Baldor is introducing a range of ultra-compact brushless ac servo motors that offer machine builders a high-performance and low-maintenance alternative to stepper motors and dc servos.

Capable of delivering peak torques of up to 3.8Nm, as well as with other dynamic performance attributes of servo motors such as fast acceleration, the new motors are packaged in small 40 and 60mm square bodies.

Designated the BSM R-series, the motors are expected to appeal to automation equipment builders seeking to improve the productivity of machinery in applications such as packaging and labelling, materials handling, semiconductor manufacturing, winding and printing. Special features employed in the motors' construction mean that their action is virtually 'cog free', providing very smooth motion at slow speeds. This also makes the motors suitable for precision motion applications such as in medical equipment, semiconductor processing equipment, and instrumentation.

Users can choose from either 40 or 60mm square frame sizes and one or two winding stacks. This provides developers with a selection of continuous stall torque ratings spanning 0.16-1.27Nm and peak torques from 0.48-3.8Nm. The smallest one-stack motor measures 40mm square by 59mm long and weighs just 0.4kg. Power and feedback connections to the motors are made by long flying leads.

Another option is a resolver or 2000 PPR encoder for positional feedback, and a 24V dc brake is also available.

BSM R-series