Revealing Sealing

Brushless DC servo motors are an effective solution for applications in harsh environments.

A major factor for the selection of a DC motor in an application is the environment that it is intended for. maxon motor offer a wide range of IP rated brushless DC motors however factory IP ratings can some-times have undesired side effects. Take for example Figure 1: which is a 250w continuously rated 45mm brushless DC motor. This motor is assembled with a 52mm Ceramic Planetary Gearhead. The Gearbox is fitted with rubber sealed bearings and a rear cable exit housing for the encoder, motor and hall sensor cables that pass through rubber sealed grommets. This solution offers effective IP54 sealing for the of the DC motor but it is easy to see that the sealing method is quite bulky and possibly not suitable for many applications with tight mounting constraints. The good news is there are many other sealing solutions. maxon brushless DC inrunner motors do not require any airflow through the motor itself to maintain operating temperatures in the winding. Many unsophisticated brushed and brushless DC motors do however require convection cooling of either the windings or brushes. The inrunner design of maxon brushless DC motors combined with the ironless rhombic winding also allows the rotor to be thermally bonded to the housing and completely conduction cooled. Meaning the motor requires no airflow through it, allowing the motor to be inserted into a tube or extrusion housing to protect it from the elements. In many applications the size and cost of factory IP rated motors has resulted in the selection of smaller non IP rated motors with simple modifications like rubber or Teflon sealed bearings. Often the simple addition of an external v type seal on the shaft is sufficient. Figure 2: is an example of this style of modification. This brushless motor is only 30mm in diameter and with the addition of a Teflon seal and the motor being mounted in a tube housing gives a small, well cooled, sealed brushless motor at a fraction of the cost for factory IP solutions. This motor is used in an aerospace application where the weight of the motor is obviously critical and this solution offered a major advantage weighing only 270 grams. Additionally maxon also manufacture specialist motors for extreme applications. For example downhole drilling or deep sea remotely operated vehicles. In these applications the motors see extreme pressures whereby sealing is impossible and an alternate approach of letting the motor flood with oil is adopted.

Contact maxon motor in Sydney for further assistance. Ph: +61 2 9476 4777


Figure 1: which is a 250w continuously rated 45mm brushless DC motor

Revealing Ceilingpg

Figure 2: is an example of this style of modification



About maxon motor Australia

maxon motor is the world’s leading supplier of high-precision drive systems. More than 40 years’ experience, constant innovation, top-quality products and competent customer service make maxon motor a reliable partner in the drive technology sector. We are driven by your specific requirements. The product range incorporated in the modular system is comprehensive: Brushed and Brushless DC motors with the unique ironless maxon winding Flat motors with iron cores Planetary gears, spur gears and special gears Sensors (encoders, DC tachos, resolvers) Servo amplifiers, position controllers and control electronics High-tech CIM and MIM components Customer specific drive solutions. maxon motor is a Swiss company headquartered in Sachseln (Central Switzerland) that employs more than 2000 staff worldwide. With 14 sales companies based in over 30 countries, sales partners in another 10 countries and with six production sites, maxon motor are able to provide locally-based and competent customer service. maxon motor helps provide innovative solutions at competitive prices for numerous applications in various markets, such as Medical technology, Industrial automation and robotics, Aerospace industry, Automotive industry, Communication, Consumer applications, Inspection and Instrumentation and Safety engineering. maxon motor Australia is based in Mt Kuring-Gai NSW and our staff will be happy to help you with all your DC motor and technical enquiries.

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