Modern control systems such as variable frequency drives (VFDs) impose electrical stresses different from traditional direct-on-line starts. When rewinding motors that will run on VFDs, specialists must consider insulation class and winding distribution.
VFDs can generate higher dv/dt voltage spikes and common-mode currents, so selecting appropriate varnishes, insulation materials and surge protection during a rewind is critical for long-term reliability.
After any rewind performed on a motor destined for VFD use, run shelf and functional testing with representative drive equipment. This uncovers overheating, resonance or bearing current issues early.
Discuss your control system and expected duty cycle with the rewind shop. For tailored rewinds that match drive requirements, contact Rotating Electrics for recommendations and VFD-compatible rewinds.