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Controller drives brushless DC motors sans sensors

Posted: 29 Oct 2007 ?? ?Print Version ?Bookmark and Share

Keywords:speed controller? brushless DC motors? controlling algorithms?

DECS 50/5

The DECS 50/5 (Digital EC Controller Sensorless) is a new controller from Maxon designed for driving brushless DC motors without Hall sensors.

Typical sensorless drives such as pumps and fan applications can now easily be created thanks to modern technology and expert integrated controlling algorithms. Maxon's in-house developed speed controller is particularly impressive through its performance, price and size.

The wide input voltage range of 10-50V means that the DECS 50/5 is very flexible and adaptable. In continuous operation, an output current of 5A of the power stage is permissible, giving it a maximum output performance of 250Wall this with it only being the size of a business card. The speed value can be set via an integrated potentiometer or an analogue set value. The 1-Q amplifier can be operated at up to a maximum speed of 80,000rpm.

As a high performance, competitively priced and very small device, the new amplifier can be easily adapted to specific requirements. The free choice of starting sequence is a major benefit, as it allows the attached motor to start up easily, even when the motor data or load ratios are unfavorable. The DECS 50/5 also provides control inputs for selecting motor direction, enable and braking. The necessary protective functions have all been fully implemented. An operating status display (LED) and speed monitor output complete the convenient control features.

Plug-in screw terminals and a Flexprint connector for Maxon flat motors are available for the connection.

- Henri Arnold
EE Times Europe

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