Three-phase electric motors

SEVA-tec GmbH specializes in addressing complex challenges in professional drive technology, focusing on electric motors, frequency converters, and geared motors. On this page, you will find a selection of cast iron electric motors in frame sizes 160, 180, 200, 225, 250, 280, 315, 355, and 400, with power ratings of 4 kW, 5.5 kW, 7.5 kW, 11 kW, 15 kW, 18.5 kW, 22 kW, 30 kW, 37 kW, 55 kW, 75 kW, 90 kW, 110 kW, 160 kW, 200 kW, 250 kW, and 315 kW. These drives are available in various speeds and configurations, including 2-, 4-, 6-, and 8-pole versions. They are, of course, available as energy-saving motors in IE1, IE2, IE3, IE4, and IE5. These three-phase electric motors are also frequently required as custom motors with customer-specific requirements. Here, we are the ideal partner for you, because our expert staff, combined with an extensive warehouse of gearboxes and motors and our own final assembly, allows us to cover a wide range of needs. Whether you require a special brake motor, circular saw motor, electric motor with frequency converter, pole-changing motor, special shaft, special voltage, or three-phase motor in various protection classes – we are your competent contact!

IE5 electric motor, type B3/B5

Electric motors – Protection classes

All motors and junction boxes are rated IP 55 according to DIN EN 60034-5. The three-phase motors are suitable for installation in dusty and humid environments, in accordance with the standard. When installed outdoors, the motors must be protected from direct sunlight. Electric motors with upward-facing shaft ends must be protected by the user from water ingress along the shaft. For special applications, the IP rating of the motors can be increased upon request through additional measures.

Standstill heaters

In three-phase motors exposed to strong temperature fluctuations or extreme climatic conditions, the motor winding is at risk of condensation or dew formation. As an option, a built-in standby heater can warm the motor winding after it is switched off, preventing moisture from condensing inside the motor. The standby heater should not be switched on during operation.

Runner balancing

All motors have rotors dynamically balanced with a half key inserted according to DIN ISO 8821. Drive components such as pulleys, couplings, and pump impellers must also be dynamically balanced with a half key inserted. It is essential to ensure that the hub length and the keyway length match to prevent any additional residual imbalance. Full keyway balancing is available upon request.

Mechanical smoothness

Due to balancing and concentricity tolerances, the vibration behavior of the motors corresponds to vibration category A according to DIN EN 60034-14. For special requirements regarding mechanical smoothness, motors can be supplied in a low-vibration version.