CE Certified Medium Voltage Electric Motors Supplier & Suppliers

Under IEC 60034 standards and international electrical classification, electric motors operating at rated voltages between 1,000V (1kV) and 15,000V (15kV) are classified as Medium Voltage (MV) motors. Standard operational voltage levels in industrial processing plants include 3.3kV, 6kV, 6.6kV, 10kV, 11kV, and 13.8kV. CE certification verifies that these high-capacity machines fulfill rigorous European safety, electrical insulation, and electromagnetic compatibility directives.

High-voltage electrical stress creates electrical corona effects and partial discharge within trapped micro-cavities. VPI processing submerges the complete pre-wound stator in synthetic epoxy resin under high vacuum, forcing air out of the insulation layers, followed by positive hydraulic pressure to drive resin deep into every strand gap. This produces a void-free, mechanically rigid, moisture-proof, and thermally superior insulation barrier rated for Class F or H endurance.

Slip Ring (wound rotor) medium-voltage motors (such as the YRKK series) are specifically chosen for applications requiring exceptionally high starting torque with low starting current, or where weak utility power grids cannot support massive direct-on-line (DOL) inrush currents. By inserting external liquid resistance starters (LRS) into the rotor circuit during startup, heavy machinery like ball mills, SAG mills, and large crushers can start under full load without causing severe voltage dips on the local power grid.

VFD drive switching generates high-frequency common-mode voltages that induce capacitive voltage across the motor shaft, leading to electrical discharge machining (EDM) fluting across bearing raceways. To safeguard motor lifespan, MV motors driven by VFDs are equipped with insulated non-drive-end (NDE) bearing housings, hybrid ceramic bearings, and grounding brushes to safely divert residual shaft currents away from critical rolling elements.

Yes. Menzel specializes in reverse engineering and custom manufacturing replacement motors to mirror the exact mechanical footprint, shaft height (H-dimension), flange configuration, terminal box positions, and electrical characteristics of vintage machines manufactured decades ago. This allows industrial operators to drop in a modern, highly efficient CE-certified motor without costly plant shutdown delays or modification of civil concrete foundations.

Every motor leaving the manufacturing plant undergoes rigorous routine testing according to IEC 60034-1, including winding resistance measurements, insulation resistance tests (PI/IR), high-voltage dielectric tests, no-load loss calculation, vibration severity measurement, and shaft voltage verification. Complete type test reports, VPI log sheets, balance certificates, and CE declaration of conformity documentation are provided with every delivery.