Electrical generator or motor structure – Dynamoelectric – Rotary
Patent
1991-02-25
1992-05-26
Stephan, Steven L.
Electrical generator or motor structure
Dynamoelectric
Rotary
310154, 310254, 310261, H02K 124, H02K 112
Patent
active
051171449
DESCRIPTION:
BRIEF SUMMARY
The present invention relates to an electric motor which is of the kind defined in the preamble of claim 1 and which can be supplied with current and its speed controlled by a simple electronic circuit and which has a single, pre-determined direction of rotation. The invention also relates to an appropriate electronic supply and control arrangement for use with such a motor.
There are several very wide areas of use in which electric motors need rotate only in one direction. Such areas include the drive motors of fans, pumps, centrifuges compressors and different domestic electrical appliances, and also many other usages. It would be highly beneficial in the case of many of these electric motor drives to be able to vary the speed of the motor in a controllable manner and/or to be able to achieve higher speeds than those available with the use of commutator-equipped universal motors or induction motors supplied directly from the mains.
This requires, however, a motor with which the supply of current is controlled electronically, hereinafter referred to as an electronic motor. With a few exceptions, present day electronic motors are intended to include electronically reversible rotation, which as before mentioned is not required in several, very wide areas in which such motors are used, and consequently electronic motors have not been used in many extensive fields of use, for reasons of economy. The major part of the costs of present day electronic motors, for instance, induction motors to which current is supplied via frequency converters, lies in the supply electronics. The main components of the frequency converter, e.g. the power transistors, are responsible for a highly significant part of these costs. FIG. 1 of the accompanying drawings illustrates a conventional and quite common embodiment of the inverter part of a frequency converter intended for controlling electronically the supply of electric current to an induction motor having, for instance, a power range of 0.5-2.5 kW. This inverter contains no less than six MOSFET-type transistors with associated drive circuits, and twelve rapid diods. Consequently, in order to reduce radically the costs of an electric motor that has electronically controlled power supply facilities, it is necessary to lower radically the cost of the supply electronics. In other words, it is necessary to use much simpler electronics containing fewer components.
Accordingly, an object of this invention is to provide an electric motor which will enable the supply of power thereto to be controlled electronically with the aid of much simpler supply electronics containing far less components than present day known electronic motors.
This object is achieved with an electronic motor constructed in accordance with the present invention and having the essential characteristic features set forth in claim 1. Advantageous further developments and embodiments of the inventive motor have the characteristic features set forth in claims 2-12. Distinct from the majority of present day known electronic motors, the inventive electronic motor is not constructed for electronic reversible rotation, but will only rotate in one pre-determined direction. This pre-determined direction can only be changed by mechanical modification of the motor. As before mentioned, this will have no importance in the large majority of fields in which such motor are used. claim 13 defines the characteristic features of an electronic supply circuit intended for a motor constructed in accordance with the invention.
The invention will now be described in more detail with reference to the accompanying drawings, in which
FIG. 1 illustrates the aforedescribed construction of the inverter used in a frequency converter of the type generally used in present day electronic motors;
FIG. 2 is a schematic and principle end view of an exemplifying first embodiment of an electric motor constructed in accordance with the invention;
FIG. 3 is a spread sheet which illustrates schematically the configuration and arrangement of the stator p
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Nguyen Matthew
Stephan Steven L.
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