With the continuous development of the economy and the continuous improvement of people’s living standards, the demand for energy is getting higher and higher. At the same time, problems such as environmental pollution and climate change are also intensifying. Against this background, improving energy utilization efficiency and reducing energy consumption have become common challenges for all countries. Permanent magnet motor as a new type, high efficiency, energy saving motor, its energy saving effect has attracted much attention. Today we look at the principle and advantages of permanent magnet motors, and also share with you two cases of energy-saving Minten low-voltage permanent magnet motors in the field of metallurgy and environmental protection.
The basic principle of permanent magnet motor
Permanent magnet motor is a kind of motor that utilizes the interaction between the magnetic field generated by permanent magnets and electric current to convert electric energy into mechanical energy. Its basic structure includes a permanent magnet, stator and rotor. The permanent magnet serves as the magnetic pole of the motor and interacts with the current in the stator coil through its own magnetic field to generate torque and transfer mechanical energy to the rotor, realizing the conversion of electrical energy to mechanical energy.
Compared with the traditional induction motor, permanent magnet motor has the following advantages:
1. High efficiency: Traditional induction motors have low energy efficiency due to the fact that their magnetic field is generated by the current in the coil and there are induction losses. While the magnetic field of permanent magnet motor is provided by permanent magnets, which can convert electrical energy into mechanical energy more efficiently. According to relevant studies, the efficiency of permanent magnet motors has increased by about 5% to 30% compared with traditional induction motors.
2. High power density: The magnetic field strength of permanent magnet motor is higher than that of induction motor, so it has higher power density.
3. Energy saving: As permanent magnet motors have high efficiency and high power density, this means that they can output more mechanical power with the same input power in the same volume and weight, thus realizing energy saving.
The replacement of inefficient asynchronous induction motors by permanent magnet motors, combined with the correction of operating conditions and frequency control of old and inefficient energy-using equipment, can greatly improve the energy efficiency of energy-using equipment, and the following 2 typical application cases are for reference.
1: a group in Guizhou reel motor transformation project
September 25, 2014 – December 01, 2014, in anhui mingteng permanent magnet electromechanical equipment co., LTD and a group in guizhou a branch factory wire drawing workshop wire drawing section 29 # straight into the wire drawing machine, 1 #, 2 #, 5 # reel motor energy consumption tracking record comparison, will anhui mingteng permanent magnet motor and the current use of inverter motors for energy consumption comparison.
(1) Theoretical analysis before the test is shown in Table 1 below
Table 1
(2) Measurement methods and statistical data recorded and compared as follows
Installation of four three-phase four-wire active power meter and metering device fitted with a current transformer, the ratio is: the total meter 1500/5A, No. 1 reel machine sub-meter 150/5A, No. 2, No. 5 reel machine sub-meter 100/5A, the data displayed on the four meters for tracking records, statistical analysis is as follows:
Table 2
Note: No.1 Reel motor four-pole 55KW, No.2 Reel motor four-pole 45KW, No.5 Reel motor six-pole 45KW
(3) Comparison of similar working conditions.
In 29 # machine No. 5 reel machine (permanent magnet synchronous motor) and No. 6 reel machine (asynchronous motor) inverter power input device power meter level 2.0, constant 600:-/kw-h, active energy meter two. Metering device fitted with a current transformer ratio of 100/5 A. Comparison of the two motors in very similar working conditions of the stored power energy consumption, the results are shown in Table 3 below.
Table 3
Note:This parameter is real-time measurement data, not the average data of the whole machine operation.
(4) comprehensive analysis.
To summarize:The use of permanent magnet motors has a higher power factor and lower operating current than inverter motors. Permanent magnet synchronous motor than the original asynchronous motor active power saving rate increased by 8.52%.
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2:Centrifugal fan renovation project of an environmental protection limited company
The project through the frequency converter speed regulation, so that the permanent magnet motor slowly start, and finally reach the rated speed, a perfect solution to the self-starting permanent magnet motor in the centrifugal fan when the problem of synchronization involved. In addition, it not only solves the mechanical impact on the centrifugal fan when the motor starts and reduces the failure rate of the centrifugal fan, but also the comprehensive efficiency of the motor will be further improved.
(1) Parameters of the original asynchronous motor
(2) Basic parameters of permanent magnet frequency conversion motor
(3): Preliminary analysis of power saving benefits
Fans, pumps as industry, agriculture, life of general-purpose machinery, with a large number of applications, the application of a wide range of characteristics, its supporting motor power consumption is also huge. According to statistics, the motor system power consumption accounted for more than 60% of the national power generation, while fans, pumps accounted for 10.4%, 20.9% of power generation. Due to the capacity and process reasons, the system regulation is relatively backward, most of the fans and pumps are regulated by mechanical interception, low efficiency, more than half of the fans and pumps loads exist in varying degrees of electrical energy waste, in the increasingly tense supply of energy today, to reduce the waste, saving electrical energy has been a top priority.
Anhui Mingteng has always been committed to the production and research and development of more efficient and environmentally friendly permanent magnet motors, which are widely used in the industrial fields of iron and steel, coal mining, building materials, electric power, petroleum, chemical industry, rubber, metallurgy, textile and so on. Low-voltage permanent magnet motors in the 25%-120% load range, compared with the same specification asynchronous motor has a higher efficiency, wider economic operation range, with significant energy saving effect, looking forward to more enterprises to understand the permanent magnet motors, the use of permanent magnet motors.
Post time: Mar-11-2024