Induction rotor structure of a high-power and high-speed electromagnetic eddy current dynamometer
A technology of electromagnetic eddy current and rotor structure, applied in the direction of magnetic circuit shape/style/structure, instrument, power measurement, etc. Problems such as the maximum speed of the eddy current dynamometer, to achieve the effect of increasing the rated absorbed power, large braking torque, and expanding the area of the sensing area
Active Publication Date: 2017-02-22
INST OF ENGINEERING THERMOPHYSICS - CHINESE ACAD OF SCI
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Problems solved by technology
However, since the induction rotor of the existing electromagnetic eddy current dynamometer adopts a disk structure, in order to increase the rated absorbed power under the same excitation current, the diameter of the disk induction rotor needs to be increased, thereby limiting the electromagnetic eddy current The maximum speed of the dynamometer makes it unable to meet the dual needs of high power and high speed of power machinery
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[0019] As an implementation, for example, the wall thickness of the double-cup induction rotor cup is selected as s=6mm; the material of the induction rotor is TC11, and its allowable stress [σ]=6.64×10 8 Pa, density ρ=4.48×10 3 kg / m 3 , Resistivity γ=1.85×10 -6 Ω·m; the distance between the outer wall of the double-cup induction rotor and the inner wall of the stator armature core t = 3mm; coefficient A = 20. The design requires the maximum excitation current I = 12A, the maximum speed n max =18000rpm, rated absorbed power P t ≥3000kW.
[0020] by relation The maximum diameter D allowed by the outer wall of the double-cup induction rotor can be calculated max =379.5mm; by relation It can be calculated that the cup depth h of the double-cup induction rotor is greater than or equal to 107mm. As an implementation manner, the diameter of the outer wall of the double-cup induction rotor is D=300 mm, and the depth of the cup body h=150 mm.
[0021] The strength check res...
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Abstract
The invention relates to an induction rotor structure for a high-power and high-rotating speed electromagnetic eddy current dynamometer, and aims at improving the rated absorbing power and the maximal rotating speed of the electromagnetic eddy current dynamometer by expanding the area of a rotor induction zone under the premise of controlling the maximal outer diameter of an induction rotor. The induction rotor of the electromagnetic eddy current dynamometer provided by the invention is in a dual-cup body structure; the thicknesses of the walls of cup bodies of the dual-cup induction rotor are 4-7mm; the maximal dimensionless diameter (as shown in the specification) permitted by the outer wall surface of the dual-cup induction rotor, the dimensionless maximal rotating speed (as shown in the specification) of the electromagnetic eddy current dynamometer, the dimensionless allowable stress (as shown in the specification) of an inductor rotor material and dimensionless density (as shown in the specification) meet a relational expression as shown in the specification; the dimensionless cup body depth (as shown in the specification) of the double-cup induction rotor, the dimensionless rated absorbing power (as shown in the specification) of the electromagnetic eddy current dynamometer, dimensionless maximal exciting current (as shown in the specification) and the dimensionless electrical resistivity (as shown in the specification) of the induction rotor material meet a relational expression as shown in the specification; A is equal to 20-23; the double-cup induction rotor is located in rings of a stator armature iron core and an exciting winding; the distance from the outer wall surface of the double-cup induction rotor to the inner wall surface of the stator armature iron core is 2-3mm. The induction rotor structure provided by the invention is suitable for the occasions which require the electromagnetic eddy current dynamometer to simultaneously adapt to high power and high rotating speed.
Description
technical field [0001] The invention relates to the design field of electromagnetic eddy current dynamometers of power machinery, and is an induction rotor used to improve the rated absorbed power and maximum rotational speed of electromagnetic eddy current dynamometers, specifically, a high-power and high-speed electromagnetic eddy current dynamometer induction rotor structure. Background technique [0002] Electromagnetic eddy current dynamometer is a commonly used device for power measurement of power machinery. It has the characteristics of simple structure, fast dynamic response and stable operation. The main structure of the electromagnetic eddy current dynamometer includes the rotating shaft, the induction rotor, the stator armature core and the excitation winding. When the excitation winding is connected with DC, it will generate a no-load magnetic field around the excitation winding. When rotating, under the action of the no-load magnetic field, the induction rotor...
Claims
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IPC IPC(8): G01L3/24H02K1/22
Inventor 项效镕赵庆军李敬张彬彬雒伟伟
Owner INST OF ENGINEERING THERMOPHYSICS - CHINESE ACAD OF SCI
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