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Cogging torque of electrical motors is the torque due to the interaction between the permanent magnets of the rotor and the stator slots of a permanent magnet machine. It is also known as detent or no-current torque. This torque is position dependent and its periodicity per revolution depends on the number of magnetic poles and the number of ...
A detent is a mechanical or magnetic means to resist or arrest the movement of a mechanical device. [1] Such a device can be anything ranging from a simple metal pin to a machine. The term is also used for the method involved. Magnetic detents are most often used to divide a shaft rotation into discrete increments.
Today, torque is referred to using different vocabulary depending on geographical location and field of study. This article follows the definition used in US physics in its usage of the word torque. [5] In the UK and in US mechanical engineering, torque is referred to as moment of force, usually shortened to moment. [6]
An over-torque condition pushes the balls out of their detents, thereby decoupling the shaft. It can have single or multiple detent positions, or a snap acting spring which requires a manual reset. There may be a compression adjustment to adjust the torque limit. Many cordless drills incorporate this type of torque limiter in a planetary ...
Torque density is a measure of the torque-carrying capability of a mechanical component. It is the ratio of torque capability to volume and is expressed in units of torque per volume . Torque density is a system property since it depends on the design of each element of the component being examined and their interconnection.
It would be great to have some specific examples of use of the various types of torque limiter. For instance, I'm pretty sure the torque limiter in my electric screwdriver is of the ball detent type (because of the sound it makes when limiting), but I'd like to have it confirmed by someone who's taken a screwdriver like this apart and also knows what a ball detent torque limiter looks like...
The previous equations for planar motion can be used here: corollaries of momentum, angular momentum etc. can immediately follow by applying the above definitions. For any object moving in any path in a plane, = = ^ the following general results apply to the particle.
Radiant energy of the electromagnetic spectrum with wavelengths in the visible, near-ultraviolet, and near-infrared spectra, the broadest definition of which includes all radiation with a wavelength between 0.1 μm and 5.0 μm. Schrödinger equation A mathematical equation which describes the time evolution of wave functions in quantum mechanics.