A simple way to judge whether a motor is good or bad
Release time:
2023-06-03 00:00
If the detection of AC three-phase motor good or bad?
1, shaking table shaking, 500V shaking table can be, shaking the three terminals on the line to the motor shell insulation resistance, should be in 0.5M ohms above it means no short circuit to ground.
2, multimeter test: test A/B/C resistance between the three phases, whether equal, should be about the same, the difference is too much can also turn, but not for long, remember the larger the motor, the smaller the resistance! But not all three phases are 0 ohms, unless you are particularly large, such as 50KW above the motor. Remember that if it is a speed-controlled motor of 6 terminals resistance value is not the same.
3, check the bearings, fan, general wrap the motor so that all change, because sometimes the bearings hold dead will also burn the motor.
4, the no-load current of the motor is generally 10% to 50% of the rated current, sometimes the motor idling current is also zero.
5, the motor rated current running, is full load operation, the output power is basically 100%. Running current is small, indicating that the motor output power becomes smaller, is light load operation.
How to detect the good and bad of AC single-phase motor?
Use 500V megohm meter to measure the insulation resistance of motor winding and shell, it should not be less than 0.5 megohm. Use multimeter to measure the leads of winding, there is no broken line above all meet the requirements, the motor is good.
Detect the good and bad of the capacitor with a pointer multimeter is more convenient (there is also a digital meter with capacitance file, can be measured directly).
Dial the multimeter to 1K or 10K resistance file, test the 2 leads of the capacitor, the meter needle quickly to the right deflection after slowly back to the left side of the capacitor is good always to the right side of the capacitor is broken pointer is not moving the capacitor internal disconnection or no capacity. In this way you can only judge the goodness of the capacitor.
How good or bad is the DC motor?
First, see if there is a broken wire, test the resistance is normal.
If it is a brushed DC motor, you can let the rotor rotate and use a multimeter to measure the output DC power to see if it is normal.
If it is a brush DC motor, you can let the rotor rotate and use a multimeter to check if the DC output is normal.
If the motor is a brushless DC motor with three phases, the rotor can be rotated and the output alternating voltage can be measured with a multimeter.
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