Motor Trouble-Shooting (7)

Problem:
Motor vibrates.

Like Causes:
1. Motor misaligned to load.
2. Load out of balance (Direct drive application.)
3. Motor bearings defective.
4. Rotor out of balance.
5. Motor may have too much endplay.
6. Winding may be defective.

What To Do:
1. Realign load.
2. Remove motor from load and inspect motor by itself. Verify that motor shaft is not bent. Rule of thumb is .001″ runout per every inch of shaft length.
3. Test motor by itself. If bearings are bad, you will hear noise or feel roughness. Replace bearings. Add oil if a sleeve of bearing. Add grease if bearings have grease fittings.
4. Inspect motor by itself with no load attached. If it feels rough and vibrates but the bearings are good, it may be that the rotor was improperly balanced at the factory. Rotor must be replaced or rebalanced.
5. With the motor disconnected from power turned shaft. It should move but with some resistance. If the shaft moves in and out too freely, this may indicate a preload problem and the bearings may need additional shimming.
6. Test winding for shorted or open circuits. The amps may also be high. Replace motor or have stator rewound.

Advertisements

Leave a Reply

Fill in your details below or click an icon to log in:

WordPress.com Logo

You are commenting using your WordPress.com account. Log Out /  Change )

Google+ photo

You are commenting using your Google+ account. Log Out /  Change )

Twitter picture

You are commenting using your Twitter account. Log Out /  Change )

Facebook photo

You are commenting using your Facebook account. Log Out /  Change )

Connecting to %s


%d bloggers like this: