Not so much Tongmao linear motor in the pumping unit, not as good as Tongmao linear motor in the pumping unit for more accurate application of the inverter. The development of linear motors has a history of more than 100 years. The practical phase is a matter of nearly 30 to 40 years. Nowadays, the applications of linear motors in the developed countries such as the United States, Britain, Japan and Germany have been quite extensive. China is still in its infancy . The past linear motor is mainly used in the field of control actuators, power is small. As the application prospect of linear motor is quite good, the research in this area is very active at present, and great progress has been made in performance and power. Today we take a look at the linear motor AC variable speed drive.
First of all, let us look at the characteristics of linear motors and the requirements of the inverter. At present, most oilfields in the world use the beam pumping unit to mine. Such equipment is very heavy (weighing tens of tons), bulky, difficult to install and debug, High energy consumption, short stroke, does not meet the development of oil recovery industry. In a highly developed science and technology today, all kinds of low energy consumption, small size, light weight of the new pumping unit have come out. Linear motor pumping unit is one of the promising, it is compact, light weight, small size. Its stroke length, stroke time, stroke time, under the red stroke, respectively, continuously adjustable, can be easily achieved: on the slow down, slow down fast, up and down the same speed with the three operating methods. What is the requirement of this motor for the frequency converter that supplies it?
Today we will be based on the technical indicators of 660 V 22KW inverter as an example:
1. Frequency range: 0.2 ~ 9.6Hz, continuously adjustable
2. Starting frequency 0.2Hz, starting voltage Vdc continuously adjustable between 0 ~ 300V.
3.u / f curve shown in Figure 2. Its rated frequency f. Corresponds to the rated output voltage V. The frequency, requirement V. F Can be arbitrarily set.
4. The general operation of the motor mover law shown in Figure 3, in which t1, t2, t3, t4, f1, f2 adjustable requirements. t unit is less than seconds, f unit 0.1H B.
5. Three-phase output voltage, rated 660V, capacity 22KW.
6. Movable movement frequent commutation, requiring a smooth commutation, no impact phenomenon.
Linear motors used pumping unit, there are technically sound problems, but also time recognized by the oil field problems, the basic requirements of the linear motor on the inverter, can be met, of course, need to be improved, there are still many. Tongmao linear motor hotline: 400-007-7724
This article originates from Kunshan Tongmao Electronics Co., Ltd. (
www.tmmotion.com) original company, please indicate the source.
Linear motor