Bonfiglioli BMS series servo reduction motor selection and integration guide

H-type (High): can provide higher maximum speed at the same voltage n a two n a2

Suitable for application scenarios that require high-speed operation.

Selection influence: Choosing a higher overspeed variant can increase the maximum speed, but the rated torque

Mn two M n2 Usually unchanged and requires the driver to provide higher peak current Ia

Engineers need to strike a balance between speed and drive capacity.

3.2 Bearing Life Calculation

The bearing life of the output shaft is an important indicator for measuring the reliability of the gearbox. In BMS, in addition to radial force

R two And axial force A two

We also need to consider the overturning moment M T two M T2

Calculate equivalent overturning moment MT two EQUM T2EQU

The formula takes into account the force arm xX and L two

Waiting for installation size factors:

MT two

EQU=R two EQU⋅(x+Ltwo)+Atwo

EQU⋅y one thousand

M T2EQU= one thousand R 2EQU⋅(x+L two)+A 2EQU⋅y

Then use the basic rated life formula of the bearing:

Lten h=sixteen thousand six hundred and sixty-six n two

EQU(CBMT two EQU)pL 10h= n 2EQU sixteen thousand six hundred and sixty-six( M T2EQU C B ) p

 Through this formula, it is possible to reverse validate the required size of gearbox based on the expected lifespan target (such as 20000 hours). The document provides information on BMS 060 to 160 models

CB(Bearing constant) and index P-value.

Chapter 4: Feedback Device, Braking and System Integration

As a complete driving unit, the core advantage of BMS lies in its seamless integration with Bonfiglioli Vectron ACTION series frequency converters.

4.1 Feedback device selection

To meet different control accuracy requirements, BMS provides multiple feedback options (Chapter 38):

Resolver: Standard solution, using RES1 or RES2 interface. The rotary transformer has extremely high resistance to vibration and high temperature, suitable for use in harsh environments, and its position information is single turn absolute.

EnDat and Hiperface encoders: providing optical or capacitive encoders for applications that pursue high precision and high response.

ENB1/ENB2: Using Heidenhain EnDat protocol, providing absolute position information for single and multiple laps.

ENB3/ENB4/ENB5: Adopting SICK Hiperface protocol.

4.2 Thermal protection and brake configuration

Thermal protection (Chapter 40): The built-in PTC thermistor (150 ° C jump) or KTY sensor ensures safe operation of the motor winding within the F-class insulation (155 ° C) limit. When setting parameters, it is necessary to set the analog input of the frequency converter (such as the Active series MFI1A) to the corresponding sensor type.

Brake (Chapter 41): The BMS can be equipped with a permanent magnet brake, specifically designed for power-off holding (Holding Brake). Attention: The braking torque of the brake should be multiplied by the speed ratio to obtain the output shaft braking torque（

Mb two=Mb×iM b2=M b(x i). This brake is not recommended for use as a dynamic deceleration brake (except in emergency situations).

4.3 Cable and Connection System

BMS adopts a standardized connection system that complies with DESINA standards, greatly simplifying wiring work.

Power cord (orange): Integrated with motor power cord and brake wire (if any).

Signal line (green): used to transmit feedback device signals and thermistor signals.

Selection tip: Bangfeili provides prefabricated cables with standard lengths of 3 meters, 5 meters, and 10 meters, and is available with straight heads and elbows (AN type) for selection. The use of shielded prefabricated cables is key to ensuring EMC performance and signal integrity.