The type of annealing to be discussed here is the final annealing of laminations punched from semiprocessed electrical sheets. Other types of annealing that enhance the quality of laminations are the stress relief annealing of laminations punched from fully processed electrical sheet and the annealing of hot band coils before cold rolling. Stress relief annealing is done to flatten laminations and to recrystallize the crystals damaged during punching.This damage extends from the punched edge to a distance from the edge equal to the sheet thickness, and it severely degrades the magnetic quality of the affected volume. In a small motor, this can be an appreciable percentage of the lamination teeth cross sectionB.ecause the teeth carry a very high flux density, punching damage can severely reduce small motor efficiency. The annealing of hot band coils is done in the producing steel mill on high-quality lamination sheet,primarily to enhance permeability.
FIGURE 2.3 B-H magnetization loops for 29G066 75-25% (29 06). Values based on ASTM 596 and A773; 75 percent parallel grain and 25 percent cross grain after annealing.
FIGURE 2.4 B-H magnetization loops for 29G066 100% (29 06). Values based on ASTM 596 and A773; 100 percent parallel grain after annealing.
FIGURE 2.5 B-H magnetization loops for 26N174, 26T214, 26T265, and 24T240. Typical values based on ASTM 596 and A773; half parallel and half cross grain after annealing.
FIGURE 2.6 29G066 75-25% (0.99 W/lb maximum 29 06). Typical values based on Epstein samples; 75 percent parallel grain and 25 percent cross grain at 60 Hz after annealing.
FIGURE 2.7 29G066 100% (0.66 W/lb maximum 29 06).Typical values based on Epstein samples; 100 percent parallel grain at 60 Hz after annealing.
FIGURE 2.8 29G066 (29 06), 29N145 (29 15), 26N174 (26 19), and 24N208 (24 19). Typical core loss values, W/lb, based on Epstein samples (ASTM A343); half parallel and half cross grain (except where noted) at 60 Hz after annealing.
FIGURE 2.9 26T214 (26 50), 26T265 (26 55), 24T284 (24 50), 24T352 (24 55), and 24T420 (24 56). Typical core loss values, W/lb, based on Epstein samples (ASTM A343); half parallel and half cross grain at 60 Hz after annealing.
FIGURE 2.10 24N208 (2.08 W/lb maximum 24 19). Typical magnetization curves based on Epstein samples; half parallel and half cross grain at 60 Hz after annealing.
FIGURE 2.11 24N218 (2.18 W/lb maximum 24 22). Typical magnetization curves based on
Epstein samples; half parallel and half cross grain at 60 Hz after annealing.
FIGURE 2.12 24N225 (2.25 W/lb maximum 24 27).Typical magnetization curves based on Epstein samples; half parallel and half cross grain at 60 Hz after annealing.
FIGURE 2.13 24N240 (2.40 W/lb maximum 24 36). Typical magnetization curves based on Epstein samples; half parallel and half cross grain at 60 Hz after annealing.
FIGURE 2.14 26N158 (1.58 W/lb maximum 26 14). Typical magnetization curves based on Epstein samples; half parallel and half cross grain at 60 Hz after annealing.
FIGURE 2.15 26N174 (1.74 W/lb maximum 26 19). Typical magnetization curves based on Epstein samples; half parallel and half cross grain at 60 Hz after annealing.
FIGURE 2.16 26N185 (1.85 W/lb maximum 26 22). Typical magnetization curves based on Epstein samples; half parallel and half cross grain at 60 Hz after annealing.
FIGURE 2.17 26N190 (1.90 W/lb maximum 26 27). Typical magnetization curves based on
Epstein samples; half parallel and half cross grain at 60 Hz after annealing.
FIGURE 2.18 26N205 (2.05 W/lb maximum 26 36). Typical magnetization curves based on Epstein samples; half parallel and half cross grain at 60 Hz after annealing.
FIGURE 2.19 29N145 (1.45 W/lb maximum 29 15). Typical magnetization curves based on
Epstein samples; half parallel and half cross grain at 60 Hz after annealing.
FIGURE 2.20 22T600 (6.00 W/lb maximum 22 56). Typical magnetization curves based on
Epstein samples; half parallel and half cross grain at 60 Hz after annealing.
FIGURE 2.21 23T500 (5.00 W/lb maximum 23 56). Typical magnetization curves based on
Epstein samples; half parallel and half cross grain at 60 Hz after annealing.
FIGURE 2.22 24T284 (2.84 W/lb maximum 24 50). Typical magnetization curves based on
Epstein samples; half parallel and half cross grain at 60 Hz after annealing.
FIGURE 2.23 24T352 (3.52 W/lb maximum 24 55). Typical magnetization curves based on Epstein samples; half parallel and half cross grain at 60 Hz after annealing.
FIGURE 2.24 24T420 (4.20 W/lb maximum 24 56). Typical magnetization curves based on Epstein samples; half parallel and half cross grain at 60 Hz after annealing.
FIGURE 2.25 26T214 (2.14 W/lb maximum 26 50). Typical magnetization curves based on Epstein samples; half parallel and half cross grain at 60 Hz after annealing.
FIGURE 2.26 26T265 (2.65 W/lb maximum 26 55). Typical magnetization curves based on Epstein samples; half parallel and half cross grain at 60 Hz after annealing.
FIGURE 2.27 26T330 (3.30 W/lb maximum 26 56). Typical magnetization curves based on Epstein samples; half parallel and half cross grain at 60 Hz after annealing.
FIGURE 2.28 Core loss versus frequency for 29G066 (29 06).
FIGURE 2.29 Exciting power versus frequency for 29G066 (29 06); 100 percent parallel grain.
FIGURE 2.30 Core loss versus frequency for 29G066 (29 06); 75 percent parallel grain and 25 percent cross grain.
FIGURE 2.31 Exciting power versus frequency for 29G066 (29 06); 75 percent parallel grain and 25 percent cross grain.
FIGURE 2.32 Core loss versus frequency for 26N174 (26 19); half parallel grain and half cross grain.
FIGURE 2.33 Exciting power versus frequency for 29G066 (29 06); half parallel grain and half cross g
rain.
FIGURE 2.34 Induction and permeability of vanadium permendur.
FIGURE 2.35 Core loss and apparent core loss of 0.006-in vanadium permendur.
FIGURE 2.36 Core loss and apparent core loss of 0.008-in vanadium permendur.
FIGURE 2.37 Core loss and apparent core loss of 0.010-in vanadium permendur.
FIGURE 2.38 Core loss and apparent core loss of 0.012-in vanadium permendur.
FIGURE 2.39 DC hysteresis loop for vanadium permendur.
FIGURE 2.40 Magnetization curves for armature grade (AISI M-43), metric units.
FIGURE 2.41 Magnetization curves for armature grade (AISI M-43), English units.
FIGURE 2.42 Magnetization curves for electrical grade (AISI M-36), metric units.
FIGURE 2.43 Magnetization curves for electrical grade (AISI M-36), English units.
FIGURE 2.44 Magnetization curves for dynamo grade (AISI M-27), metric units.
FIGURE 2.45 Magnetization curves for dynamo grade (AISI M-27), English units.
FIGURE 2.46 Magnetization curves for dynamo special grade (AISI M-22), metric units.
FIGURE 2.47 Magnetization curves for dynamo special grade (AISI M-22), English units.
FIGURE 2.48 Magnetization curves for super dynamo grade, metric units.
FIGURE 2.49 Magnetization curves for super dynamo grade, English units.
FIGURE 2.50 Magnetization curves for transformer C grade (AISI M-19), metric units.
FIGURE 2.51 Magnetization curves for transformer C grade (AISI M-19), English units.
FIGURE 2.52 Magnetization curves for transformer A grade (AISI M-15), metric units.
FIGURE 2.53 Magnetization curves for transformer A grade (AISI M-15), English units.
FIGURE 2.54 Core loss of 29-gauge silicon-iron electrical steels at 60 cps.
FIGURE 2.55 Core loss of 26-gauge silicon-iron electrical steels at 60 cps.
FIGURE 2.56 Core loss of 24-gauge silicon-iron electrical steels at 60 cps.
FIGURE 2.57 Core loss of 29-gauge silicon-iron electrical steels at 50 cps.
FIGURE 2.58 Core loss of 26-gauge silicon-iron electrical steels at 50 cps.
FIGURE 2.59 Core loss of 24-gauge silicon-iron electrical steels at 50 cps.