In this paper, we present the development of a high-efficiency electronic commutated (EC) motor using nonoriented electrical steel produced by China Steel Corporation for window-type air-conditioning ...system applications. The EC motor combines the highly efficient brushless DC electric motor, Hall-effect sensor, driver, and AC/DC converter, but it has similar volume and equivalent performance to the traditional AC motor. By analyzing the material properties and using simulation tools, an EC motor with a high efficiency of about 82–86.4% is demonstrated in this study. A system manufacturer can replace the AC motor with an EC motor directly in the air-conditioning system for higher performance and save more energy, without altering the mechanical design.
Electronically commutated motors can radiate high electrical fields in the lower frequency range up to 10 MHz. The radiation stems from the motor itself and not from the connected wiring harness. ...Several hypotheses for this direct radiation were examined. An analysis by 3D electro-magnetic field simulations reveals the root cause. Based on the simulation results a simple network model could be generated, which allows further studies in a short computation time.
The article presents the methods of the control of electrical motors used in modern buildings. The control procedures are strictly connected to the fieldsof applications as the ventilation, air ...conditioning and other sanitary installations. Possible control structures for different types of motors used, especially for EC motors are presented. The abbreviated operating principle of the increasingly popular and increasingly used EC engine is presented, as well as its control methods and the advantages and disadvantages associated with its application. The whole article is described from the perspective of control automation and the problems and facilitations that are associated with the use of various electrical motors for this discipline.
Small two-stroke gasoline engines are the major power source for professional outdoor power equipment such as hedge trimmers, chain saws, blowers and cut-off saws. However, electric motors energized ...with Lithium-Ion-based batteries as a power source strongly catch up. For some time now, small non-professional equipment with a battery-based power source is available. But only since 2010 professional grade cordless mobile power chain saws are available. The effective cutting performance of the top products still seemed to be limited to the equivalent of the smallest gasoline chain saws. With enhanced motor performance and strict target technology development it is now for the first time possible to launch professional battery chain saws with further increased output power. To achieve this optimization in performance but also in terms of production stability and cost it was necessary to investigate both the requirements of the classic product development and the production process together. This article focuses on an outer rotor EC-motor. Ways for enhancing energy efficiency and their influence on the production process are derived. An approach for optimizing production in terms of cost-effectiveness and stable premium quality is discussed.
Electronically commutated motors produce a mechanical torque by switching the currents in their stator winding system according to the instantaneous rotor position during rotation. The rotor position ...is determined by Hall sensors capturing the magnetic field of the rotor's permanent magnets. In operation, the Hall sensors are exposed not only to the rotor field, but also to the field of stator windings. This inevitably leads to a certain commutation angle error (CA error) and a reduced motor performance. This paper presents a general 3-D magnetic field simulation approach for computing the CA error and for finding an optimal position of the Hall sensors. The obtained numerical results and their verification by measurements are presented in detail.
Quality ranking of finished products plays an important role in manufacturing systems. In this paper, we address the problem of quality ranking of electronically commutated (EC) motors by subjecting ...each finished product to a short measurement session. Based on the features calculated from these measurements, the motor quality is assessed by introducing a novel copula-based decision support system (DSS). The proposed DSS provides a full ranking of EC motors by integrating expert’s preferences and company’s quality standards. This approach overcomes the shortcomings of the traditional regression models, such as partial ranking and inconsistent evaluations with the expert’s expectations. We demonstrate the effectiveness of the proposed DSS on a test batch of 840 EC motors.
An integrated GMR (Giant Magneto Resistance) angle sensor will be presented which is designed to fulfill requirements for electrical commutated motor-drives. These motors use sine-commutation for the ...coils and need the angle of the motor-shaft in accuracy ranges below 1∘ with update-rates of 50- 100 μs. This integrated GMR Angle sensor solves this problem using integrated GMR Angle-Sensors on top of the silicon signal processing chip. The differential GMR-bridge signals are converted to the digital domain by sigma-delta ADCs and these raw-signals are error-compensated. An additional autocalibration feature is implemented to improve the accuracy during operation. The very fast angle-measurement is performed using parallel analog signal processing, 24 MHz finite state machine with dedicated peripherals and an 8 Mbit/s SPI interface. An additional feature to reduce the time delay is the implemented angle-value prediction. Built-in selftests, switchable voltages for signal-path tests and multiple safety voltage comparators are implemented for safety-critical applications.
Due to the hybridization and change of hydraulic systems into electrical systems, the number of electric commutated motors in vehicles is increasing dramatically. There is a trend towards brushless ...motors, as they have no wearing parts (brushes), low acoustic buzz and very low torque rippling. In order to ensure exact commutation of electric motors the position of the rotor has to be measured very accurately over a wide speed range. The position is afterwards transferred to the control unit, which generates the necessary commutation sequence for the motor. In the last years the position sensing was done by Hall switches for block commutation. Nowadays, the call for absolute position sensors for sinusoidal commutation in motors is getting louder. Giant Magneto Resistance (GMR) angle sensors 1-4 offer a perfect solution.
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