Shake the table. How to measure the value of the motor, what is the value,, I don t understand,, sol

Shake meters, also known as megohmmeters, are mainly used to measure the insulation resistance of electrical equipment. It is composed of alternator voltage doubling rectifier circuit, meter head and other components. When the meter is shaken, a DC voltage is generated.

When a certain voltage is added to the insulating material, an extremely weak current flows through the insulating material, which is composed of three parts, namely capacitive current, absorption current and leakage current. The ratio of the DC voltage to the leakage current generated by the shake meter is the insulation resistance, and the test of checking whether the insulating material is qualified with the shake meter is called the insulation resistance test, which can find whether the insulating material is damp, damaged and aged, so as to find the defects of the equipment.

There are several types of rated voltages such as V and measurement ranges such as m for megohmmeters.

The measurement of the insulation resistance of the motor is used for the longest time in the work.

Due to the relatively small resistance value of the stator and rotor windings of the motor, it is impossible to determine its insulation with an ordinary multimeter, so it is necessary to use a rocking meter with a larger voltage level.

The specific method is to use the shake meter to measure the insulation between phases and grounds, and before measuring, it is necessary to determine the correct cable joint for measurement, and verify that there is no electricity.

The black card of the shaker is connected to the motor shell, the red card is connected to the motor binding post, and the shaker is 120 rpm. Look at the index of the pointer, the unit is megaohm. If you shake the pointer at zero, don't shake it, continue to shake it will burn the watch, and the pointer is at zero, indicating that the motor has been hit with iron (leakage, and the motor can not be used).

The steps to test the motor by shaking the meter are as follows:

1. School schedule. Before measuring, the shake table should be tested for an open circuit and short circuit to check whether the shake watch is good. Open the two connecting wires, shake the handle, the pointer should point at the "" place, and then short the two connecting wires, the pointer should point at the "0" place, meet the above conditions that are good, otherwise it can not be used.

2. The equipment under test is disconnected from the line, and the large capacitance equipment must be discharged.

3. Choose a shake meter that meets the voltage level.

4. When measuring the insulation resistance, generally only the "L" and "E" terminals are used, but when the insulation resistance of the cable to the ground or the leakage current of the equipment under test is serious, the "G" terminal should be used, and the "G" end should be connected to the shielding layer or shell. After the line is connected, you can turn the shaker in the clockwise direction, the speed of shaking should be slow and fast, when the speed reaches about 120 revolutions per minute (ZC-25 type), keep the constant speed of rotation, read after 1 minute, and read while shaking, can not stop reading.

5. Dismantle and discharge. After the reading, the wires are removed while shaking slowly, and then the device under test is discharged. The discharge method is to take the ground wire used in the measurement from the shake meter and short it with the test device (not the shake meter discharge).

An electric motor is a device that converts electrical energy into mechanical energy. It uses an energized coil (that is, the stator winding) to generate a rotating magnetic field and acts on the rotor (such as a squirrel cage closed aluminum frame) to form a magnetoelectric dynamic rotational torque.

Use a clip to clamp any output line of the coil of the motor with a clip of the shake table, and put the other clip on the iron, and shake the watch at a constant speed to see the indicated resistance value.

The shaking meter is mainly used to detect the insulation of the motor to the ground and the insulation resistance between phases. Put the E and L ends of each card in one phase, and measure the insulation resistance at 120 revolutions per minute

First, first use a multimeter to measure the DC resistance of the three-phase winding, [in fact, the resistance value of the winding is very small, and our ordinary meter basically can't see the size, unless the motor is very small, just see if it works].

Second, if the three-phase windings are connected, then use one wire of the shake meter to connect the shell of the motor, and the other wire to measure whether the resistance value of the three-phase winding to the ground is normal, [the minimum resistance value shall not be less than the megaohm].

Third, if the three-phase winding to the ground resistance is normal, the last is to measure the insulation resistance between the phases, you will randomly connect one wire of the shake meter to the binding post of the one-phase winding, and the other one will be connected to the other two binding posts, [be careful not to connect two at the same time, to be connected separately] After the measurement, the swing line is adjusted to measure the windings of the other two phases respectively [the process of measuring the phase is only to measure the upper or lower 3 binding posts, and the resistance value shall not be less than the megaohm].

Clamp one of the two meter pens of the shake meter on the binding post of the junction box, and the other clip on the shell, and shake the handle of the shake meter evenly, and the reading obtained is the insulation resistance of the motor to the ground, which is generally qualified at about 200k 2m. The two pens of the shaker are clamped on the binding posts of different phases of the junction box, and the handle of the shaker is evenly shaken, and the reading obtained is the insulation resistance between the phases of the motor. Generally, it is qualified above 100k.

How to measure the quality of the motor by shaking the meter? The old electrician teaches you step by step, practical electrician technology!

Summary. Yes, to measure the insulation of the motor, it should be one end of the motor shell, the other end of the winding of the motor, through the shake test, the requirement is greater than the megaohm, infinity indicates that the motor insulation is very good, the measurement of phase resistance can not be measured with a shake meter, generally with the ohm file of the multimeter, with a range of 10 ohms or 100 ohms.

Yes, to measure the insulation of the motor, it should be one end of the motor shell, the other end of the motor around the knowledge of the local group, through the shake test, the requirements are greater than megaohms, infinity indicates that the motor insulation is very good, take back to let Shimin measure the interphase resistance can not be measured with a shake meter, generally with the ohm file of the multimeter, with a range of 10 ohms or 100 ohms.

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The first step is the open circuit test, in order to obtain accurate data to prevent the data error caused by the damage of the shake meter, the open circuit test we only need to separate the two watch hands and then shake the shake table, the position of the pointer indicates that the open circuit is normal.

The second step is the short circuit test, which is also a step to obtain accurate data, the short circuit test only needs to short the two meter pens and then shake the watch, and the pointer points to the 0 point position to indicate that the short circuit is normal.

The third step is to remove the motor connection guide, and novices need to remember the original connection method at the same time to prevent the wrong connection or cause the motor to reverse.

We only need to fix the E pole meter pen on the casing, and then test the UVW terminal on the L pole in turn, shake the motion meter at a speed of 120 revolutions per minute, and when the pointer is stable near infinity, it is well insulated, and below 5 trillion ohms, the insulation is poor or short circuit.

The motor interphase insulation test method only needs to measure the two meter pens on the UVW terminal in turn, between the two pairs, shake the meter at a speed of 120 revolutions per minute, and the pointer is stable near infinity when the insulation is good, here must be the same three sets of data to be considered normal, less than 5 trillion ohms below the insulation difference or short circuit.