Effect of Frequency and Spatial-Harmonics on Rotary and Linear Induction Motor Characteristics

Stickler, John J.

doi:10.21949/1526658

i

Effect of Frequency and Spatial-Harmonics on Rotary and Linear Induction Motor Characteristics

1972-03-01
By Stickler, John J.

File Language:

English

Details

Creators:

Stickler, John J.
Corporate Creators:

John A. Volpe National Transportation Systems Center (U.S.)
Corporate Contributors:

United States. Urban Mass Transportation Administration
Subject/TRT Terms:
Publication/ Report Number:

DOT-TSC-UMTA-72-07
DOI:

https://doi.org/10.21949/1526658
Resource Type:

Tech Report
Geographical Coverage:

United States
Corporate Publisher:

United States. Urban Mass Transportation Administration
Abstract:

A computer analysis is made of the effect of current and MMF airgap harmonics on the output characteristics of rotary and linear induction motors. The current harmonics accompanying thyristor-control operation are evaluated by Fourier analyzing the primary current waveforms. The agreement between the computed harmonic amplitudes and those measured on an equivalent Wye-connected rotary induction motor is reasonably good. The calculated torque harmonics, which are generally small compared with the fundamental torque, tend to be maximum at unity motor slip and at large thyristor hold-off angles. The reduction in the output thrust of linear induction motors caused by end-effect waves is calculated for different values of circuit damping constant. The results indicate a considerable negative thrust contribution due to the end-effect waves in the region of small motor slip or synchronous speeds. A family of thrust-slip characteristics is presented for a typical linear induction motor illustrating the combined effect of frequency harmonics and spatial end-effect waves on the output performance of the motor.
Format:

PDF
Download URL:

https://rosap.ntl.bts.gov/view/dot/10175/dot_10175_DS1.pdf
File Type:

[PDF - 2.40 MB]
Collection(s):

Volpe Center
Main Document Checksum:

urn:sha256:feeeccc04986a2d7a1a40489bb5f4d15f8c0250a1f5fe3a8e364937bfe2d4315

File Language:

English

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