Product Description:

The M.1015.7990 is a brushless servo motor developed by Kollmorgen for the HSM Brushless Servo Motors series. As a rotary actuator, it converts current into shaft motion for positioning tasks in industrial automation, such as controlling indexing tables. An integrated electromagnetic brake holds the shaft upon loss of power, while an incremental encoder sends rotor angle data to the drive controller. These components support closed-loop positioning and prevent unintended shaft movement when the motor is not energized.

The rotor has a rated mechanical speed of 5000 rpm, allowing it to follow rapid indexing commands without exceeding structural limits. The stator is wound for 230 VAC line-to-line operation, making it compatible with standard drives that synthesize three-phase excitation. Electrical dynamics are governed by a phase inductance of 3.4 mH and a phase resistance of 1.3 Ω; together, these values affect current rise time and copper loss during acceleration. Torque sensitivity with sinusoidal commutation is 0.28 Nm/A, allowing controllers to calculate output torque directly from commanded current. Six permanent-magnet poles establish the electrical frequency, while the encoder produces 2,000 lines per revolution and provides 8,000 counts after quadrature decoding. A thermal resistance of 0.89 °C/W indicates the temperature increase per watt dissipated and supports cooling calculations for continuous operation.

The holding brake supplies 2.26 Nm of static torque and has 1° 30′ of backlash, which affects positional accuracy when the shaft is clamped. The brake releases at a coil current of 0.13 A and engages when 90 VDC is removed. The complete assembly weighs 4.9 kg. The brake rotor contributes an inertia of 0.000089 kg-m², which must be included when tuning the servo system. Square-wave commutation provides a torque constant of 0.31 Nm/A, while the motor’s back EMF increases with speed at 34 V/krpm. These electrical relationships allow the drive electronics to estimate velocity, manage regenerated energy, and apply current limits that remain within the motor’s magnetic and thermal limits.