In many materials or literatures, industrial automation automation products are described as power-saving and energy-saving control automation products. Therefore, many people think that as long as the equipment is equipped with an inverter, it will save energy and electricity. This is not the case. . Industrial control automation products, the inverter itself, is a misunderstanding of energy saving. Whether the inverter can achieve the effect of power saving and energy saving depends on the actual situation used.
Misunderstanding 1. Many people think that the torque of two motors does not reach the rated torque of the motor (frequency, speed is still the same 50HZ), the inverter will also play a role in energy saving, which is a mistake.
Misunderstanding 2, two identical motors are working at 50Hz power frequency, one uses the inverter, one does not, and the speed and torque are in the rated state of the motor. I believe most people will think which one uses the inverter motor. Will compare energy saving. In fact, this is also a wrong idea.
Misunderstanding 3, the same conditions, many people think that it can save a lot of power in the no-load state, but in fact, the drag-type load can not save much power.
The reason why the frequency converter can achieve the effect of power saving and energy saving in most cases is that the frequency converter controls the speed of the motor, but in fact, most of the speed control equipment can achieve this effect because Obviously, we cannot conclude that the inverter is an energy-saving product.However, due to technical and cost reasons, it is not widely used. In recent years, RFID technology has developed by leaps and bounds. With the development of large-scale integrated circuit and network communication technology, RFID technology has entered the commercial application field, and began to develop from the initial low frequency (125kHz) and high frequency (13.56mhz) to uHF (860 ~ 960MHz) and microwave. RFID technology has become one of the most promising information technologies in the new era because of its unique advantages showing great development potential and application space. In both low and high frequency bands, China has independently developed RFID chips in accordance with ISO14443 A, B and ISO15693 standards, which have been successfully applied in major projects such as city bus all-in-one card and second-generation resident ID card. However, in the uHF and microwave field, China started late, technology and products are still relatively short. In this context, this paper studies the design of 915MHz rf card reader. The system can be applied to vehicle monitoring, remote control, telemetry, access control system, identity identification, non-contact radio frequency smart card, wireless 485/232 data communication, safety and fire prevention and other fields.
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