SMTBD1/1M-220/04 - Speed amplifier Module - INFRANOR

INFRANOR SMTBD1/1M-220/04 variable speed drive - SMT-BD1 series

The SMTBD1/1M-220/04 is a variable speed drive module from the SMT-BD1 series by INFRANOR, designed for closed-loop speed and torque control of sinusoidal brushless AC motors using resolver feedback. This servo drive addresses applications where stable speed regulation, fast dynamic response and repeatable setpoint tracking are critical to process quality. Maintenance teams and machine builders will value its deterministic PI² speed regulator with a 0.5 ms sampling period, a standard ±10 V analog speed command interface, and auto-configuration functions that reduce commissioning time. Packaged in a 6U double Eurocard format with an IGBT power stage and DSP-based control board, the unit integrates easily in existing cabinets, supports parameterization via serial link, and stores configuration data in EEPROM for reliable power-cycle recovery.

Technical specifications

• Manufacturer: INFRANOR
• Reference: SMTBD1/1M-220/04
• Series: SMT-BD1 servo variable speed drives
• Type: PWM servo drive module for sinusoidal brushless AC motors with resolver sensor
• DC bus voltage: nominal 310 VDC, operating range 270 to 340 VDC
• Command interface: ±10 V analog speed command
• Control mode: Closed-loop speed and torque based on resolver feedback
• Speed regulator: PI² algorithm, 0.5 ms sampling period
• Speed range: up to 2048:1 with 12-bit input, up to 32768:1 with 16-bit input
• Maximum motor speed setting: adjustable from 100 to 14,000 rpm
• Accel/decel ramps: programmable from 0 to 30 s
• Encoder emulation: quadrature output up to 8192 ppr
• Continuous current rating: 4 A
• Ambient temperature: up to +40 °C nominal operation
• Hardware architecture: 6U double Eurocard, IGBT power board and DSP logic board
• Parameter management: full parameter set via serial link, stored in EEPROM
• Auto functions: auto-configuration and auto-tuning support

SMT-BD1 series overview

The INFRANOR SMT-BD1 series is dedicated to servo applications requiring accurate speed control of brushless AC motors with resolver sensing. The platform combines a robust IGBT inverter stage with DSP-based regulation, ensuring deterministic loop timing and stable tuning across a wide operating envelope. Its DC bus architecture enables deployment on common DC networks fed by a front-end rectifier or shared across multiple axes, which simplifies multi-axis machines and reduces cabinet complexity. Standard analog setpoint handling allows straightforward interfacing with PLC analog outputs and motion controllers, while resolver feedback provides resilience in electrically noisy industrial environments and reliable rotor position information for field-oriented speed regulation. Encoder emulation further facilitates position capture or speed feedback for higher-level controllers and existing CNC systems.

• Closed-loop precision: The PI² speed loop with 0.5 ms sampling delivers fast response to setpoint changes and disturbances, improving product consistency on lines sensitive to tension, feed rate or synchronization.
• Wide speed adaptability: Adjustable maximum speed from 100 to 14,000 rpm and large usable ratios up to 32768:1 with high-resolution inputs support both low-speed torque tasks and high-speed auxiliary drives.
• Commissioning efficiency: Auto-configuration and auto-tuning functions shorten setup time and help maintenance teams restore service quickly after component replacement.
• Integration flexibility: The ±10 V command input, serial parameterization and encoder emulation simplify retrofits and interoperation with legacy automation systems.
• Operational reliability: EEPROM-stored parameters and a compact 6U Eurocard format support predictable behavior after power cycles and easy module exchange in the field.

Because the SMT-BD1 targets resolver-equipped brushless motors, it is relevant for environments where robust feedback is required, including high-vibration zones or areas with electromagnetic interference. The 4 A continuous current rating, in combination with the specified DC bus range, makes this drive suitable for small to mid-scale servo axes where accurate speed control is prioritized. When paired with matched motors and proper shielding, the drive helps maintain speed constancy under varying load, a key factor for uniform throughput and reduced scrap.

Industrial applications

The SMTBD1/1M-220/04 variable speed drive integrates in a wide spectrum of motion tasks where speed stability and dynamic control translate directly into process performance.

• Machine tools and CNC auxiliaries: Regulation of auxiliary axes, tool changers and spindle support functions requiring responsive speed control and encoder feedback compatibility.
• Packaging and converting: Web handling, roll drives and nip control with programmable ramps to smooth acceleration and protect materials.
• Conveying and indexing: Precision speed tracking for feeders and conveyors that must synchronize with upstream or downstream equipment.
• Robotics and handling: Servo axes in pick-and-place or cartesian systems where resolver feedback ensures reliable position reference for speed loops.
• Textile and winding: Tension-sensitive processes benefiting from steady-state speed accuracy and fast disturbance rejection.

Integration and commissioning

Electrical integration typically involves connecting the drive to a 270–340 VDC bus supplied by a front-end rectifier or a shared DC link, routing three-phase motor leads to the output stage, and wiring the resolver. The ±10 V analog input accepts speed commands from PLC or motion controller analog outputs, while encoder emulation provides quadrature signals up to 8192 ppr for systems that require incremental feedback to higher-level control. Commissioning is performed via the serial link, with parameter sets saved in EEPROM to secure repeatable behavior after shutdowns. The programmable 0 to 30 s acceleration and deceleration ramps allow matching the drivetrain’s mechanical constraints and reducing inrush torques. Auto-tuning helps identify appropriate regulator gains, which is beneficial during maintenance interventions or motor replacements. When specifying this unit, select the motor and mechanical transmission so that nominal current remains within the 4 A continuous rating and the required top speed falls within the 100 to 14,000 rpm adjustable limit.

From a controls perspective, the closed-loop speed and torque functions based on resolver feedback make the SMTBD1/1M-220/04 a practical option wherever deterministic speed control is needed without implementing full position loops in the drive. In multi-axis machines, the module can be operated on a shared DC bus to improve energy efficiency through regenerative power sharing between axes, provided that the installation’s front-end and braking arrangements are designed accordingly. Shielding practices, proper grounding and cable segregation remain essential to preserve signal integrity for the resolver and the encoder emulation outputs.

Availability and service

This INFRANOR SMTBD1/1M-220/04 variable speed drive is available through Standard Exchange Industry in multiple service modes, including exchange, supply of refurbished or new units subject to stock, and repair of customer equipment. Each unit is functionally tested on a dedicated bench. Dispatch is organized within 24 to 72 hours to more than 120 countries. Our technical team assists with cross-referencing within the SMT-BD1 family and validates the compatibility of resolver wiring, DC bus conditions and current requirements. Deliveries are backed by warranty according to the selected service. If your production line is down, SEI can help identify the correct configuration and propose an equivalent reference within the SMT-BD1 range when necessary.