OME Motors – Permanent Magnet Synchronous Motor (OMPM)

The OME Motors OMPM permanent magnet motor is a synchronous motor (PMSM) for variable-speed drives. Power 0.75–2500 kW, frame sizes 80–400, efficiency above the IE4 threshold.

The series is designed for variable-speed drives: pumps, fans, compressors, conveyors. Two versions are available — VFD-fed and direct-on-line (Line-Start).

OMPM permanent magnet motor: technical specifications

How does a permanent magnet motor differ from an induction motor?

Permanent magnets are embedded in the OMPM rotor, so the rotor flux is produced without magnetising current. There are no rotor winding losses, which limit the efficiency of an induction motor.

Compared with a NEMA Premium induction motor of the same power:

• Efficiency is 2–5 points higher across the whole load curve. The largest difference is at partial load.
• Torque at low speed. OMPM delivers rated torque from almost zero speed without forced cooling. A VFD-fed induction motor loses available torque below 30 % of base speed.
• Dimensions. The OMPM housing is typically one or two IEC frame sizes smaller.
• Start-up. Standard OMPM motors start from a frequency converter. For direct-on-line starting there is the Line-Start version.

For drives running at constant speed, the induction motor of the series is suitable: Standard.

IPM or SPM: which rotor design to choose?

In the IPM design, the magnets are located inside the rotor lamination stack. A reluctance torque component is added, which extends the constant-torque speed range and improves operation in the field-weakening region.

Design SPM has a simpler magnetic circuit. It suits lower-speed drives.

Where are OMPM motors used?

• pumping systems — water supply, wastewater, irrigation;
• ventilation and air conditioning — air handling units, chillers;
• compressors with variable load — centrifugal and screw;
• food production — conveyors, mixers and variable-speed pumps;
• power plant auxiliaries — boiler feed pumps, cooling water pumps, fans.

Motors are supplied separately or together with food-grade pumps and industrial pumps.

Selection and supply by Steiner Ukraine

Selection requires:

• load profile — how many hours the motor runs at partial load;
• speed range and required torque;
• supply voltage;
• existing frequency converter — its model and whether it supports permanent magnet synchronous motor control;
• mounting arrangement.

The price depends on the version and quantity. We prepare a quotation on request. The general selection method is on the page OME Motors.

FAQ about the OMPM permanent magnet motor