Product Description:

The HSM620 brushless servo motor is manufactured by Kollmorgen as part of the HSM Brushless Servo Motors series. This rotary actuator uses a permanent-magnet rotor and integrated feedback to deliver precise motion profiles in automated assembly, packaging, and machining equipment. By converting drive current into controlled shaft torque, the motor provides the commanded position or speed without mechanical gearing.

Under continuous duty the HSM620 develops a rated torque of 20.9 Nm, while short bursts up to 52.2 Nm are available for acceleration or shock loading. These output levels scale from an electromagnetic design that produces 0.72 Nm/A of torque per phase ampere and corresponds to a back electromotive force constant of 80 V/kRPM, a value the drive must match when selecting bus voltage and current limits. Phase copper loss is governed by a winding resistance of 0.18 Ω, and the associated inductance of 2.2 mH shapes current rise time during rapid commands. Together these electrical parameters guide controller loop tuning and determine how quickly the motor can track changing motion profiles.

The motor’s moving system carries a rotor inertia of 0.00237 kg·m², supporting stable control when coupled to medium-inertia loads. Position feedback is delivered by an optical encoder that generates 2000 quadrature pulses, supplying the drive with fine incremental resolution. Installation is through a 200 mm bolt circle with 13.5 mm mounting holes, a 38 mm shaft that terminates in an M8 × 1.25 mm threaded end with 20 mm depth, and an overall length of 353 mm. The assembly tolerates 469 lb of radial load at 500 rpm and weighs 27.0 kg, factors that influence bearing life and machine-frame sizing.