TVF Series: Permanent Magnet Synchronous Variable Frequency Motor For Rod Pumping Unit

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Permanent magnet synchronous variable frequency motor for rod pumping unit is a new type of oil field beam pumping unit drive system product independently developed and designed by Huaxin Electric based on permanent magnet variable frequency core technology. Compared with the drive system device, the belt drive system is removed and the ultra-thin body is used to directly drive the reducer input shaft, which is efficient, energy-saving, safe and reliable.Using the technology accumulated for many years, the company has perfectly combined the design and control technology of modular permanent magnet motor from two aspects of electrical and mechanical structure, so that the rod pump load and motor torque are optimized synchronously, the static and dynamic balance is well matched, and matched with the operating characteristics of pumping unit. Through the rapid response of electromechanical integrated system and software optimization control, the system the is simple and basically maintenance free

The permanent magnet direct drive system adopts many advantages such as "module split installation, frequency conversion flexible drive and system intelligent pumping", which is especially suitable for energy-saving upgrading of existing pumping units.

The permanent magnet motor eliminates the transmission parts such as belt, reduces the floor area of oil production equipment and improves oil production efficiency. At the same time, the motor has simple structure and convenient installation. The performance and overall dimensions of the motor can be customized according to customer needs.

1.Improve the transmission efficiency of the system

The power saving rate of the driving system of semi direct drive pumping unit is about 10-30%, because there is no belt reduction mechanism with transmission loss of 10% - 20%, and the efficiency of permanent magnet motor is close to the rated load efficiency at low load.

2.The balance weight can be started and stopped at any position

Due to the strong overload capacity and large starting torque of the permanent magnet direct drive motor, it can start and stop when the balance weight is at any position. And the operation is stable, which greatly facilitates the on-site personnel to meet the special operation requirements and reduces the number of well flushing.

3. Wide range of stroke adjustment

The strike can be adjusted continuously from 0.1 times per minute to more than 12 times (design rated strike number), and the operation is stable. So that the pumping unit can adapt to the inter pumping well to the high-yield well, completely solve the problem that the change of oil well liquid supply needs to change the number of strike times in a wide range, and eliminate the workload of replacing mechanical parts such as belt pulley for manual adjustment.

4. Permanent magnet semi direct drive motor has strong overload capacity

Low frequency startup, frequency conversion control and synchronous operation are adopted, so that the pumping unit has the hardware basis of intelligent operation control. The system can cope with the complex operation conditions of the pumping unit, adapt to the operation requirements of various well conditions, and significantly improve the performance and function of the traditional pumping unit.

5. Realize multi-objective optimization flexible intelligent control

Permanent Magnet Motor is a kind of synchronous motor, so there is no slip, the speed is stable, and it will not lose rotation under increased load. Because the belt is eliminated, there is no slip problem, so the speed can be measured without sensor, and then the strike times and controlled strike times can be calculated. A multi-objective optimization model can be designed to control the objectives such as minimizing alternating load, minimizing active power, maximizing pump efficiency and maximizing displacement under a certain strike times.

6. Real-time monitor working conditions and remote control operating parameters of pumping units

Because the permanent magnet motor and the pumping unit are rigidly connected, the torque and speed of the motor can obtain the power diagram and working condition of the rod pump in real time, realize the remote app tracking operation, reduce the failure time and maximizing production capacity.

7. Energy Saving

The permanent magnet direct drive motor has small loss and maintains good efficiency from light load to full load. The variable speed control makes the oil well liquid supply and liquid production balanced. The motor, rod and pump work synchronously and harmoniously, which further improved the system efficiency.

The main focus of permanent magnet semi direct drive motor is energy-saving application, and the control is relatively simple. Its greater advantage lies in digitization and intelligence, which greatly improves the performance and function of traditional pumping units, improves the production efficiency, greatly increases the stability and safety of oil production equipment, and effectively reduces the failure and maintenance cost.

8. The system adopts beltless transmission mechanism to improve the service life of components and reduce the maintenance cost

The system has no belt drive mechanism, and the motor is directly installed on the shaft extension of the reducer, eliminating the belt mechanism that is easy to cause personal injury, so as to make the operation of the system safer.

The biggest harm of reducer for pumping unit is that the belt will exert a unilateral tension on the reducer, resulting in eccentric wear of reducer bearings and supports, reducing the service life of parts and increasing the workload of repair and maintenance. Replacing the belt structure with permanent magnet semi direct drive system improves the service life of the reducer.

There is no need to maintain the belt reduction mechanism, which saves the initial cost and later maintenance cost of the belt reduction mechanism.

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