Brake motors reduce operator injuries
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Lafert Electric Motors product story
Edited by the Engineeringtalk editorial team
Sep 10, 2002
A new generation of brake motors can form a practical solution to the requirements of the Provision and Use of Work Equipment Regulations 1998 and the associated woodworking Approved Code of Practice.
A major requirement of the Provision and Use of Work Equipment Regulations (PUWER) 1998 and the associated woodworking Approved Code of Practice (ACoP) is the need to reduce the rundown time of tool spindles by braking.
The application of the PUWER regulation is vital to safety as the woodworking industry has twice the accident rate of any other, and 6% of these accidents occur when the machine is on un-guarded rundown.
One approach being advised to the industry is to retrofit machinery with DC injection control systems, this solution does not, however, stop a machine under power failure conditions which due to the introduction of more "room emergency switches" can be quite common.
Also the DC injection method can increase the electrical and mechanical stresses on the windings of the old motor to such an extent that the HSE suggest that the motor will need to be rewound.
Another approach up until now largely dismissed due to overall length, shaft configurations and price, is the fitting of brake motors.
The introduction of the "AMS" range of brake motors from AEG goes a long way in overcoming these issues by being specifically designed for machine application.
AEG manufactures its own DC brake components which optimises the interface between motor and brake, thus ensuring the overall length to be little more than the standard motor.
Available in powers ratings 0.12-15kW and IEC frame sizes 63-132 with the "AMBX" range fulfilling the range above up to 200kW.
Braking torques vary from 3.4 to 40Nm which will bring the equipment to a safe stop in a relevant time without undue force.
To increase compatibility with existing mechanical mountings, AEG offers a multimount design which provides flexible positioning.
Also, from factory production over 20,000 configurations of flange and shaft dimensions are available on a global database.
Brian Bannister of AEG states: "With the HSE deadline in December 2003 for some machines, many of our customers have recently chosen the brake motor solution over others to meet the regulations".
He continues: "Not only has this been the best technical solution but we have shown savings of over 50% when compared with DC injection control.
This is just in initial outlay if you consider the cost of a rewind the difference can be staggering".
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