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Electric machines

A current and armature winding technology, applied in the direction of synchronous machines, electromechanical devices, electrical components, etc., can solve problems such as not having advantages

Inactive Publication Date: 2002-09-11
BLACK & DECKER INC +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

However, none of these prior art arrangements has the advantages of the arrangement in WO98 / 05112

Method used

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Embodiment Construction

[0019] Embodiments of the invention will be described below with reference to a flux-switching motor having a four-pole stator and a two-pole rotor, wherein the stator has a field winding 10 and an armature winding 11 divided into two coils 24 and 25, these The coils are tightly coupled and wound such that diametrically opposed portions of the coils are located in diametrically opposed stator slots. For further explanation, the two armature coils are referred to as A 1 and A 2 .

[0020] In the circuit of FIG. 5, field winding 10 is connected in parallel with armature coils 24 and 25 and capacitor 57 so that the currents through field winding 10 and armature coils 24 and 25 are different. Powering the circuit from an AC source 58 by means of a rectifier bridge 59, the switch control circuit 60 alternately powers the armature coils 24 and 25 to provide magnetomotive forces acting in opposite directions for motor rotation. In this case, the circuit arrangement has two switche...

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Abstract

An electrical motor or generator comprises a rotor 79 without windings, a stator 78 having armature windings comprising at least two coils A1, A2 having active portions positioned within armature winding slots 81 in a stator iron, and field windings F having active portions positioned within field winding slots 80 in the stator iron. An electronic control circuit is provided for controlling the currents in the coils A1, A2 in synchronism with rotation of the rotor such that periods in which a magnetomotive force is generated in one direction by current flow in one of the coils alternate with periods in which a magnetomotive force is generated in the opposite direction by current flow in another of the coils. The armature winding slots and the field winding slots are equal in number and alternate with one another in the stator iron. Furthermore, considering the width of each slot 80, 81 as being the maximum extent of the slot in the direction of rotation of the rotor and considering the depth of each slot as being the maximum extent of the slot radially of the rotor and the thickness of the back iron behind the slot as being the distance between the maximum extent of the slot and the maximum extent of the armature iron along the same radial direction, the width of each armature slot 81 is greater than the width of each field winding slot 80 and the thickness of the back iron behind each armature winding slot 81 is greater than the thickness of the back iron behind each field winding slot 80. Such an arrangement optimises the power efficiency whilst making best use of the magnetic material.

Description

technical field [0001] The present invention relates to electric machines. Background technique [0002] Figure 1a and 1b Represents a traditional two-phase variable reluctance motor, which includes a stator 2 with two pairs of salient poles 3, 4 facing inwardly, the salient poles are provided with two pairs of excitation windings 5, 6 corresponding to two phases, the The motor also includes a rotor 7 with a single pair of salient poles 8 facing outwards without winding. Each of the four excitation windings is wound on its corresponding magnetic pole, for example, the symbol Y-Y represents the two radially opposite parts of each winding in the winding pair 6, and the symbol X-X represents the two diameters of each winding in the winding pair 5. to the opposite part. A field circuit (not shown) is used to cause the rotor 7 to rotate within the stator 2 by alternately exciting the stator synchronously with the rotation of the rotor so as to take advantage of the tendency o...

Claims

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Application Information

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IPC IPC(8): H02K1/06H02K1/16H02K3/28H02K19/10
CPCH02K1/165H02K1/246H02K19/103
Inventor 李查德·T·瓦尔特
Owner BLACK & DECKER INC
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