Abstract
A torque motor is a special electric motor that is able to develop the highest possible torque in a certain volume. A torque motor usually has a pancake configuration, and is directly jointed to a drive system (without a gear box). A limited angle torque motor is a torque motor that has no rotary electromagnetic field — in certain papers it is referred to as a linear electromagnet. The main intention of the authors for this paper is to present a means for analyzing and designing a limited angle torque motor only through the finite element method. Users nowadays require very high-performance limited angle torque motors with high density torque. It is therefore necessary to develop the highest possible torque in a relatively small volume. A way to design such motors is by using numerical methods based on the finite element method.
Highlights
A torque motor is a special electric motor that is able to develop the highest possible torque in a certain volume
Our purpose for this paper is to present some aspects of special torque motors with high torque density
In the situation of torque motors with a large air-gap, it is found that the magnetic field generates only the 4 main poles very accurately, because the field lines may not close in the neutral area of the poles directly between the magnets and the soft magnetic material of the rotor, due the dimensions of the air-gap
Summary
Our purpose for this paper is to present some aspects of special torque motors with high torque density. The authors of this paper have developed very special solutions for motors of this kind Some aspects of these solutions will be presented here. A limited torque motor is, usually, a toroidal motor relative to the winding solution In this way, the total air-gap, relative to the magnet, includes the winding. For motors with the winding assembled in slots, the value of the air-gap may be 0.4 mm to 1.5 mm, depending on the size of the motor and the arrangements for total friction torque. We will present some considerations on the small air-gap and large air-gap solutions
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