Why load-side vibration exceeds motor limits — and how we address it transparently
In a recent inquiry for a high-voltage motor driving a vacuum pump via a rigid coupling, a professional customer raised a critical concern:
Could the pump’s high vibration damage the motor bearings?
After reviewing the customer’s data, our technical team confirmed the risk was real.
The load-side vibration was measured at 12 mm/s — well above our motor’s internal alarm value of 5.6 mm/s and shutdown threshold of 7.1 mm/s.
The proposed bearings (SKF 6230 C3 / 6228 C3) are robust and suitable for normal industrial conditions. However, continuous exposure to 12 mm/s vibration would lead to premature raceway fatigue, cage damage, and drastically reduced bearing life.
We did not hide behind marketing claims. Instead, we clearly communicated:
Our electric motor’s vibration acceptance criteria (2.3 / 5.6 / 7.1 mm/s)
The technical limitation of rolling bearings under excessive external vibration
A transparent conclusion: this is a mismatch between application condition and component capability, not a product defect
We also proposed practical solutions, including vibration-isolating couplings, bearing upgrades (C4 or NU series), and online monitoring with shutdown interlocks.
At Wolong, we believe professionalism means saying “no” when necessary — and offering real solutions for 3 phase asynchronous motor.
Post time: Apr-08-2026