![hpevs ac 50 motor hpevs ac 50 motor](https://i.ebayimg.com/images/g/gbIAAOSwqpNglCyN/s-l300.jpg)
Recent examination of the SEW Eurodrive online catalog suggests that demand for two pole machines may in fact be disappearing from the industrial landscape above 3 Hp. Meanwhile the outside diameter of the stator remains at the same size as the equivalent horsepower 4-pole stator, the reason is unclear however the longer magnetic paths of the 2-pole probably do benefit from the larger back iron of the stator available with its rotor core being that much smaller. This kind of makes sense since the machine needs only to develop half the torque since it is rotating at twice the speed.
![hpevs ac 50 motor hpevs ac 50 motor](http://www.evworks.com.au/assets/alt_2/MOT-HPE-AC50.jpg)
In an attempt to reason why this is so Weber went on to note that the rotor of an equivalent horsepower 2-pole machine is of smaller diameter - about 70% - from examination of quoted rotor inertia values as found in manufacturers catalogs. But Woody and others have compared Tmax or breakdown torque, which has nothing to do with cooling and they still show that 4-poles have nearly twice the peak torque of same-frame-size similar-mass 2-poles." "My experience is that I noticed 2 pole (machines) are smaller perhaps because hi-speed fan cooling (at 3000rpm) allowed designers to downsize slightly" I wrote the following on 2nd OCT 2012 on the "14000rpm machines" thread regarding 2-pole and 4-pole stators. This exact idea has been discussed here just recently. AEVA is probably a more neutral site for advising against the re-use of 2- pole machines. On your site I noticed that you had chosen a 2-pole as a candidate for a rewind. and is direct drive- so I need all three- Good starting torque, good top end torque AND sufficient top RPM for street driving.)Īn AC motor used as a traction drive and using our Curtis controllers need to be always wound in Delta, because Wye would be too soft on torque at the voltages this controller maxes out at.about 90 or so. The very first motor winding with 2 turns per pole was the best "street" motor, but required a transmission due to the 3,100 RPM top speed (My car weighs 1,900 Lbs. Yes, this can be played with giving different driving characteristics, but at the end of the day, it is the overall driving experience that counts. The third motor has a 1,400 RPM base speed. The second winding had a 2,400 RPM base weakening speed. The first motor winding had a base weakening speed of 770 RPM (as recommended by the controller). It is a changeable parameter as is the RPM point where the weakening starts and the curve as to how aggressively it happens. Top end torque is increased by weakening the field in the stator. More windings=better bottom end torque but earlier saturation and lower top RPM. But, is limited by the saturation of the stator. Motor RPM is determined by the frequency only. The voltage/current relationship is fixed by whatever the controller "sees" during the Auto-run portion of the initial optimization routing performed when a new motor is installed to the controller. : ) The Curtis controller has no voltage parameter settings that can be changed. It will be a couple three weeks or so before we can get it done. We are expecting it to strengthen the bottom end torque, keep a decent cruising current draw and still raise the top RPMs to maybe 4,500 or so.
![hpevs ac 50 motor hpevs ac 50 motor](https://falconelectric.co.uk/wp-content/uploads/2018/11/ac-50-26.26-2.jpg)
wires and go three times around each pole, but skip 2 slots per pole. It will use 1/9th the slots worth of 18 Ga.
![hpevs ac 50 motor hpevs ac 50 motor](https://stealthev.com/wp-content/uploads/2019/06/AC-50-top.jpg)
We have figured out another winding pattern for a fourth try. It too softened the bottom end torque some, but extended the top RPM to 3,800 and lowered the current under cruise to an acceptable rate between the other two tries. wires, but we are skipping 2 slots on each pole. It is back to 1/6th of the slot worth of 18 Ga. We currently have the third generation winding in the motor. It moved the torque up some and softened the initial take off some, but extended the RPMs up to 4,100, but it was at the cost of increased current draw under a cruise.
#HPEVS AC 50 MOTOR FULL#
The second winding was a full 1/3rd of the slot worth of 18 Ga. wires and wound two times around each pole, times the three phases filled the slot. This winding used 1/6th the slot worth of 18 Ga. It had great bottom end torque, a decent current draw under cruise, but was limited to 3,100RPMs. I have been kind of remiss in my posting lately.