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Lenze’s MF inverter optimised motors are designed to bridge the gap between standard AC motor technology and servo motors where output speeds from 60 to 500rpm are required.

The company has achieved the twin goals of higher efficiency and lower purchase costs by taking standard four-pole motor designs and optimising them for use at 120Hz – equivalent to a speed of about 3,500rpm.

Special shaft seals are fitted for running at the higher speeds and high-temperature grease is used in the bearings.

In most cases the high output speed is not directly usable and motors are generally supplied with a gearbox.

Lenze has a full range of in-line helical and right-angle bevel, helical bevel and helical worm gearboxes.

There is a slight decrease in gearbox efficiency at these higher input speeds, but this is more than compensated by the motor gains.

The efficiency of these 120Hz optimised MF motors increases by typically five or six per cent compared with a standard four-pole motor.

For example, at 0.75kW, the efficiency is practically 80 per cent and close to the IE3 efficiency level that becomes compulsory in 2015.

The higher speed increases the rated power delivered by the motor.

This in turn allows the size of the motor to be reduced by one or two frame sizes, leading to lower purchase costs, lower inertia and more dynamic drives.

The performance takes a step towards servo levels with high acceleration and deceleration.

Full torque is available over a 1:24 speed range.

Currently, the MF motor is available from Lenze freestanding or as a geared motor for use with the new 8400 motec inverter, which can be terminal box or wall mounted.

This autumn, the power range will extend to 22kW and use will also be possible with all cabinet-mounted inverters of the Lenze 8400 range.

A full range of options can be added to MF motors, including spring-applied brakes for stopping and holding, incremental encoders, blowers to extend the operating range and plug connectors.

With 40 years' experience, Lenze Ltd are specialists in drive and automation equipment for the UK market. Today Lenze employ 60 people and operate with management systems approved to ISO 9001:2008.

Experience and expertise

The engineering comes first. With almost 50 per cent of our staff being qualified engineers, the right-sized technical solution to your problem is our goal. Our vision of right sizing means to work with you in order to achieve the optimum solution in terms of cost and performance.

The complete drive system  

Our products fit together to make the complete drive and automation system. Lenze products include automation, controllers, servos, inverters and geared motors. Our Techdrives division adds essential drive components such as couplings, actuators and locking bushes to complete your design.  

Worldwide, we are there to help you

Lenze companies are in 29 countries and have sales offices in a further 24. Full product information is available on our website and the international helpline makes it easy to contact us.

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