Hiho, The information I have been able to gather suggests that it is simply more difficult to get torque out of a coreless motor than out of a similarly sized cored motor because the coreless motors tend to trap heat and thus overheat, and overheating is lethal to them. (The iron or steel core in a cored motor also makes a good heat sink, so motors intended for heavy duty and continuous operation tend not to be coreless.) However, the Pioneer Exclusive P3 (coreless) motor is second only to the Technics SP10 Mk3 motor in terms of torque among the TOTL Japanese DD's, as far as I can find out. (Perhaps the Denon DP100 motor develops more torque than that of the P3; don't know. It's as big as a coffee can, so I would not be surprised.) If you read about Kenwood's thinking in the design of the L07D, they actually did not favor high torque in principle. So they were not concerned with competing in that "horsepower" race. Also, the drive system (the implementation of the servo mechanism, use of a quartz reference, handling of the AC and/or DC, speed of the sensor mechanisms, etc) are also determinants of the success of a DD design; cored motors can be made to work just fine, IMO. The fact that Denon and Technics stuck with cored motors does not necessarily mean they were "stubborn". However, like you, I am not a motor engineer. Motors and how they work, what makes one better than another for this or that application, are fascinating and complex subjects.
Apropos of that, you cite the Brinkmann Bardo for using a coreless motor, and I did too in one of my earlier posts, but does anyone know about the Grand Prix Monaco, the NVS, or the Teres Certus? For that matter, what about the Brinnkmann Oasis?
Apropos of that, you cite the Brinkmann Bardo for using a coreless motor, and I did too in one of my earlier posts, but does anyone know about the Grand Prix Monaco, the NVS, or the Teres Certus? For that matter, what about the Brinnkmann Oasis?