Using motor no-load magnetization curve to adjust data to reduce temperature rise

Reduce the temperature rise by adjusting the data using the no-load magnetization curve of the motor. Changzhou Senyuan Switchgear Co., Ltd. Jiangsu 213014, Yang Keqin The best solution However, some of the design data and parameter performance of the motor are interrelated and restrict each other. Adjustment is often complicated and Difficulty Through the principle analysis and practice summary, the no-load magnetization curve of the motor can be used to analyze the saturation degree of the magnetic circuit, and the corresponding adjustments can be made to find out the corresponding adjustments to effectively solve the design problem of the no-load characteristics of the requested descriptor design data. The new motor products must meet both the user requirements and the motor technical conditions, and strive to be economically reasonable. In the trial production process, the design data must be repeatedly adjusted to determine the optimal design parameters of the motor and the related parameters. Performance materials, etc., will all have an impact and cause corresponding changes. They are mutually restricted and they are often complicated. How to pass the experiment, get accurate situation, find out the reasons, and seize the key, the right medicine is a very important and practical way in the design and trial production of the motor. 1 Use the magnetic saturation curve to determine the saturation of the magnetic circuit. According to the user's requirements During the design trial of the special small-differential motor, the motor temperature rise was too high. According to the adjustment measures to reduce the temperature rise described in the related books of asynchronous motor, etc. Only by taking appropriate measures to reduce the stator winding turns and the large stator winding wire cross section, the company has achieved the goal of reducing the temperature rise of the motor by reducing the mass loss, but the result is counterproductive and the temperature rise of the motor is higher. Intensive research conducted extensively through 1 step, through experiments, to make the motor no-load magnetization curve, analyze the saturation of the magnetic circuit of the motor and found that the magnetic circuit of the motor has been saturated, and the iron loss is approximately proportional to the square of the magnetic density, such as Reducing the number of turns of stator windings from phantom reduction to 31 iron consumption increased by about 51,512 people, resulting in an increase in iron consumption. Although the number of stator winding turns decreases, the stator winding resistance decreases, but the excitation current decreases. 12 Tears 2, large, the magnetic circuit is more saturated, and the copper consumption of the stator is proportional to the square of the current, so that the copper consumption is not reduced, but is rather larger. Therefore, after adjusting by the above method, the copper consumption of iron consumption continues to be 1; Insulation is obtained by type test. The stator winding temperature rise resistance method reaches 85 when the continuous cycle operation exceeds the temperature rise limit value of 801 pages. The stator winding temperature is set at the fixed voltage and frequency. 30 set winding temperature, and the resistance method 1 reaches 931 exceeding the temperature rise limit value. 90 After analysis, the following methods can be used to test and judge by 1 wiring, carry out no-load experiment. When the motor starts, disconnect the switch and only the main winding is used for no-load operation.

While keeping the no-load speed constant, adjust the voltage, measure the no-load voltage of the corresponding point, and make the no-load magnetization curve of the no-load current. =, So when the machine for empty transport operations.

The magnetic flux of the magnetic circuit and the excitation current, the relationship curve 1 =, when it is a constant, the stator winding EMF = load current. The weight of enthalpy in the work is very small and can be ignored. In fact, it can be used with no-load curves, =, substitutions, and relation curves.

The origin of the coordinates, for the no-load curve, 4, this is the gas point as the axis of the hall line cross 0 Yu. The no-load curve at 1 line 50 is the magnetic potential required for the air gap, which is the magnetic force required by the core portion of the core and the increase of the phase temperature by the phase temperature. , Wan Wan heart decoration. To find a business, potential, 5 is the total magnetic potential 2(3) required in the magnetic circuit to find the full-size air gap magnetic potential.

The saturation factor in motor design is based on the rated operation of the motor. The air gap defines the ratio of the required magnetic potential of the rotor tooth to the required magnetic potential of the air gap, that is, lF2. The saturation coefficient obtained in the no-load experiment, the original, and the saturation coefficient of the centrifuge are The same, but the appropriate range of saturation coefficient slightly 羌 According to the relevant information and practical experience, the electric motor 6 will compare the obtained value with the normal range to determine the saturation of the magnetic circuit. The rated voltage of the motor is 22 psi. People = 3 = .64, then the magnetic circuit through the Shanghai Machine 2 according to the whereabouts. Take measures to adjust the phase winding EMF 1 = 4.441 妒 1 person 1 hunter winding coefficient has been determined to take bucket.

妒 常数 常数 常数 常数 常数 常数 常数 常数 常数 常数 常数 常数 常数 常数 常数 常数 常数 妒 妒 2 2 2 2 2 2 2 2 2 2 2 2 2 2 2 2 2 2 2 2 2 2 2 2 2 2 2 2 2 2 了 了 了= 1.49. In the normal range 1, the division number should be increased by 1.048 times, and the number of turns of the primary winding per pole is 310 7 views. If the number of turns is adjusted to 325 turns, then 3 = 翌 = 80. Exceeding the range of 8 hand-embedded wires, it will lead to difficult to rule, so the actual adjustment is 320匝79.57, which is in line with 8 off, then the original iron core length 58 is increased by 2 and the roundness is adjusted to 60. The motor runs in continuous cycle. Stator winding temperature rise resistance method is reduced to 73.5, ± when the turn 3,1, the stator winding temperature rise resistance method is reduced to 82.3 in line with the temperature rise limit value which can be, by using the motor no-load magnetization curve, adjust the relevant data , To reduce the magnetic circuit oversaturated, can significantly reduce the motor machine design trial production due to excessive saturation of the magnetic circuit appears over the relevant technical performance indicators of the same problem, this method can also be used to determine the magnetic circuit undersaturation of the motor, make corresponding Adjustment so that the motor meets the technical conditions In addition, the economic relationship continues to be connected to page 31 1 to me as 31610. Most power grids have transformers with ungrounded or arc-suppressed coil neutrals. Protection usually requires only a ground signal and no tripping. Short-delay on the 3rd generation 601 power grid in the few resistance transformer neutral grounded high-resistance grounded power grid, protection action in the trip, its action current 2., should escape the Tun Moot during the start-up process by the corpse incomplete flow Symmetrically occurring 3 times unbalanced zero-sequence current with delay setting of 0.58. This delay avoids the influence of phase-to-phase short-circuit current-sequence protection. 6 Conclusions Over-loading of negative sequence protection over the body Asynchronous motor microcomputer type comprehensive protection of the protection of the wide coverage of asynchronous motors all types of normal fault rejection. With the ideal protection performance and intelligent fault diagnosis function on-site operation, the protection function is strong, and the performance-cost ratio is high. The mourning is stable and reliable. It has a good prospect of popularization and application. 1 Intelligent comprehensive protection of high-voltage asynchronous motor. Relay, 19961.

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