How to detect the quality of the motor? How to judge whether a motor is good or bad?

You're definitely talking about AC motors, because DC motors are two wires. Solution: (Remember that I have been doing electrical maintenance in the factory for 20 years, and this is how I taught my disciples!) ）

1. Shake the meter, 500V can shake the meter, and shake the insulation resistance of the wire on the three binding posts to the motor shell, which should be above Europe, indicating that there is no short circuit to the ground.

2. Multimeter measurement: measure the resistance between the three phases of ab c, whether it is equal, it should be about the same, and the difference is too much, but it will not take long, remember that the larger the motor, the smaller the resistance! But you can't all three phases be 0 ohms, unless you are particularly large, such as a motor above 50kw!

Remember, if it is a speed regulating motor, the resistance value of the 6 terminals is not the same!

3. Check the bearings and fans, and generally wrap the motor to let them all be replaced! Because sometimes the bearing will burn the motor!

4. The no-load current of the motor is generally 10 50 of the rated current, and sometimes the idling current of the motor is zero!

5. When the rated current of the motor is running, it is running at full load, and the output power is basically 100. The running current is small, which means that the output power of the motor becomes smaller, and it is a light load operation.

6. If there is no three-phase electricity, find a starting capacitor of a washing machine, and connect it to 220V.

Remember: the moon and the autumn river.

Hello, the most common detection method is to use a multimeter to measure.

How to detect the quality of the motor with various tools.

Measurement method of motor quality:1. Check whether the insulation resistance of the motor coil is greater than the megaohm, if it is greater than the megaohm, it means that the insulation performance of the motor is good;

2. Use the multimeter resistance file to test whether the DC resistance of the 3 windings of the motor is the same, if it is the same or the size deviation of the DC resistance of the 3 windings is very small, it means that there is no inter-turn short circuit between the coils of the 3 windings;

3. Manually rotate the shaft of the motor, and check whether there is any disc immobility, abnormal noise, etc.

4. Check the quality of the motor, check whether the insulation resistance of the motor coil is greater than the megaohm with the insulation resistance shake table, if it is greater than the megaohm, it means that the insulation performance of the motor is good.

Step 1: Use a shake meter to measure the insulation of the motor to the ground. It should be noted that for 380V motors, 500V shake gauge should be used, such as 1000V or 2500V shake gauge shake test may break down the motor insulation.

Shake the meter flat, shake the rocker at a speed of 120 revolutions per minute, and insulate the binding post of the shaker and the motor shell to not less than megaohms. Of course, the higher the insulation value, the better, and in actual work, it is generally tens of megabytes, hundreds of megabytes or even infinity. If the insulation to the ground is too low, it is necessary to consider the maintenance of the motor.

For wound motors, the insulation between the shaker and the rotor, and between the rotor and the ground should be qualified. For the shaking test of high-voltage motors, 2500V shake meters are generally used, and the insulation value should not be less than 1m kV, such as 10kV motors, and the insulation value to the ground should not be less than 10 trillion ohms.

Step 2: Use a multimeter to measure whether the three-phase resistance value is balanced. If the motor connecting piece is not removed, the star connection motor can measure the resistance between each phase and the star point, and the three-phase resistance value should be basically equal.

The angular connection motor can be measured in three phases and two by two, and the resistance value should be basically equal. If the three-phase resistance of the measured motor is severely unbalanced, there is a possibility of an inter-turn short circuit.

Step 3: Also check the mechanical parts of the motor. For example, the quality of the bearing, whether the motor is swept or not. In the case of no load of the motor, it can be manually rotated to observe whether the motor rotates lightly and whether there is any abnormal noise.

If there is no abnormality in the above checks, you can power on the motor for experiment.

Want to find a motor manufacturer but don't know which one to find? It is better to choose Hebei Youanjie Technology, the company has strong strength, developed technical force, has a professional R & D team and engineering and technical team, and strictly controls the quality. [Click here for more product information].

The method of judging whether the single-phase or three-phase motor is burned out with a multimeter is only applicable to small motors with DC resistance of coil windings above 1 ohm, and the method of judging whether a three-phase motor is burned out is relatively simple, and the DC resistance resistance of the three-phase winding is balanced with a multimeter, and if it is not balanced, you can judge that the three-phase motor is burned out.

Second, the DC resistance of the starting winding of the single-phase motor is generally greater than that of the running winding, and the simplest way to distinguish it is; 1.First, use a multimeter to measure the DC resistance from the common end to the running winding end and the starting winding end.

2.Then use a multimeter to measure the DC resistance from the running winding end to the starting winding end.

3.If the arithmetic sum of the two measurements in "1" is not equal to the measurements in "2", then the motor must have burned out!

If it is equal, it is best to compare it with the same model motor, or find the factory parameters of the motor for comparison. to judge the quality of the motor.

To add that, the capacitance should be disconnected when measuring a single-phase motor. Single-phase motor short circuit is that you have to have a normal resistance value as a reference. It's good to use the two methods of smelling and seeing.

Hello, you can check it like this, 1. Check whether the insulation resistance of the motor coil is greater than the megaohm with the insulation resistance shake table, if it is greater than the megaohm, it means that the insulation performance of the motor is good; 2. Use the multimeter resistance file to test whether the DC resistance of the three windings of the motor is the same, which means that there is no inter-turn short circuit between the coils of the three windings.

Measurement method of motor quality: 1. Check whether the insulation resistance of the motor coil is greater than the megaohm with the insulation resistance shake table, if it is greater than the megaohm, it means that the insulation performance of the motor is good; 2. Use the multimeter resistance file to test whether the DC resistance of the 3 windings of the motor is the same, if it is the same or the size deviation of the DC resistance of the 3 windings is very small, it means that there is no inter-turn short circuit between the coils of the 3 windings; 3. Manually rotate the shaft of the motor, and check whether there is any disc immobility, abnormal noise, etc.

Check the quality of the motor: 1) Check whether the insulation resistance of the motor coil is greater than the megaohm with the insulation resistance shake table, if it is greater than the megaohm, it means that the insulation performance of the motor is good; 2. Use the multimeter resistance file to test whether the DC resistance of the 3 windings of the motor is the same, if it is the same or the size deviation of the DC resistance of the 3 windings is very small, it means that there is no inter-turn short circuit between the coils of the 3 windings;

Questions. <>

How to test with a multimeter.

Use the multimeter resistance file to test whether the DC resistance of the 3 windings of the motor is the same, if the same or the size of the DC resistance of the 3 windings is very small, it means that there is no inter-turn short circuit between the coils of the 3 windings.

Questions. <>

Which one. K is the ohm file.

Use the multimeter resistance file to test whether the DC resistance of the 3 windings of the motor is the same, if the same or the size of the DC resistance of the 3 windings is very small, it means that there is no inter-turn short circuit between the coils of the 3 windings.

Questions. <>

Which test is used. It's okay, use a large number of ranges first.

Of course, there is no rule, but their resistance can be measured, and if there is no resistance, the coil is broken

The electric fan motor is a single-phase motor, and there are two sets of coils in the motor, one is the main limb coil, and the other is the secondary coil. The circuit diagram is as follows:

The method of measuring the quality of the motor with a multimeter (preferably a pointer multimeter is more straightforward) is as follows:

1. Dial the meter to the measurement resistance RX100 gear.

If the resistance value is almost the same, it is good. If the resistance value is very different, it is bad. In addition, the motor lead wire is connected with the shell, indicating that the motor is leaking, and it cannot be used, which is bad.