AOYAMA MOTOR DRIVE TECHNOLOGY
One Stop Solution for
POWER ELECTRONIC APPLICATIONS



TECHNOLOGY 1


Core Technology

Peripheral Architecture

Position Sensorless
Control


Current Sensorless
Control


Publications

 
Core Technology
In recent times, due to the impending global climate/energy crisis, high efficiency, energy saving, power electronics technology is the important mission embraced by AMDT. In industrial applications, highly efficient motor drive systems are fast becoming a must, especially in the context ofi imminent global carbon emissions trading.  Low cost, consumer electronics applications too will need to be widely realized.
At AMDT we provide highly efficient and low cost motor control technology for the above by employing high performance 'position sensorless and current sensorless control technology. Our Circuit design and embedded software technology create a total solution for your need.
OUR MOTOR DRIVE/CONTROL TECHNOLOGY

1.Sinusoidal current drive for brushless motor with position and sensorless controls
• Low cost • High reliability • High speed Drive • Advanced inverters for Air Conditioning and Refrigerator compressors

2. Current Sensorless Motor Drive (1-shunt, 2-shunt)
•Miniaturised • Low Cost •Suitable for both industrial and consumer electronics applications

3. Embedded Software amalgamated with the circuit technology:
• Very cost effective •Microcomputer System integration •Miniaturised component by our circuit design

4.Speedy development with our own software
• Our original microcomputer debug tool
• Motor constant measuring tool (speeding each system adjyastment)
Peripheral Architecture
Our breakthrough technology provides control engineering elements for your product development
          
Position Sensorless Control
The sinusoidal PMSM based brushless motor drive typically requires rotor position detection. Encoders and/or resolvers are commonly used, which attribute to higher cost, low reliability (acoustic noise) Under certain conditions, like at high temperature, or at high speed rotation they may not be applicable. We have developed a Motor Control Algorithm (software) which calculates position and speed from motor current and voltage. It is utilised in compressor drive systems for air conditioning and other industrial applications.

•"Position sensorless vector control for compressor drive system - a reduction control of cyclic
  speed change" Journal D The institute of Electrical Engineers of Japan vol.127, pp.715‐722
  (2007‐7)
•"Speed Sensorless Vector Controlled Induction Motor Drives by Adaptive Observer with an
  estimated flux feedback performance improvement in low speed range " vol.128,No.3,pp329-
  339  (2008-3) Journal D  The institute of Electrical Engineers of Japan
Current Sensorless Control
The sinusoidal PMSM based brushless motor drive with vector control requires current feedback control with two of expensive hall current sensors .  For consumer electronics, it is not cost effective and for low cost appliances, responsivity is low.
We developed current sensorless algorithm suitable for calculating AC currents from sampled DC-bus current data in the one-shunt system for over current protection. Our software technology and PWM technique make it possible to realize current detection method.

• "A Method for Calculating AC Currents from Sampled DC Current Data in a Three-phase PWM
  Inverter"  vol.127,No.2,pp.181‐188(2007‐2) Journal D, The institute of Electrical Engineers of
  Japan
Publications
"The IPMSM Position Sensorless Vector Control System for the Home Appliance" PCIM China 2008, pp.56‐61(2007‐3) by T.Fukumoto, H, Hamane, Y.Hayashi

"The IPMSM Position Sensorless Vector Control System for the Home Appliance" PCIM China 2008, pp.56‐61(2007‐3) by T.Fukumoto, H.Hamane, Y.Hayashi

"Performance Improvement of the IPMSM Position Sensorless Vector Control System by the On-line Motor Parameter Error Compensation and the Practical Dead-time Compensation " The Fourth Power Conversion Conference, pp.314‐321 (2007‐4) by T.Fukumoto, H.Hamane, Y.Hayashi