Medium voltage motors

Medium voltage motors are used in all industries in which heavy loads are moved or work is carried out in conjunction with particularly complex applications. Since 1927 they have been part of our extensive range of reliable, high-efficiency industrial motors for cement plants, pump systems, mines, the chemical, oil and gas industry, plant manufacturers and other users worldwide.

Menzel manufactures medium to high voltage asynchronous motors up to 13800 V (13.8 kV) with squirrel-cage rotors up to 25000 kW (25 MW) as well as slip ring rotors up to 8000 kW (8 MW). Various electrical and mechanical designs as well as all types of protection and cooling are possible. Our motors are designed for mains or inverter operation and comply with the current standards EN60034 and IEC60034, VDE, DIN and ISO. 

MENZEL MV motors are designed for particularly tough and extreme industrial requirements. They are highly efficient, extremely robust, durable and easy to maintain

• Available as MV squirrel cage motors and MV slip ring motors
• All types of cooling and protection classes
• Customized special constructions for even the most onerous applications
• Identically interchangeable replicas of existing or obsolete motors
• Offer built in adaptability for existing foundations
• Production according to DIN ISO 9001
• High load capacity, high torque availablity and long service life
• High efficiency
• Low operating and maintenance costs, with high MTBF performance
• Also available for use in the most aggressive atmospheres

Custom design and special solutions are always possible at any time!

Menzel has supplied a specifically configured modular medium voltage motor for driving a compressor. The slipring motor from its MEBSSW range drives a reciprocating compressor operating in a dusty atmosphere at high ambient temperatures. In addition to implementing IP55 ingress protection and cooling type IC 81W (air-to-water heat exchanger), Menzel mounted two oil coolers directly on the MV motor housing for re-cooling of the sleeve bearings oil supply.

The 600-kW motor is intended to replaced an air-cooled motor featuring a lower protection class, IP23. Due to the new totally enclosed air circuit (CACW), there will be no more problems with small particle dust or dirt inside the motor, ensuring higher operational availability at ambient temperatures well over 40 °C. The new motor has an operating voltage of 3000 V and a rated speed of 491 rpm. It offers superior reliability, higher efficiency, low noise emissions along with lower operating and maintenance costs at a compact frame size and low weight.

Menzel has also configured this medium voltage motor to match the electrical and mechanical interfaces of the existing motor to ensuring a speedy installation without modifications on site. The customer is one of the leading Italian chemical companies producing a full range of industrial gases.

Just recently a Menzel MV motor rescued a cement plant in UK. The company was called on an urgent basis following the catastrophic failure of an 3300V kiln fan motor. With the existing failed motor design now obsolete and typical replacement from new in excess of 30 weeks, Menzel were approached to see if they could assist with their unique stocking policy by providing an alternative 2270 kW slip ring motor solution which would get the plant back up and running, as the current situation saw the plant completely shutdown with production losses mounting.

Menzel engineers assessed the information from the customer, checked stock levels and fortunately were able to offer to the client a similar sized MV motor with minimal site adjustments.

Whilst Menzel Berlin prepared the motor, the client and his local contractors made the subtle changes to the foundation to match up with the incoming Menzel motor. The replacement motor was delivered from Germany, arriving in the early hours of the morning seven days from order.  The motor was then fully run up to speed and brought to full load that very day.