Troubleshoot AC Motors – Part 2
This is a 4 part series, click to view each part: 1 : 2 : 3 : 4
Problem B – Motor runs noisy
B1: Are vibrations and noise from driven machine or power transmission system being transmitted to motor? | Locate source of noise and reduce. Isolate motor with belt drive or elastomeric coupling. | |
B2: Is a hollow motor foundation acting as a sounding board? | Redesign mounting. Coat foundation underside with sound dampening material. | |
B3: Check motor mounting. Is it loose? | Tighten. Be sure shaft is aligned. | |
B4: Is motor mounting even and shaft properly aligned? | Shim feet for even mounting and align shaft. | |
B5: Is fan hitting or rubbing on stationary part or is object caught in fan housing? | Repair damaged fan, end bell or part causing contact. Remove trash from fan housing. | |
B6: Is air gap nonuniform or rotor rubbing on stator? | Recenter rotor rubbing on worn bearings or relocate pedestal bearings. | |
B7: Listen to bearings. Are they noisy? | Lubricate bearings. If still noisy, replace. | |
B8: Is voltage between phases (three-phase motors) unbalanced? | Balance voltages. | |
B9: Is three-phase motor operating on one-phase? (Won’t start on single-phase.) | Restore power on three-phases. |
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