Electric fan motor is an important part of the electric fan, its performance parameters are good or bad to a large extent determine the quality of electric fan products, therefore, many maintenance master in the actual operation process will choose the motor as the entry point, and then specifically analyze the relevant fault problems. Today is the introduction of the electric fan motor good or bad measurement method and how to use the multimeter to detect the electric fan motor good or bad step by step detailed answers.
A, how to measure the electric fan motor good or bad
The method is as follows: the electric fan motor has five lines.
Are: 1 gear, 2 gear, 3 gear, 2 capacitor lines.
Generally speaking, in addition to individual motors, three gears of the line color is red. Blue. Green. The capacitor is connected to the black and yellow. Then start, the motor’s five lines are detached.
1, first of all, the multimeter gear to the mother file, the red pen connected to any one capacitor line, the black pen connected to 1 file.
2, first note down the resistance value, and then measure the 2nd and 3rd gear, normally, the greater the measured gear, the greater the resistance value between it and the capacitor line, such as the 1st gear is 70 ohm. 2nd gear 110 ohm. 3rd gear 150 ohm so.
3, you can write down and then compare. In other words, if you measure the resistance value of the above three gears are infinity, or a gear is infinity, that is the motor coil burned or a gear of the coil is broken.
4, the last point, measure the next five lines and motor shell, which is also known as \ “ground \” there is no short circuit.
Second, how to use a multimeter to detect the electric fan motor good or bad?
The five lines are three speed motor, it is difficult to test, five lines two pairs were measured, first of all, to ensure that they are access, and five lines are not short-circuited to the ground, to find the maximum resistance of the two, the two are starting and running, and then between the two connected to a capacitor, and then from the two lines inside any one and the remaining three inside any one, power on, look at the steering, if the steering is right, then prove that the connected Capacitor at the same time connected to the electricity of the one is running, the steering is not right, is another is running. At this point already know which one is starting and running, the remaining three are the common end, respectively, corresponding to different gears, then power on to try it.
Theoretically speaking, the resistance between the common terminal and the running plus the resistance between the common terminal and the starting is equal to the resistance between the starting and running. The running and common terminal resistance is greater than the starting and common terminal resistance.
C. Introduction of motor fan
Although the motor fan has high reliability, it is still a mechanical device and its speed may drop or even stop when used for a long time, so it is better to monitor the operation status of the fan in real time to facilitate timely detection of problems. The use of an alarm sensor can give an alarm signal when the fan speed is below a certain threshold value, while the speed signal output enables real-time monitoring of the fan speed. The alarm signal output from the fan circuit has two states, “high” and “low”, and the meaning represented by the two levels is generally in accordance with the positive logic system, high level means “fault” and “low” means “fault”. and “low” means “normal”. The speed signal from the fan circuit is usually in the form of pulses, with each wavehead indicating one revolution of the fan, and such a signal can be provided directly to the host computer for display via the data bus. Some fan output speed signals are not the true speed of the fan, but rather a multiple of the speed, such as 2, 4 or 6 pulses per revolution, which must be processed to form the true speed signal of the fan. To determine if the fan speed is the real speed or a multiple of the real speed, the actual speed can be measured with a tachometer and then compared to the displayed data. The fan speed signal is usually output from a three-lead plug, with the yellow and black leads being +12V power and ground respectively, and the other color wire being the speed signal output. It should be noted that the third lead of some three-lead fans is not the speed signal output line, but the speed control signal line, through which the speed control signal is input to the fan motor.
The method of measuring the electric fan motor is relatively simple, and does not require us to master too much professional background knowledge, as long as we refer to the above method steps and detailed operation, I believe that we can successfully detect. In addition, we have also analyzed and introduced the content of the motor fan above. As a special fan with excellent reliability, the motor fan is suitable for certain scenarios with special requirements.
