Electrical generator or motor structure – Dynamoelectric – Rotary
Reexamination Certificate
1998-11-10
2001-07-17
Tamai, Karl (Department: 2834)
Electrical generator or motor structure
Dynamoelectric
Rotary
C310S166000, C310S06800R, C318S701000
Reexamination Certificate
active
06262510
ABSTRACT:
The invention relates to a novel type of d.c. motor comprising wound magnetic yokes, wherein the rotating field driving the motor is effected by the electronic commutation of the windings of the magnetic yokes.
In contrast to the vast majority of electronically switched motor, the motor according to the invention requires no permanent magnets in order to generate a useful torque and, for that reason, is more inexpensive to manufacture than the normal motors of this type.
Such a motor is e.g. known from the prospectus of Messrs. TASC DRIVES LTD., United Kingdom. This motor possesses
8
stator poles and a six-pole rotor revolving in the interior of the stator. The magnetic flux which excites the rotor, proceeds via two oppositely Located poles and passes half of the stator circumference as well as the diameter of the rotor; it thus passes in considerable Length non-wound iron yokes, which merely cause Losses.
The DOS 2953032/79,
FIG.1
, shows a motor type possessing three wound stator yokes which are insulated from each other. Since the stator yokes are Located so as to be disposed at 120°, thus not oppositely disposed, strong radial forces act upon the rotor which result in a premature wear of the bearings.
The technical problem of the invention is to show several possibilities of how to construct some types of electronically switched motors and to offer generally applicable solutions both with regard to the magnetic circuit as well as regarding the commutation circuits with the object of obtaining inexpensive, light-weight motors subject to low losses.
The solution of the technical problem is achieved by means of the teaching of the main claim, while the constructional details are illustrated in the independent claims or in the drawings.
Below some general theoretical considerations:
The electronically switched reluctance motors according to the invention were for a long time considered to be inferior to the motors which are excited by means of permanent magnets because the magnetization energy of the poles does not come from permanent magnets, but every time the electromagnetic poles are to attract the rotor poles, this energy has to be supplied in an electrical manner. According to the teaching of the invention, this energy is cyclically recovered and transferred to the functionally following yoke because the self-inductance voltage Ua, which comes from the demagnetization energy of a yoke
11
Y, is transmitted in the form of premagnetization energy to the following yoke
11
X. On account of this, a saving in energy (a high degree of effectiveness) as well as a faster rise in the magnetic flux in these yokes is achieved which are approached by rotor poles moving away from the poles which have just been switched off.
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Three Abstracts entitled: Permanent Magnet Type Motor, Stator for Magnet DC Machine, and Two-Phase Reluctance-Type Semiconductor Motor; Nos. 63-11050 (A), 63-11051 (A), and 63-11052 (A); dated: Jan. 18, 1988; p. 159 E 623.
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Kelly Bauersfeld Lowry & Kelley LLP
Tamai Karl
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