KBM-25H01-A03 Kollmorgen
Wake Industrial LLC is not an authorized distributor of this product.
The Kollmorgen KBM-25H01-A03 is part of the KBM Brushless Motors series. This motor delivers a continuous stall torque of 4.9 Nm and a peak stall torque of 14.37 Nm, with a continuous stall current of 3.1 Arms. It features a back EMF constant of 100.3 Vrms per kRPM and has 10 poles.
Internal Product Review
The KBM-25H01-A03 is a well-engineered Kollmorgen brushless motor with 4.9 N·m continuous stall torque and a 1.65 N·m/Arms torque constant. A 14.37 N·m peak stall torque paired with 10.86 Arms peak stall current gives the unit strong transient capability for demanding servo duty. Stable electromagnetic behavior from 37 mH inductance and a 100.3 Vrms/kRPM back EMF constant makes the motor a very capable choice for precision motion systems.
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Product Description:
The KBM-25H01-A03 is a frameless brushless motor kit from Kollmorgen’s KBM Brushless Motors series. Supplied without a housing or bearings, the stator and rotor are built directly into the machine structure so that the load couples to the magnetic core without an intermediate transmission. This configuration is favored in semiconductor tools, packaging axes, and other industrial automation platforms that require compact direct-drive torque.
The motor can deliver continuous torque of 4.9 N·m while drawing only 3.1 Arms at the windings, keeping the temperature rise manageable in embedded installations. When short-term acceleration is needed, output increases to 14.37 N·m with a corresponding current surge to 10.86 Arms. The motor has a torque constant of 1.65 N·m/Arms, so drive current scales linearly with shaft torque. The generated back electromotive force measures 100.3 Vrms/kRPM, which requires the servo amplifier to provide adequate DC-bus voltage to avoid saturation at speed. With ten magnetic poles, the electrical frequency remains moderate, reducing iron losses and improving low-speed smoothness. Static friction is 0.0925 N·m, which indicates the torque needed to initiate rotor movement. Viscous damping of 0.0309 N·m/kRPM helps stabilize velocity control during changes in speed.
An inductance of 37 mH and phase resistance of 8.98 Ω establish the electrical time constant that the current regulator must track for fast and stable control. For inertial matching, the rotor’s steel core contributes only 0.000266 kg·m², allowing rapid direction changes without excessive drive effort. The low detent torque inherent in the slotless KBM design supports fine position resolution and minimal cogging in precision stages, pick-and-place heads, and gimbal joints. Because the machine structure supports the motor components directly, the installation must provide suitable alignment, bearing support, and heat dissipation. Direct integration also allows the surrounding mechanism to be designed around available space instead of accommodating a conventional motor housing.
