Hot new autoclavable Brushless DC motors

EMS is able to supply motors that can survive the rigours of going through a medical autoclave at 135°C, 100% humidity, and a pressure of 2.1 bar.

For some years Electro Mechanical Systems has been supplying high performance Brushless DC servomotors.

Whilst these have found their way into many applications in industry and instrumentation, their use in the medical industry has been limited to devices for use away from sterile areas.

Now by virtue of the use of new plastic materials within the motor, and the adoption of new lubricants in the bearings EMS is able to supply motors that can survive the rigors of going through a medical autoclave at 135°C, 100% humidity, and a pressure of 2.1 bar.

Part of the autoclave cycle that can be withstood includes live steam on the motor for 3 minutes.

The motor range comes in 5 body sizes from 16 mm through to 35 mm.

The smallest motor is capable of delivering up to 10 watts of power at up to 30,000 rpm and 12 mNm.

The largest offer up to 101 watts at up to 12,200 rpm and 401 mNm.

As a direct result of the changes to enable these motors to survive the autoclave, their operating temperature range has also been extended to -30°C to +125°C .

the motor is not expected to be running whilst in the autoclave! These motors use the System Faulhaber winding technique, which in conjunction with a samarium cobalt magnetic gives class leading power to volume and weight.

This is particularly important in small hand held devices, allowing the power to be as close to the working point as possible, eliminating complex coupling arrangements and lowered efficiency.

These features also account for mechanical time constants as low as 10 msecs to ensure fast start stop operation.

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