3 phase squirrel cage induction motors

Users of MENZEL squirrel cage motors of cooling types IC 411 and IC 416 benefit from the low life-cycle costs of our electric motors, due to high product quality. In addition, our rib-cooled electric motors are characterized by their economical operation, simple maintenance and extremely long lifespan. The significance of cost-efficiency and profitability, the worldwide demand for standard three-phase motors with low, medium and high voltage were the most important reasons for the market launch of the MENZEL MEBKGR series.

The high level of efficiency is a result of the use of low-loss electrical sheets for the stator and rotor packages of our squirrel cage motors. In addition, we guarantee low-friction bearing set-up, and an optimal electrical design pursuant to the customer’s requirements. This results in enormous energy savings for users.

Just like all of our three-phase asynchronous motors, MENZEL surface-cooled squirrel cage motors are produced pursuant to the European Standards IEC 60034 and EN 60034, VDE, DIN and ISO in their current form.

The motors are available in construction types IM B3, IM B35, IM V1, or IM V15, pursuant to IEC 60034-7. We will also be happy to implement any special designs which deviate from this. The housing of our rib-cooled squirrel cage motors is made of robust, torsion-resistant gray cast iron. It guarantees optimal internal and external cooling, and outstanding self-cleaning.

The cooling fins are designed and arranged so that connecting elements can be attached to your installation in the perfect position, without interrupting the cooling circuit. Pursuant to the customer’s requirements, the motors are provided with a “top”, “right” or “left” terminal box. The terminal boxes can, in principle, be rotated by 4 x 90°. The size and number of cable leads can also be adjusted on request. Special terminal boxes (e.g. with phase separators, special dimensions, etc.) or single-phase plug-in systems are available on request.

MENZEL surface-cooled squirrel cage motors are primarily suitable for use in frequency inverters.

Our System solutions

MENZEL surface-cooled squirrel cage motors are designed pursuant to IEC 60034-5 in protection class IP55. Higher protection classes are available on request. The essentially humidity-protected motor winding is designed pursuant to IEC 60034-1, thermal class “F”, and is produced using the VPI (vacuum pressure impregnation) method. The thermal utilization of the motors takes place within thermal class “B”, which results in the creation of a reserve capacity, and ensures resistance to ageing. Optional insulation is available in Category H. The winding is capable of withstanding the highest mechanical stress, so that restarting against a residual field of 100% following a power failure is possible at any time.

Our standard MEBKGR motors are equipped with lubricated rolling bearings incl. lubrication devices and grease removal equipment. For belt drives, roller bearings for the driving end (reinforced roller bearings) are available on request, in order to be able to absorb the typically-occurring larger radial forces. Designs with self-lubricated or externally lubricated slide bearings are also available on request. At MENZEL, we only use high-quality bearings and lubricants which are made by renowned manufacturers.

MENZEL electric motors in cooling types IC 411 and IC 611 already fulfill the basic requirements of vibration level N (normal) in accordance with EN 60034-14. 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”. On request, the balance quality can be changed to “full-key”. In the standard design, all of our squirrel cage motors meet the requirements of vibration level A, but vibration level B is also available if required. The optimized design of the surface-cooled cage motor allows extremely low levels of noise emission. The vibration measurement is also carried out in no-load operation, at the nominal voltage and nominal frequency.

Standard painting in RAL 1016 or RAL 7030, in accordance with DIN 600 721-2-1 (climate group “moderate”), or special painting in all standard colors is indeed possible at any time, and is implemented individually in our on-site paint shop. MENZEL three-phase motors are typically designed for operation in ambient temperatures between -20°C and +40°C. For higher ambient temperatures of up to +60°C, a power reduction is required. We can calculate this for your individual requirements. For lower ambient temperatures from -30°C, MENZEL can supply special shaft steel and reinforced standstill heaters on request.

The power rating applies to operating mode S1 (long-term operation) at nominal voltage and nominal frequency, with an ambient temperature of 40°C and an installation altitude of 1,000 m above sea level. For different installation altitudes, a reduction of the power rating must be taken into account. At the nominal current, the motors can be overloaded with 1.5 times the nominal voltage for up to two minutes.

To protect the motor, the surface-cooled MENZEL MEBKGR series squirrel cage motors are essentially designed with temperature monitoring for winding and bearings, as well as mechanical SPM measurement taps for recording vibration values (Pt100 resistance thermometer (RTD) in the stator winding, Pt100 resistance thermometer (RTD) in the bearings, SPM measurement taps). The terminals of the resistance thermometers are implemented into a separate terminal box. A wide range of additional sensors and transmitters are available on request. In addition, our IC 411 and IC 416 motors are basically fitted with standstill heating (230 V/1~) incl. a separate terminal box.

On request and in the presence of our customers. Our skilled test area team will be happy to advise you on the different options.