3 phase slip ring induction motors for industrial requirements

MENZEL three-phase motors with slip ring rotor motor in the MEBSGR series have a torsion-resistant gray cast iron housing with cast feet (optionally with welded cast iron housing). The housing design ensures optimal cooling and also means a high level of self-cleaning. The terminal boxes can be rotated by 4 x 90°. The PTC (cold-conductor thermometer probe with positive temperature coefficients) can be found in the terminal box on the commutator side.

The MEBSGR series can be delivered in the IM B3 construction type as standard. Special designs such as, e.g., IM B35 are possible at all times on request. As is the case with all our three-phase motors, the MEBSGR is also produced pursuant to European Standards EN 60034 and IE 60034.

The slip ring rotor chamber of the IC 411 slip ring induction motor is separated by what is known as a labyrinth seal, which prevents contamination from coal dust. The slip ring rotor chamber has two modification openings. This means that the state of the carbon brushes and the slip ring rotor can be monitored, and cleaning can take place.

MENZEL three-phase motors with slip ring rotor can be delivered with permanent contact brushes. The slip rings can be found in an area mounted on the B-side, separated from the winding. This arrangement enables simple access and ease of maintenance. Coal dust is therefore kept away from the winding.

MEBSGR motors are generally designed with temperature monitoring for the stator winding. PTCs (cold-conductor thermometer probe with positive temperature coefficients) are installed in the stator winding. Their connections are found in the terminal box on the commutator side. A wide range of additional sensors and transmitters are available on request at any time.

All MENZEL three-phase induction motors undergo a thorough factory test in our on-site test area. A relevant test report is prepared for each motor and added to the documentation before delivery, if desired.

MENZEL 3-phase slip ring induction motors in protection class IP 55 are designed in the IC 411 cooling class. Higher protection classes can be realized on request at any time.

The generally humidity-protected motor winding is designed to be in thermal class "F" and is impregnated using the VPI process. In this case, VPI stands for "Vacuum Pressure Impregnation". The heating during rated operation is a maximum of 80 K, which results in creation of a reserve capacity and the motors do not age as quickly. The winding is capable of withstanding the highest mechanical stresses. Restarting against a residual field of 100% following a power failure is possible at any time.

At MENZEL only high-quality branded roller bearings and lubricants are used. The motors in the MENZEL MEBSGR series are designed with lubricated roller bearings incl. lubrication devices.

For a belt drive, roller bearings for the driving end (reinforced roller bearings) are available for all sizes on request, in order to be able to safely absorb the typically-occurring larger radial forces. Custom solutions that deviate from this can be implemented for you on request at any time.

Lithium-saponified grease is used as lubricant. Lubrication must only take place with other brand-name lithium-saponified greases. If you have any questions please do not hesitate to contact our team of engineers.

MEBSGR motors in the IC 411 cooling class already fulfill the basic requirements of vibration level A (normal). Vibration measurement is carried out in no-load operation, at the nominal voltage and nominal frequency. The balance quality of the motors is essentially “half-key”.

Due to its optimized design, the standard version guarantees low noise levels. Sound pressure levels in network operation (IEC tolerance: + 3 dB (A)) are stated in the data sheets. Noise measurement is carried out in no-load operation, at the nominal voltage and nominal frequency.

The power rating specifications for the MENZEL MEBSGR series apply to long-term operation at nominal voltage and nominal frequency (operating mode S1), with an ambient temperature of 40°C and an installation altitude of 1,000 m above sea level. A reduction in the power rating must be taken into consideration in accordance with potential deviations from this installation altitude. Our slip ring induction motors in the 411 cooling class can be overloaded once per hour with 1.5 times the nominal voltage for up to two minutes.

MENZEL three-phase motors with slip ring rotor are typically designed for operation in ambient temperatures between -20°C and +40°C. A power reduction is required for higher ambient temperatures.

The motors are painted in RAL 1016 (sulfur yellow) as standard. The paintwork is suitable for the "moderate" climate group pursuant to IEC publication 721-2-1 for internal or outdoor installation.