Most of the prototype copper rotors die-cast during the ICA/CDA project were produced using intensification pressures and solidification times in the ranges listed in Table 11.3.1.

Parameter	Motor Size	Values
Intensification Pressure	Fractional	400 – 600 bar
	>1 kW	750 – 920 bar
Solidification Range	All	12 – 18 seconds

Table 11.3.1: Values of intensification pressures and solidification times used to die-cast copper rotors

Experience with the smaller rotors showed that high values of intensification pressure could actually deform the lamination slots, leading to increases in stray load losses and difficulty with assembly. Therefore, lower intensification pressures were used with the smaller rotors.

<< back  |  next >>