy-saving advantage of the frequency converter can only be reflected when the flow rate changes by more than 20%. When the purchase cost of the pump unit is low, the frequency converter is more expensive, and the owner generally prefers a speed reducer. In addition, as mentioned above, a speed reducer can also be used when soft start is not required.

Judging from the matching situation of the pumps we produce now, most of them are equipped with reduction motors. Those with variable frequency motors are the special requirements of customers. The difference between the two is already very clear as mentioned above. If we consider various aspects such as economy, use, and maintenance, reduction motors are a more suitable choice.

Variable frequency motors can be controlled automatically, but it seems impossible to use speed reducers.

In terms of economy, what is the difference between an ordinary motor + reducer and a variable frequency motor? I would like to ask you.

The frequency converter is equivalent to changing the frequency of the power supply. Within its effective range, the speed can be adjusted steplessly. Specifically: Usually the power supply is 50HZ. This number can be changed through a frequency converter, which is equivalent to changing the speed of the motor. The frequency converter has the function of soft starting, which can reduce the impact on the power grid when a large motor is started. However, the use of frequency converters requires adding corresponding motor control points. It is best used when the working conditions change frequently.

From personal experience, it depends on the power of the motor. From an economic point of view, it is better to use a frequency converter and deceleration to control the speed, or a speed reducer. We usually consider that power above 10KW can be controlled by a frequency converter, because it can protect the motor from burning out. Below 10KW, frequency converter control is not considered, because the maintenance cost after the motor of this specification burns out is not too high. I wonder what the original poster thinks?