Keyword: Electric motors

Briefs: Motion Control

The linear motor was invented in the mid-nineteenth century, at much the same time as its brother, the rotating electric motor. Because the linear motor always has to effect a reversing movement -...

Briefs: Software
Program Simulates Performance of a Hybrid Automobile

The Hybrid Electric Vehicle Analysis (HEVA) computer program numerically simulates the performance of an automotive vehicle -- especially a hybrid vehicle. A vehicle is said to be hybrid if (1) it contains an energy-storage device (a battery, flywheel, or ultra-capacitor) that is charged with...

Briefs: Mechanical & Fluid Systems

Magnetostatic switches — switches that open or close in response to magnetic fields — are being developed and fabricated using micromachining (MEMS) technology. These switches operate similarly to...

Briefs: Materials
Muscle Wires for Planetary-Exploration Robots

A report proposes the use of muscle wires as mechanical actuators for planetary-exploration robots. Muscle wires are commercially available in kit form in the hobby market, and have been described (though not explicitly called "muscle wires") in previous articles in NASA Tech Briefs. A muscle wire...

Briefs: Manufacturing & Prototyping

The need for improved investment castings at Marshall Space Flight Center's Rapid Prototyping Lab has led to the development of a simple machine for centrifugal investment casting of shells....

Briefs: Motion Control

An improved motor controller provides a circuit that will allow a motor to run at full speed while traveling from point A to point B, and still be able to obtain the desired damping...

Briefs: Mechanical & Fluid Systems

A Stirling cooler is a mechanical system that approximates the ideal gas cycle. Often associated with airborne or portable cooling applications that require compact design and low input power,...