Product Description:

The HSM845 brushless servo motor is produced by Kollmorgen and belongs to the HSM Brushless Servo Motors series. The unit couples a permanent-magnet rotor with a feedback encoder so a drive can regulate shaft position, velocity, and acceleration with minimal error. Its frame size and thermal path target medium-to-heavy industrial loads where closed-loop accuracy must be maintained through continuous duty cycles, making it a common rotary actuator in packaging lines, gantry axes, and process machinery.

Electrical output is anchored by a continuous torque of 50.8 Nm, while short bursts can reach 124.3 Nm for indexing or rapid acceleration profiles. A torque constant of 1.0 Nm/A links commanded phase current to shaft torque, and the back EMF constant of 112 V/kRPM indicates the voltage generated during regenerative events. Position feedback comes from an optical encoder that produces 2000 quadrature pulses per revolution, giving the drive fine incremental data for tight control loops. Dynamic response is aided by a rotor inertia of 0.00937 kg·m², and copper losses are limited by a winding resistance of 0.10 Ω. The stator has an inductance of 2.4 mH, which smooths current ripple and supports stable current regulation.

The mounting interface uses a bolt circle of 265 mm with mounting holes drilled to a diameter of 15 mm for through-frame fasteners. The overall length measures 426 mm and increases to 529 mm when the optional brake is installed. The assembly weighs 56.1 kg, which requires a mounting surface capable of supporting the motor securely during operation. The shaft carries an M8 × 1.25 thread to a depth of 20 mm for accessory retention, and it withstands radial loading up to 413 lb at 3000 rpm. The flange arrangement supports rigid attachment to compatible gearboxes or belt-drive assemblies without additional adapters.