Basic Electrical and Electronics Engineering: Unit II: Electrical Machines
Double Field Revolving Theory
From the principle, ie any alternating quantity can be resolved into two quantities which rotate in opposite directions and have half of the magnitudes.
DOUBLE
FIELD REVOLVING THEORY
From
the principle, ie any alternating quantity can be resolved into two quantities
which rotate in opposite directions and have half of the magnitudes. The
alternating sinusoidal flux (ϕm) produced in the single phase
induction motor can be represented by two revolving fluxes, each equal to half
the value of (ϕm/2) the alternating flux and each Ns =
120ƒ/p in opposite directions by shown in fig 3.66.
The
vectors a and b have been rotated by an angle +Ɵ and -Ɵ is shown in fig 3.67.
The
resultant flux would be 2 × ϕm/2 × cos 2Ɵ/2
=
ϕm cos Ɵ
After
the quarter cycle of rotation that means Ɵ = 90°, fluxes a and b will be
oppositely directed as shown in fig 3.68.
Now
the resultant flux is zero.
After
the half cycle rotation, which meansƟ = 180°, fluxes a and b will have
resultant of -2 × ϕm/2 = -ϕm, is shown in fig 3.69
After
three quarter of a cycle, that is Ɵ = 270°, again the resultant flux is zero is
shown in fig 3.70.
Basic Electrical and Electronics Engineering: Unit II: Electrical Machines : Tag: : - Double Field Revolving Theory
Basic Electrical and Electronics Engineering: Unit II: Electrical Machines
Under Subject
Basic Electrical and Electronics Engineering
BE3251 2nd semester Mechanical Dept | 2021 Regulation | 2nd Semester Mechanical Dept 2021 Regulation
Basic Electrical and Electronics Engineering
BE3251 2nd Semester CSE Dept 2021 | Regulation | 2nd Semester CSE Dept 2021 Regulation
Related Subjects
Professional English II
HS3251 2nd Semester 2021 Regulation | 2nd Semester Common to all Dept 2021 Regulation
Statistics and Numerical Methods
MA3251 2nd Semester 2021 Regulation M2 Engineering Mathematics 2 | 2nd Semester Common to all Dept 2021 Regulation
Engineering Graphics
GE3251 eg 2nd semester | 2021 Regulation | 2nd Semester Common to all Dept 2021 Regulation
Physics for Electrical Engineering
PH3202 2nd Semester 2021 Regulation | 2nd Semester EEE Dept 2021 Regulation
Basic Civil and Mechanical Engineering
BE3255 2nd Semester 2021 Regulation | 2nd Semester EEE Dept 2021 Regulation
Electric Circuit Analysis
EE3251 2nd Semester 2021 Regulation | 2nd Semester EEE Dept 2021 Regulation
Physics for Electronics Engineering
PH3254 - Physics II - 2nd Semester - ECE Department - 2021 Regulation | 2nd Semester ECE Dept 2021 Regulation
Electrical and Instrumentation Engineering
BE3254 - 2nd Semester - ECE Dept - 2021 Regulation | 2nd Semester ECE Dept 2021 Regulation
Circuit Analysis
EC3251 - 2nd Semester - ECE Dept - 2021 Regulation | 2nd Semester ECE Dept 2021 Regulation
Materials Science
PH3251 2nd semester Mechanical Dept | 2021 Regulation | 2nd Semester Mechanical Dept 2021 Regulation
Basic Electrical and Electronics Engineering
BE3251 2nd semester Mechanical Dept | 2021 Regulation | 2nd Semester Mechanical Dept 2021 Regulation
Physics for Civil Engineering
PH3201 2021 Regulation | 2nd Semester Civil Dept 2021 Regulation
Basic Electrical, Electronics and Instrumentation Engineering
BE3252 2021 Regulation | 2nd Semester Civil Dept 2021 Regulation
Physics for Information Science
PH3256 2nd Semester CSE Dept | 2021 Regulation | 2nd Semester CSE Dept 2021 Regulation
Basic Electrical and Electronics Engineering
BE3251 2nd Semester CSE Dept 2021 | Regulation | 2nd Semester CSE Dept 2021 Regulation
Programming in C
CS3251 2nd Semester CSE Dept 2021 | Regulation | 2nd Semester CSE Dept 2021 Regulation