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14/06/2004
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Film projectors, designed and manufactured by Kinoton, are using geared motors and smd frequency inverters from Lenze
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The German firm, which won an Oscar for Scientific and Engineering Achievement from the Academy of Motion Picture Arts & Sciences, has developed and patented a range of film projectors that are capable of running up to 100 frames per second and are suitable for cinemas, processing laboratories and film archives.
According to Lenze, Kinoton chose the smd inverter because of its "low cost and ease of set up," and because "the compact dimensions of the smd meant that it could be mounted right alongside the electric motor."
The unique EPM memory chip stores the entire inverter configuration along with motor parameters and plugs into the front of the smd. Copying the settings is easily done in a battery powered programmer (taking less than three seconds) and the new EPM chip can transfer those settings to a new inverter even without the need to power it up. DP
Pointers
* The inverters are rated at 0.25 or .037kW and are suitable for sensitive mechanisms such as film projectors drives with soft acceleration
* Overload protection for the motor is integrated with microprocessor calculation of the motor load level independent of output torque and so extra protection hardware is unnecessary
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Author
Tom Shelley
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