Motors and Drives
metering systems, instrumentation and inspection robots, and applications outside the medical field where high quality standards are necessary. The motors offer a maximum nominal speed of 80 000RPM, continuous torques of up to 0.95mNm and 70 percent efficiency (Fig. 4). They are available with or without Hall-effect sensors and with 6V, 12V and 24V windings. If required, the motors can be combined with the GP 8A planetary gearhead and there is a choice of two one-quadrant amplifiers: the DEC 24/1, which is directly connected via a flexible printed circuit board; and the DEC Module 24/2, which is a miniature plug-in module.
are therefore expected to be used in medical equipment such as handheld power tools. Compared with the 30W sterilisable motors that Maxon
Motor already offers, the new units deliver 50 percent more torque yet they are only 11 mm longer. EC 13 and EC size 5 motors are of identical design and possess identical characteristics; they both deliver torques of up to 8mNm with an efficiency of 90 per cent. The EC size 5 motors are 0.5 inch in diameter while the EC 13 models are 13mm in diameter; shaft diameters are 0.125 inch and 3mm, respectively. The motors are available sensorless or with Hall sensors and with three different winding options. Gearheads are available with reduction ratios of 5:1 to 125:1, with or without an output end shaft seal. The current generation of miniature motors and micro-
motors offers designers tremendous scope for miniaturisation and product enhancement, whether for the consumer market or niche markets such as medical equipment. Designers have to decide whether to use one of the many standard products or work with a supplier to develop a custom motor or gearmotor, but the costs are coming down, operating lifetimes are increasing and now is a good time to investigate the potential offered by these devices. l
Fig. 4. Maxon Motor’s new EC 8 series motors, which are just 8 mm in diameter, conform to the medical devices standard ISO 13485
Medical equipment often has to be sterilised, which is something that most electric motors cannot survive. However, Maxon Motor has recently launched EC 13 and EC size 5 motors that can be safely sterilised (Fig. 5). For medical applications requiring motor speeds of up to 90 000 RPM, the 50 W motors can be used as they are; alternatively, they can be equipped with inline gearheads to reduce the output speed. Maxon motor says the devices are characterised by high power, extremely low-noise and low-vibration operation, low heat generation and compact dimensions. These motors
Fig. 5. For applications where the motor must withstand sterilisation, Maxon Motor offers special EC 13 and EC size 5 motors.
Improving gear inspection O
ndrives Ltd has taken steps to ensure its gear inspection process is ever more reliable
and precise with the recent purchase of an INOVA Gear Inspection Machine, bought to measure all aspects of gear teeth using the newest CNC technology and which is accurate to Class 1.
The new machine will be housed in a recently completed, climate controlled extension purposely built for precision gear assemblies and gear inspection in a clean, stable environment.
This high accuracy machine is capable 40
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of measuring gears from as small as 5mm diameter. It can measure all different types of gears including spurs, helicals, bevels and worm wheels. This type of measurement system allows for useful feedback on gear
cutting methods used to produce the gear as well as reporting on other aspects of gear measurement. This includes the pitch to pitch accuracy produced, cumulative pitch and radial runout to DIN 3964 along with the topography of a gear tooth and how well the gear form follows its intended shape depending on the accuracy class requested. l
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Ondrives Ltd is based in Chesterfield, Derbyshire, UK.
www.ondrives.com
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