Designers looking to save power and size are turning to advanced technologies, and motors are no exception. With piezoelectric technology at the heart, a new type of motor is improving small-scale motion systems in a big way. Electronic access control enhances security, convenience, safety, and flexibility in a wide range of applications from building automation to automobiles. Today, system designers are adding "smallest size" to the requirements list for the electronic actuators at the core of access control systems.

The Energy Policy and Conservation Act (EPCA) of 1975 established an energy conservation program for major household appliances. The National Energy Conservation Policy Act of 1978 amended EPCA to add Part C of Title III, which established an energy conservation program for certain industrial equipment. The Energy Policy Act of 1992 (EPACT) also amended EPCA, and included amendments that expanded title III to include small electric motors. The Department of Energy, Office of Energy Efficiency and Renewable Energy, Building Technologies Program conducts the program that develops equipment energy conservation standards and has overall responsibility for rulemaking activities for small electric motors in fulfillment of the law.

nventor who stumbled upon a way of making electric induction motors work, at the very least, more efficiently

. At most, he believes he's figured out a way to manipulate magnetic fields so that instead of slowing down a generator (according to Lenz's law in physics) it speeds it up. In fact, it gets caught in a positive feedback loop, resulting in a dramatic acceleration without any change to power input.

In this work, some fundamental aspects concerning the efficiency of induction machines are treated. The standards and the therein prescribed methods for the determination of the energy efficiency of induction machines are discussed. A detailed comparison of the four most relevant and recent methods identifies the differences. By means of measurement results of different machines, the differences between and the shortcomings of certain methods is confirmed. In that context, special attention is paid to the new, so-called ‘Eh-Y’ method. A concise overview of the most important points of attention for an increased efficiency of motor drives en the role of the induction motor (efficiency) in this context is completed with some examples. The difference between motor and generator mode is discussed and explained based on measurement results of machines of different size and efficiency class. Special attention is paid to the behaviour and performance of induction machines supplied by unbalanced voltages. More specifically it is investigated if and how the susceptibility to voltage asymmetry is influenced by material choice, in which the main focus lies on copper rotor technology. Therefore, the different standards for the description and quantification of voltage unbalance are studied first. The theoretical discussion is backed-up with experimental results of several machines.

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Switched-reluctance motors are candidates for high-performance variable-speed drive applications. They are getting attention for uses that demand energy efficiency because of their relatively flat efficiency curve that can hit 90% over a broad range of operating conditions.

replicating a modified off-the-shelf motor, adding a Bedini-like circuit for improved efficiency, smoother running, and possible over-unity performance.

The true potential for saving energy involves a much bigger story, one that requires taking into account the entire power train. That’s because an energy efficient motor can reduce energy use by only 10%, even under optimum operating conditions. Far more important in saving significant amounts of energy are the use of electronic speed controls, which can reduce energy use by 30%, and optimizing mechanical systems, which can reduce energy use 60%.

The soleckshaw is basically motor-assisted bicycle that features a motor driven by a 36-volt battery recharged - or swapped - at a solar charging station. The soleckshaw can carry three passengers and can go about 12.5 miles per hour. Drivers can drive under their own power on flat roads, then switch on the motor to go up hills or give themselves a break when the load gets too heavy.