Bonfiglioli BTD/BCR Synchronous Servo Motor Selection and Interface Configuration Guide

Signal cables: divided into resolver cables (8RTCxx25) and EnDat/Hiperface cables (17ETCx01/12HTCxx01) according to feedback types.

Length: The standard offers three specifications: 3 meters, 5 meters, and 10 meters. Signal attenuation and voltage drop should be considered when exceeding 10 meters, and the manufacturer should be consulted.

Selection process and examples

Selection steps:

Define application requirements: Calculate the required continuous torque (M.rms), peak torque (M.peak), and maximum speed (n_max).

Select Series: Pre select BTD (Compact) or BCR (High Overload) series based on installation space and overload requirements.

Preliminary Table Selection: In the performance table of the corresponding series, find the machine base number (size) with locked rotor torque (M ₀) and rated torque (M ₙ) that satisfy M ₙ ≥ M rms and peak torque (M max ≥ M peak).

Verification of inertia: Calculate the ratio of load inertia (JL) to motor inertia (JM) to ensure compliance with dynamic requirements (JL/JM ≤ 5-10 times).

Verify mechanical load: Confirm that the external radial/axial load is less than the allowable value of the motor.

Select feedback and accessories: Select the feedback type (Resolve/Encoder) based on control accuracy requirements, and confirm whether a brake is needed based on vertical axis or shutdown requirements.

Configure order number: Generate a complete order number based on the selected parameters and the commercial code rules in the manual.

Example: A packaging machine needs to drive a cutting blade, with a calculated continuous torque of 4 Nm, peak torque of 12 Nm, and a speed of 2800 min ⁻¹. The installation space is limited. In the BTD series, the torque of BTD4-0410 (M ₀=4.1Nm, M ₙ=3.2Nm) is close to the limit, and the peak value of 11Nm is slightly lower; BTD4-0630 (M ₀=6.3Nm, M ₙ=4.6Nm) can provide sufficient margin. Ultimately, BTD4-0630-30-400 can be used in conjunction with a rotary transformer, and the radial load should be verified to meet the requirement of 648N.