Motor getting verry hot.

[boisrondevens]

I have put a neugart ple80 in line with a scorpion.


The controller is a crystalyte 72v 60amps
The motor is a scorpion s5535

Specifications

Stator Diameter 55mm (2.165 in)
Stator Thickness 35mm (1.378 in)
No. of Stator Arms 18
Magnet Poles 20
Motor Wind 10 Turn Delta
Motor Wire 29-Strand 0.25mm
Motor Kv 190 RPM / Volt
No-Load Current (Io/10V) 1.56 Amps
Motor Resistance (Rm) 0.024 Ohms
Max Continuous Current 90 Amps
Max Continuous Power 3800 Watts
Weight 855.6 Grams (30.18 oz)
Outside Diameter 65.4 mm (2.575 in)
Shaft Diameter 7.98 mm (0.314 in)
Body Length 79.5 mm (3.120 in)
Overall Shaft Length 126 mm (4.96 in)
Max Lipo Cell 12s
Motor Timing 5deg
Drive Frequency 8kHz
Weight including packaging

1800g
Data Chart

View Scorpion S-5535-160KV Data Chart


I change the wires to wye to get 94 kv

The motor get verry hot in no time. I also use a optical sensor as u can se in the video.


Any idea y the heat?

View attachment 3

 

[Lebowski]

sensor timing not good...

 

[Miles]

How close is the motor casing to that chunk of aluminium alloy it's mounted in?

 

[boisrondevens]

Sensor timing: i set the sensor to the minimum amps draw from no load.
I'm getting 1.5amps at max speed on a 58v battery pack.
Casing: even without the casing is still getting hot.

Thanks!

 

[Lebowski]

check to make sure that you did the conversion to WYE correctly. The easiest is to drive the motor with a constant speed
(use a power drill) and measure the voltages between the three motor terminals with a multimeter set to AC.
You should get 3 the same values. If one is larger than the others (factor 1.5 to 2 larger), then the winding providing
the common terminal in two lower voltaged measurements should be reversed.

 

[fechter]

The no-load current sounds very reasonable. The timing has to be pretty good to get it that low.

If you are running the motor with no air flow, it will get hot pretty fast. I've always been surprised how hot motors get running at no load on the bench. When mounted on the bike and the bike is moving, the wind provides a lot of cooling.

You could try using a small fan aimed at the motor and see how it goes.

 

[boisrondevens]

Thanks guys ill try the connection to see if a
I have mistake with the wye connections.

Any input about how this kind of setup will do in the real world? I may have being the first to do this.

The motor shaft connected to gearbox with a 12t 32p pinion.
I really want to maximise the efficiency by not having the belt and pulley drive