How to check if the motor of an electric pallet tilter is operating normally?

2025-09-03 11:58:00

To check whether the motor of the electric tray flipping machine is running normally, it is necessary to gradually advance from four dimensions: "appearance inspection, operation status monitoring, electrical parameter detection, and abnormal fault investigation", covering the mechanical structure, operation performance, and electrical performance of the motor, to ensure comprehensive identification of potential problems (such as bearing wear, winding short circuit, overload operation, etc.).

Preparation in advance: Ensure safety and complete tools

Safety prerequisite

Disconnect the motor power supply to avoid electric shock caused by live operation; If the motor has just stopped, wait for 15-20 minutes for it to cool down to prevent high-temperature burns.

Tool Preparation

Basic tools: flashlight, dry cloth, wrench;

Professional tools: multimeter, clamp ammeter, bearing stethoscope, infrared thermometer.

Step 1: Static Appearance Inspection

First, visually observe the exterior and connection parts of the motor to eliminate any visible faults.

Step 2: Dynamic operation status monitoring

Connect the power supply and let the motor run for 3-5 minutes under no-load or light load conditions. Use "listen, look, touch, and test" to determine if the operation is normal:

1. Listen: Identify abnormal noises

Listen to the sound with a bearing stethoscope. A normal motor should only have a "uniform buzzing sound" without any noise;

Abnormal sound and corresponding malfunction:

Rustling sound "or" friction sound ": bearings lack oil or wear;

'Sharp and piercing sound': Loose inner/outer ring of the bearing, or friction between the fan and the casing;

'Dull buzzing sound+vibration': Short circuit between turns of motor winding, or rotor eccentricity.

2. Observe: Observe the stability of operation

Observe whether the motor fan rotates smoothly without any "shaking" or "jamming"; If the fan rotates irregularly, it may be due to a bent rotor shaft or a misaligned fan installation;

If the motor is driven by a belt, it is necessary to check whether the belt is slipping. Normally, there should be no slipping and the belt tension should be moderate.

3. Touch: Check the temperature rise of the motor

Gently touch the motor casing with the back of your hand and run for 5 minutes

Normal temperature rise: shell temperature ≤ 60 ℃;

Abnormal temperature rise: If the temperature exceeds 70 ℃, it may be caused by overload, winding short circuit, or bearing jamming leading to frictional heating.

Special attention: If the motor is equipped with a "thermal overload protector", excessive temperature rise will trigger automatic shutdown. At this time, the fault needs to be checked before restarting, and power on cannot be forced.

4. Measurement: Electrical parameters

Operating current detection: Use a clamp ammeter to clamp the motor power cord, and during no-load operation, the current should be ≤ 30% of the rated current; If the no-load current approaches the rated value, it may be due to winding short circuit or rotor stalling;

Voltage detection: Use a multimeter to measure the input voltage of the motor, which should be consistent with the rated voltage of the motor; High voltage can burn out the winding, while low voltage can cause a decrease in speed and an increase in current.

Step 3: Special inspection of core components

If any abnormalities are found during the appearance/operation inspection, further disassembly or testing of the core components is required to locate the specific fault:

1. Bearing inspection

After the power is cut off, rotate the motor shaft by hand, and it should rotate flexibly without any "jamming" or "axial movement";

If there is high rotational resistance or abnormal noise, remove the bearing end cover and check the bearing:

Are there any pockmarks or cracks on the inner/outer ring of the bearing;

Pinch the bearing ball by hand and feel if there is any "clearance". If the ball is severely worn, it should be replaced immediately and high-temperature lubricating grease should be added.

2. Winding insulation inspection

Use a multimeter in the "resistance range (× 1000 Ω)" to test the insulation of the winding:

Test the "winding to ground insulation": one probe is connected to the motor housing, and the other is connected to the motor winding terminal. The normal resistance should be ≥ 5M Ω;

Testing the insulation between windings: Measure the resistance between U-V, V-W, and W-U separately, and the normal three-phase resistance values should be basically the same; If the resistance of two phases is 0 or much lower than that of other phases, it indicates a short circuit between turns in the winding.

3. Rotor inspection

If there is a "sweeping sound" during the operation of the motor, the motor end cover should be removed and the rotor iron core should be observed for any signs of wear;

Measure the roundness of the rotor shaft with a micrometer. The radial runout of a normal shaft should be ≤ 0.05mm. If the shaft is bent, it needs to be corrected or replaced, otherwise it will continue to rub against the stator and burn out the winding.

summary

The motor is the "power core" of the electric tray flipping machine, and inspection should follow the logic of "static first, dynamic second; appearance first, internal second; intuitive first, instrument second" - first eliminate simple problems such as wiring and casing, then identify hidden faults through operating status, and finally conduct in-depth investigations on core components such as bearings and windings. It is recommended to conduct daily inspections once a week and once a month to effectively prevent sudden motor failures and extend the service life.