Product Description:

The BH-122-A-63 is a frameless brushless servo motor produced by Kollmorgen within the Kollmorgen Goldline B and BH Motors series. It is engineered for precision positioning and speed regulation in industrial automation, converting commanded phase current into controlled rotary motion for packaging lines, robotic joints, and semiconductor tooling. The laminated stator accepts sinusoidal excitation from digital drives, and the compact construction fits into tight machine envelopes while keeping reflected inertia low for fast dynamic response. Because it is a frameless motor, it is commonly integrated directly into the machine structure, which helps reduce added drivetrain components and supports compact axis layouts.

The back electromotive force constant is 42.6 Vrms/kRPM, so every 1000 rpm of shaft speed generates that voltage between phases, enabling velocity estimation by the drive electronics. Under continuous stall conditions, the motor supplies 0.7 N·m while drawing 1 Arms, which helps maintain winding temperature within limits during static holding tasks. Conversion efficiency is reflected by a torque constant of 0.705 N·m/Arms, linking commanded current directly to output torque. A winding inductance of 120 mH affects current rise time and influences current-loop bandwidth. The rotor’s low inertia of 0.0000309 kg·m² supports rapid acceleration and helps reduce overshoot during high-speed point-to-point moves.

For transient events, the motor tolerates up to 2.4 N·m of torque while carrying 3.6 Arms, providing reserve capacity for quick indexing or short load disturbances. Thermal behavior is characterized by a 10 min thermal time constant, which allows brief overloads without immediate derating. The electromagnetic structure contains 4 poles, supporting smooth commutation and reduced cogging during rotation. Additional parameters such as 35 Ω DC resistance, 0.041 N·m static friction, and 0.0027 N·m/kRPM viscous damping help estimate voltage demand, expected heat generation, and low-speed mechanical losses in a closed-loop axis.