Product Description:

Kollmorgen manufactures the SERVOSTAR-443M-S, a servo amplifier in the S400 Servo Drives series. The unit forms the power stage between a motion controller and a three-phase brushless motor, generating controlled current loops that translate command signals into rotor torque for positioning, tensioning, or speed regulation tasks. This arrangement lets the amplifier execute commanded motion profiles with predictable motor response during changes in load. Its compact housing suits control cabinets where space is limited and where several axes may need to be mounted side by side.

The drive’s control electronics are sustained by a 24 VDC auxiliary supply that keeps internal logic active during line-power interruptions and enables orderly fieldbus shutdown routines. Protection on the DC link trips at 750 V, preventing semiconductor overstress when regenerated energy raises bus voltage. Fast torque response is supported by a current regulator update interval of 62.5 µs, while the output transistors are pulse-width modulated at 8 kHz to limit motor acoustic noise and reduce switching losses. Under continuous operation, the inverter can deliver 3 Arms to the motor windings, matching the output stage to compatible servomotor inductance values. An internal 33 Ω brake resistor connects automatically when the DC bus rises, so excess kinetic energy is dissipated without an external resistor bank.

During acceleration or brief overload demand, the current can rise to 9 Arms, allowing additional torque without violating thermal limits. The upstream supply must withstand up to 12 kVA of installed load, a figure that includes switching peaks. Motor inductance can be as high as 75 mH while remaining within controller stability margins. Heat generated by conduction losses is quantified as 35 W at rated load, so normal cabinet ventilation is sufficient, and quiescent dissipation drops to 12 W when the drive is idle.