By Hans-Dieter Stoelting, Eberhard Kallenbach, Wolfgang Amrhein
Fractional-Horsepower drives are the most important for every kind of goods, from uncomplicated family utensils to most intricate technological purposes. This instruction manual supplies a pragmatic assessment at the on hand drives. It offers a entire reference approximately layout, performance, houses, and purposes of fractional horsepower drives and introduces into their regulate and the mechanical transducers. also, the ebook exhibits us avenues for projecting new drives. With first English variation of the bestselling German e-book, the writer deal with working towards engineers in addition to scholars of electric and mechanical engineering, regulate and mechatronics.
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Additional info for Handbook of fractional-horsepower drives
Motors with higher power use more poles and beneﬁt from lower cogging torque. The armature winding is usually carried out as a lap or wave winding. 8 shows the scheme of the winding with one coil for each layer. The number of coils is equal to the number of sections on the commutator. When using two coils for each layer, the number of sections on the commutator is twice the number of slots in the rotor. As the manufacturing of the windings is the most time consuming step in the production of a motor, the number of windings should be kept small.
The majority of commutator series motors have a stator lamination cross section as shown in Fig. 21a, independent of speciﬁc application purposes, operation parameters and design aspects. It is frequently referred to as universal motor lamination cross section. Due to the multitude of applications of these motors compared to other motor types, a much larger eﬀect of reducing material and production costs is achieved by speciﬁc modiﬁcations of the lamination cross section. An important aspect of cross section design is the width of the handle bar of a single-handed device.
A ﬂat design is shown in Fig. 4c, d. The bearing bracket is usually made of stamped steel and holds the bearing. Alternatively, injection moulding forms bearing brackets that allow integration of the brushes. The parts are assembled by welding, adhesive or caulking. High grade motors usually incorporate rare-earth or – with diminishing market share – AlNiCo magnets. 5a shows an example of a motor using AlNiCo magnets, Fig. 5b an example of a motor using rare-earth magnets. The latter shows the usage of a ﬂux concentrator for higher ﬂux density.