Shaft encoders with speed and position control

The new Sick Stegmann Sincos SRS 64 and SRM 64 shaft encoders with Hiperface interfaces for AC induction motors provide both speed and absolute position control in one cost effective unit.

The new Sick Stegmann Sincos SRS 64 and SRM 64 shaft encoders with Hiperface interfaces for AC induction motors provide both speed and absolute position control in one cost effective unit.

Until now, an incremental encoder was required to control the speed of the motor and a secondary absolute encoder was also needed to provide information on the position of the motor shaft after the power was switched off.

For demanding applications such as printing, lifts, cranes and materials handling that require smooth, accurate operation and precise positioning of the motor shaft on restart this meant two separate encoders were required.

The launch of the SRS 64 and SRM 64 enables OEMs and manufacturers to fit a single high performance unit to perform both speed and absolute position functions, cutting cost and installation time said Sick.

Both units also use the Hiperface interface to provide feedback, allowing them to operate with servo drives from most of the leading vendors.

Hiperface is claimed to require only eight electrical connections to transmit all speed and position data, further reducing installation time and the amount of cabling.

Those savings are not at the expense of performance.

Both the SRS 64 and SRM 64 produce over two million counts per revolution of the motor shaft, compared with the typical incremental encoder output of just 1,024 counts added Sick.

As a result, speed control is highly accurate, producing extremely smooth operation of the motor.

For absolute positioning, the single turn SRS 64 offers a resolution of 32,768 steps per revolution, providing the servo drive with very accurate information on the position of the shaft when starting the motor.

The multi turn SRM 64 measures the same number of steps per revolution but with its built-in gearbox is also able to count up to 4,096 revolutions.

That enables it to position the shaft with a resolution of over 134 million steps and makes the SRM 64 suitable for applications where the motor's rotation is converted into linear motion.

The SRM 64 does not require a battery to store information when the power is off, extending its useful life and ensuring its memory is not damaged in the event of a high electro-magnetic pulse.

Both the SRS 64 and SRM 64 can be installed on hollow motor shafts up to 14mm in diameter and operate at a maximum speed of 9,000rpm, with accurate absolute positioning guaranteed up to 6,000rpm.

Able to cope with temperatures ranging from -20 degrees C to 110 degrees C and rated to IP67, they can handle the most arduous of working environments.

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