Air motors

Selection of an air motor

Before selecting an air motor determine the working range parameters for the application, as necessary power, speed and torque. To ensure an economical use it is recommended to run it at its stated speed under load.

With more than 2500 different models we can offer many drive solutions. You chose your application - and our engineering department realizes the most cost saving solution. We accompany your project until the initial start up. This service convinces customers worldwide.

Air motor selection tool

Stalling resistant air motors

Stalling resistant air motors can be loaded up to their maximum torque. Whenever the maximum torque is reached the air motor will automatically stand still. This will not harm the air motor. If the air motor is repeatedly stopped by hard shocks high reaction torques may appear. These reaction forces can create damage in an ongoing use. We strongly recommend to consult us for further advice.

Air motors with brake

The air motor model MUB 23 is equipped with a force-fit holding brake. This break is controlled directly with the ingoing air pipe of the motor. No additional or external control pipe is needed. The maximum holding force of the holding brake is consistent to the starting moment.

The air motors MUB 300 , 400 und 600 are equipped with a spring tension loaded friction force brake. The brake is controlled by a seperate control pipe which must receive air before the air motor itself receives its air for working. The control line of the friction brake must receive a minimum of 4,8 bar pressure to open (control line without pressure = friction force brake tightened).

Air motors with low speed

Air motors with especially low revolutions are not resistant to stalling. To prevent severe damage these air motors may be loaded up to the stated maximum torque only.
To ensure that it is not overloaded with a higher torque we strongly recommend to integrate a safety clutch / torque limiter (see accessories).

Air motors with high torque

Types: MUB, MRD and MUD

Motors with high torque are standard-motors of the concerning type with an additional reduction gear what allows a high torque with low rotation speed. The air consumption is exactly as low as at standard-motors. The gears are robust, have a high constant driving torque and can be used until standstill (stalling moment).

Stainless steel air motors

Air motors made from stainless steel are preferably used in the food and chemical industry. The stainless steel air motors are resistant to aggressive detergents or corrosive air. The housing as well as all exterior parts are made of high quality stainless steel. The air motor has a built-in special sealing which protects the motor from penetrating dirt particles and water.

Non-lubricated air motors

The non-lubrication air motor models MRD 25 , MRD 38, MUD 16 and MUD 23 are engineered for non-lubricated use. When used with absolutely dry air without any oil mist it is possible that the free speed of the air motor drops down. A use with oil lubrication does not influence the functionality of the air motor. Moreover a lubricated use of the air motor increases the lifetime of the air motor significantly. In a shift or continuous operation it is highly recommended to use a non-lubrication model and to lubricate this air motor.

Oil traps for lubricated air motors

An air motor will reach a maximum lifetime when used with lubrication. Whenever an oil mist is permitted at the workingplace and the use of a long exhaust tube is not possible we recommend to mount an oil trap. The oil in the exhaust air is guided into and collected in the oil trap (the oil is filtered out up to 99 %). The exhaust air coming out of the oil trap is practically clean and without oil. Oil traps also can reduce the noise level with up to 30 dB(A) (depending on the mounting situation).

Noise reduction of air motors

The mechanical noise of a running air motor is very low. The expanding air is mainly responsible for the noise of a running air motor. To reduce the noise level dB(A) a silencer can be mounted to the exhaust air drilled hole of the models MRD, MRDZ, MUD and MUDZ. The noise reduction of the air motor models MR, MRZ, MU and MUZ is ensured by a sintered plate.
The noise level of the air motors (0,11 – 1,2 kW) is at an average of 77 dB(A). Depending on the requirements (e.g. in laboratories) we can reduce this value to 60 dB(A) by special solutions.

Speed throttle for air motors

Air motor models MRD and MUD

Whenever the torque given in the technical data is requested but the speed must be lowered we recommend to mount a speed throttle. The throttle is mounted to the exhaust air line. The speed throttle is a combined solution with noise reduction and a throttle valve.