Induction machine rotors with improved frequency response

A technology for induction motors and rotors, applied to asynchronous induction motors, electrical components, electromechanical devices, etc., to achieve the effects of reducing heat generation, improving transient response, and improving energy conversion efficiency

Inactive Publication Date: 2008-03-19
小威廉·B·达夫
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

Therefore, a near-constant output power characteristi...

Method used

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  • Induction machine rotors with improved frequency response
  • Induction machine rotors with improved frequency response
  • Induction machine rotors with improved frequency response

Examples

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Embodiment Construction

[0175] The rotor core and windings form an inductive circuit element. One or more capacitors may be added to the rotor to generally increase the power factor and thereby increase the power transfer and power conversion characteristics of the device. It is well known that capacitors and inductors can be combined in various LC configurations. These configurations may include series, parallel and mixed combinations of circuit elements.

[0176] When an induction motor is engaged, the rotor is generally stationary. At this moment, the stator and rotor are electromagnetically coupled to their maximum extent. Induction motors require a large magnetization VAR when engaged. As the rotor in an induction motor accelerates, the electrical frequency in the rotor decreases. To maintain a resonant or quasi-resonant circuit in the rotor as the rotor electrical frequency changes, a change in capacitance is required.

[0177] A simple LC rotor is shown in Figure 5, referred to as a serie...

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Abstract

The present invention generally relates to the use of electrical charge storage devices in the rotors of induction machines. Optimal induction machine rotor electrical field requirements increase with rotational velocity and inversely to frequency. Pseudocapacitance and other inverse frequency capacitance adjustment methods are employed to provide for that need and thereby improve induction machine rotor performance parameters. Optimization of electrical reactance is the foundation for improvements in power transfer, torque, efficiency, stability, thermodynamics, vibration, thermodynamics and bearing life in rotational induction machines. LC rotor methods and designs are outlined herein to achieve these objectives.

Description

[0001] (cross-reference to related application) [0002] This application claims priority to US Provisional Patent Application Serial No. 60 / 571975, entitled "INDUCTIONMACHINE ROTORS WITH IMPROVED FREQUENCYRESPONSE," filed May 18, 2004, which is incorporated herein by reference. technical field [0003] The present invention generally relates to the use of charge storage devices in rotors. In particular, the invention relates to charge storage devices, such as capacitors, in induction machine rotors for improved frequency response. Background technique [0004] The conversion of electrical energy into useful work consumes a large amount of electricity. It is therefore of great advantage to increase the operating parameters of their energy conversion mechanisms. The rotor is the end point of the electrical load in the conversion of electromagnetic energy into useful rotational work. So far, the frequency response of the rotor has faced great challenges and difficulties. ...

Claims

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Application Information

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IPC IPC(8): H02K17/16H02K17/22H02K17/42
Inventor 小威廉·B·达夫
Owner 小威廉·B·达夫
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