The invention relates to a
copper alloy conducting bar and an end ring for a high-
power frequency-adjustable speed-adjustable asynchronous
traction motor and preparation methods thereof. The conducting bar is prepared by the processes of medium-frequency induction melting, semi-
continuous casting,
ingot homogenization, hot
extrusion, online
quenching, cold drawing, aging and
machining; and the end ring is prepared by the processes of medium-frequency induction melting, semi-
continuous casting,
ingot homogenization,
forging,
solid solution hardening, cold heading, aging and
machining. The
alloy of the conducting bar for a
traction motor of a rapid
train comprises the following components in percentage by weight: 9 to 12 percent of Zn, 0.3 to 1 percent of Cr, 0.05 to 0.3 percent of Zr and the balance of
copper and inevitable impurities, wherein the resistance Rho at 150 DEG C of the
alloy is kept at (5.00+ / -0.05)*10<-6>
ohm.cm, and at a test temperature of 350 DEG C, sb is more than or equal to 320MPa, s0.2 is more than or equal to 270 and d5 is more than or equal to 10 percent; the alloy of the conducting bar for the traction motors of subway and
light rail trains comprises the following components: 0.5 to 3 percent of Zn, 0.3 to 1 percent of Cr, 0.05 to 0.3 percent of Zr and the balance of
copper and inevitable impurities, wherein the resistance Rho at 150 DEG C of the alloy is kept at(3.45+ / -0.05)*10<-6>
ohm.cm, and at a test temperature of 350 DEG C, sb is more than or equal to 290MPa, S0.2 is more than or equal to 240MPa, and d5 is more than or equal to 12 percent; the
copper alloy of the end ring for the
traction motor comprises the following components: 0.3 to 1 percent of Cr, 0.05 to 0.3 percent of Zr and the balance of copper and inevitable impurities, wherein the resistance Rho at 150 DEG C of the
copper alloy is kept at (2.70+ / -0.05)*10<-6>
ohm.cm, and at a test temperature of 350 DEG C, sb is more than or equal to 260MPa, s0.2 is more than or equal to 220MPa.