Bonfiglioli BMD Servo Motor Selection and Configuration Guide

Temperature sensor: BMD motor comes standard with PTC thermistor (KTY or PT1000 optional). On page 52 of the manual, it is clearly stated that the PTC switch temperature matches the F-class insulation (usually 155 ℃). The KTY sensor provides a linear resistance change from 0 ℃ to 170 ℃, which is suitable for situations that require real-time temperature monitoring rather than just switch protection.

Nameplate Analysis: On page 10 of the manual, the nameplate fields are demonstrated through examples, with a focus on the locked rotor torque（M0）Rated torque（Mn）Blocked rotor current（I0）And the back electromotive force constant（Ke）. When debugging servo drives,Ke Value is a key input parameter for calculating weak magnetic points and estimating the angle of the motor magnetic field.

Common selection misconceptions and pitfalls avoidance guide

Neglecting the difference between "stall torque" and "rated torque":

When operating at medium to high speeds (such as above 3000 rpm), the rated torque increases due to iron loss and mechanical friction（Mn）It will be significantly lower than the stalling torque（M0）. The data on page 24 of the manual for BMD 65 0.85Nm shows that its locked rotor torque is 0.85Nm, but at 6000rpm, the rated torque drops to 0.73Nm. If the locked rotor torque is selected, it will cause the motor to overheat at high speeds.

Parser matching failed:

The input voltage and frequency of the Resolver are listed on page 49 of the manual (e.g. RES1 is 7Vrms/10kHz). If the excitation voltage or frequency of the selected third-party driver does not match (for example, some domestic drivers only support 5V/5kHz), the accuracy of the solver will significantly decrease, and it may even fail to work properly.

Insufficient axial/radial load verification:

The maximum radial load provided on page 22 of the manual（FR）The curve is calculated based on a bearing life of 20000 hours. For example, when BMD 118 outputs 6000rpm, the allowable radial force is only about 115N. If synchronous belt transmission is used and the belt tension calculation is too large, it will directly lead to premature fatigue failure of the bearing.