International Rectifier’s iMOTION™ integrated design platform features a mixed-signal controller and companion intelligent power modules as well as algorithms, development software and design tools for appliance applications driven by Permanent Magnet Synchronous Motors (PMSM).
Integrated Design Platform
iMOTION comprises an innovative silicon- and tool-set for rapid development of energy-saving motors from a systems level. The platform enables variable-speed sinusoidal-current control without the need for position sensors for smooth torque output and lower acoustic noise in PM motor applications. The optimized system architecture combines IR’s proprietary high voltage integrated circuit (HVIC) technology with analog, digital and power building blocks, along with digital control algorithms, for sensorless motor control applications using DC link phase current sensing.
The iMOTION integrated design platform for washers simplifies variable-speed motor-control design in both horizontal- and vertical-axis washing machines, accelerating time-to-market and reducing overall system cost. The new platform, featuring an embedded Field Oriented Control (FOC) algorithm for high-dynamic torque control, improves washing cycles—consuming less hot water to save up to 70 percent of energy use. The high speed field weakening algorithm improves moisture extraction in the spin cycle enabling further energy savings in the dryer.
Mixed Signal Control
The high-performance IRMCF341 washer control IC integrates all the control and analog interface functions required for sensorless speed control of PMS motors using DC link current measurements. The analog functions on the IC include differential amplifier, dual sample and hold circuits and a 12-bit A/D converter to sample the low-voltage signal across the DC link shunt. The digital control IC features IR’s patented Motion Control Engine (MCETM) that eliminates software coding from the motion control algorithm development process. A co-integrated 60MIPS, 8-bit, 8051 microcontroller enables application layer software development, operating almost independently of the MCE and does not compete for system resources such as interrupts or internal registers. This streamlines application software debugging since the MCE can be treated very much like hardware peripheral with a set of input and output registers. The embedded Analog Signal Engine (ASE) integrates all the signal conditioning and conversion circuits required for single current shunt, sensorless control of a PMS motor. The IRMCF341 control IC is available in a 64-pin QFP package with all the required analog inputs and PWM outputs to control the washing machine motor.
Intelligent Power Modules
The companion IRAMS06UP60B and IRAMS10UP60B inverter power modules feature an advanced high-voltage gate drive IC for three-phase inverter control. The modules include the DC link shunt used for both motor current measurement and power module protection. Built-in over-temperature/over-current protection, along with short-circuit rated IGBTs, an integrated under-voltage lockout function, and built-in temperature monitor provide a high level of protection and fail-safe operation.
The platform includes the IRMCS3041 reference design, in addition to web-based software tools, to customize application requirements. The embedded Field Oriented Control (FOC) algorithm optimizes the output torque from interior permanent magnet motors and maximizes bus voltage utilization in the high-speed field weakening mode.
Tools include communications software running on the 8051 microcontroller that gives the PC-based MCEDesigner™ software access to the control parameters and system variables in the shared memory. This allows modification of the controller set points and control loop gains and other constants without needing to modify or compile software. MCEDesigner tools generate wash-cycle profiles and plot motor speed and current, accelerating rapid evaluation of direct-drive motor performance with real washing loads.
Data sheets and application notes are available on the International Rectifier Web site, www.irf.com.
About International Rectifier
International Rectifier is a world leader in power management technology. IR’s analog and mixed signal ICs, advanced circuit devices, integrated power systems and components enable high performance computing and reduce energy waste from motors, the world’s single largest consumer of electricity. Leading manufacturers of computers, energy efficient appliances, lighting, automobiles, satellites, aircraft, and defense systems rely on IR’s power management benchmarks to power their next generation products.
ASE™, iMOTION™, IR®, MCE™, and MCEDesigner™ are trademarks of International Rectifier Corporation. All other product names noted herein may be trademarks of their respective holders.
For more information, contact International Rectifier; Web site: www.irf.com. International Rectifier