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EM Cheat Sheet (DRAFT) by

for em

This is a draft cheat sheet. It is a work in progress and is not finished yet.

Defini­tions

Reluctance = R; Force = F; Flux = ø; Flux Density = B; Induct = L; Electr­omotor Force = EMF;Cu­rrent = I; Flux Linkage = λ; Turns = N; Field intensity = H; field energy = wf; coenergy = wf'; Torque = T; short circuit ratio = SCR; unsat synchr­onous reactance = Xus; sat synch react = Xss; Line Voltage open circuit charac­ter­istic = Voc; Armature current short circuit test = Iasc; open circuit field current = AFNL; short ciruit field current = AFSC; unsat -> unsat motor region; sat -> saturated motor region.
 

Chapter 1 Equations

R
len/(u­c*ua*A)
F
N*I
I
Ftot/N
F
H*coreLen
ua
1.26*10-6Hm-1
F
ø*R
L
N2/Req
B
ø/A [T]
L
λ/i
Perm
1/Rtot
L
N2(u0)(Ag)/g