Bonfiglioli BTD/BCR Servo Motor System Integration and Interface Configuration Guide

Bonfiglioli Vectron BTD/BCR Synchronous Servo Motor: System Integration and Interface Configuration

In the construction of modern industrial automation systems, the selection of servo motors is only the first step. How to perfectly integrate the motor into the existing control system architecture and achieve seamless integration at the mechanical, electrical, and software levels is often the biggest challenge faced by engineers. Bonfiglioli Vectron's BTD (high torque density) and BCR (high dynamic overload) series synchronous servo motors provide great flexibility for system integration with their standardized interface design and rich feedback options. This article will analyze in detail the mechanical installation, electrical connection, feedback configuration, and cable selection points of these two motors from the perspective of engineering practice.

Preparation before System Integration: Understanding Technical Architecture

Understanding the technical architecture of BTD/BCR motors is crucial before starting hardware connections. Both motors are optimized for working in conjunction with the Bonfiglioli Vectron ACTION series servo drives. The built-in "self-learning" function of the driver can automatically recognize motor parameters (such as stator resistance, inductance, back electromotive force constant), achieving optimal magnetic flux and torque control.

Core integration points:

The motor must be used in conjunction with a suitable servo drive, which is an organic component of the actuator (motor).

Each motor is equipped with a PTC thermistor as standard, which must be connected to the driver's safety torque cutoff (STO) or temperature monitoring input. This is the first line of defense to prevent the motor from overheating and burning out.

Electrical connections involve power circuits and signal circuits, which must be strictly distinguished and wired correctly to prevent electromagnetic interference.

Mechanical interface: standardized matching of flanges and shaft extensions

Mechanical integration is the physical foundation for the reliability of the entire system. The BTD/BCR series follows the standard Bonfiglioli mechanical interface specification (IMB table) to ensure seamless direct connection with Bonfiglioli gearbox series products.

1. Definition of mechanical interface

The "mechanical interface" consists of two parts: flange and shaft extension, with the following core dimensions (standard configuration):

Positioning stopper (A): Ensure the concentricity between the motor and the reducer or load, such as 40mm for BTD2/BCR2 and 230mm for BCR8.

Installation hole spacing (B): determines the diameter of the distribution circle of the installation bolts.

Shaft diameter (D) and shaft length (E): need to match the aperture and length of the coupling or gear. For example, BTD5/BCR5 has a shaft diameter of 24mm and a shaft length of 46.5mm.

2. Integration precautions

Axis extension form: The standard configuration is a keyless optical axis, which is matched with a clamping coupling to achieve zero backlash transmission. If a keyway is required, it must be clearly specified as an "optional variant" at the time of ordering.

Allow load verification: During integration, it is necessary to verify whether the radial force (F_R) and axial force (F_A) generated by external transmission components (such as synchronous pulleys and gears) are within the allowable range of the motor. For example, BCR4-0100 allows a radial force of 328N and an axial force of 62N. Exceeding this value will result in a sharp reduction in bearing life.

Installation direction: The motor can be installed horizontally or vertically. However, it should be noted that when selecting a holding brake, vertical installation requires checking whether the brake can hold the load and the weight of the motor.

Electrical connection: precise wiring of power and signal circuits

The correct electrical connection is the guarantee for the stable operation of the system. The BTD/BCR motor adopts standard pluggable circular connectors (compliant with Desina standards), simplifying on-site wiring.

1. Power connector

The power connector integrates motor power lines and brake control lines, using a 4+4-core design.

Wiring definition: including three-phase windings (U, V, W), protective grounding (PE), and positive (+) and negative (-) of the brake power supply. The manual clearly states that even if the actuator is not selected, its wiring position is still retained in the connector, which provides convenience for subsequent upgrades.

Wire diameter matching: The wire diameter of the power cable must be selected according to the rated current of the motor. For example, the BCR8 high-power motor requires a 10.0mm ² cable, while the small BTD2 requires a 1.5mm ² cable.

2. Signal connector

The signal connector is used to transmit signals from feedback devices (Resolver/Encoder) and PTC thermistors, and is designed with 12 cores or higher density.

Resolver interface: The standard equipped rotary transformer has 6 signal lines (Sin+, Sin -, Cos+, Cos -, Ref+, Ref -), which must be connected to the EMRES-03 interface module of the driver using twisted pair shielded cables.