Total Drive - Digital Motor Drive Module

The International Rectifier IRMCT3UF1 supports integration of PM motor systems requiring sensorless control of speed/torque over a wide speed range (20:1) and performance (high starting torque, high speed). Sinusoidal commutation and field oriented control (FOC) combined with low loss PWM minimizes torque ripple, improves motor efficiency, and boosts torque per ampere.

IR’s popular new sensorless iMOTION technology simplifies configuration of the controller to suit a wide variety of PMAC and BLDC type motors. Users can quickly evaluate the technology and then tailor the drive design to a particular application using the ServoDesigner development tool. Motion control products developed in this new software-less manner can thus be brought to market faster using the powerful register-mapped tools for configuration of motor and application parameters.

The IR Advantage
Designed for high reliability the iMOTION IRMCT3UF1 is a complete motor drive housed within a compact 2” by 4” near hermetic package. This device has advantages over traditional motor drive designs

The IRMCT3UF1 embedded Motion Control Engine™ (MCE) eliminates software programming
Closed loop sensor-less control, so no voltage feedback is required minimizing additional hardware
Complete sine-drive supports efficient
2-phase and quiet 3-phase center aligned and asymmetrical SVM (space vector modulation) operation – up to 15kHz max carrier frequency
Configurable architecture supports a variety of PMAC/BLDC motors
Accurate speed regulation, (1% or better) with integrated start and ramp functions
Wide 20:1 controlled speed range – up to PWM-rate/2 max speed command rate
Fast control loop computation time –
11 μsec to support high speed motors.
Output current up to 15 A continuous 20 A peak (28 volt DC bus).
Bus voltage up to 48 VDC max.
Command/diagnostic RS232C interface with speed = 57.6 kbps
Discrete I/O includes START/STOP, FAULT/FAULTCLR
Low RDS(on) MOSFETS, Mounted on low Rth = 1.5°C/W IMS substrate. Uses IR’s advanced HVIC Gate Drivers with matching delay characteristics.
Operating temp range -40°C to +85°C
Designed to Vibration guidelines of DO-160

Motion Control Engine
The heart of the IRMCT3UF1 is the digital motion control engine (MCE) enabling rapid configuration of motor control parameters
Hardware based (not DSP,FPGA, or microcontroller) reduces FAA certification concerns
The sensorless vector control algorithm includes a unique host interface with drive command parameters mapped to aninternal register location
Diagnostic features are embedded in this algorithm to enable rapid parameter adjustment identification during development of a motor drive
Due to the flexibility of the control algorithm, a wide variety of PMAC and BLDC motors can be controlled with register based parameter modification
PC Based Servo Designer Development Tool
Motor design is simplified with the IRMCT3UF1 using IR’s proprietary Servo designer development tool. This tool allows for easy menu based motor configuration and registry loading to the IRMCT3UF1. Servo designer is a free development tool and is included with the IRM.

Motor commissioning can be achieved in a few intuitive steps:

    1 Motor Data and design parameters are entered in the Servo-designer spreadsheet.

    2 Spreadsheet translates high level parameters to digital domain parameters

    3 Import/set-up parameters are downloaded to module host registers via RS232 interface.

Motor performance monitoring and further optimization adjustments can made with IR’s motion control technology.

This menu-based approach eliminates code development loops and dramatically reduces drive commissioning time

Applications
The versatile IRMCT3UF1 Motor drive module is applicable in any High reliability speed or torque control of a PMAC or BLDC motor. Application include:
  • Aircraft Fuel Pumps - Transfer and Boost Pump Systems
  • Fans and Blowers - Turbo-Cooling Systems
  • Compressors/Fans - Environmental Control Systems
  • Hydraulic Pumps - Actuation Systems
  • Coolant Pumps - Laser andn Electronics Cooling Systems
  • Small Power Generators - Starting Systems
  • Vetronics Traction - Propulsion Systems
  • Hoist and Winches - Deploy/Retract Systems
  • Actuators - Electro-Hydrostatic Actuators
  • Robotics - Any robotic movement requiring speed or torque control

HiRel iMOTION Package
  • Thermally conductive, Insulated Metal Substrate (IMS) for the power MOSFETS
  • Lightweight Plastic (2.0 in by 4.0 in) ring frame and cover
  • Internal PCB with motor control circuitry
  • Near hermetic “Tri Seal” Encapsulated to meet environmental conditions
  • -40°C to +85°C operating temperature range
  • Screened in accordance with the methods of MIL-STD-883
  • Vibration performance in accordance with design DO-160 guidelines
Technical Articles:

Compact, Rugged Digital Sine Drive for High Reliability Applications PDF

Digital Speed Controller for Embedded High Reliability Applications PDF

Sensorless Digital Motor Controller for High Reliability Applications PDF