Hello,
optional intro, background information
After over a year of bargaining I was able to purchase an ebike with a broken battery (2011 - 3Element Espire). The battery and controller communicate over a proprietary canbus system. These bikes and their motor units were made in small numbers (german, expensive & overengineered) and both the bike and drive unit manufacturer have gone bankrupt. Unfortunately information is hard to find, even contacted people who were involved without success. In any case, the controller system is outdated, bulky and underpowered.
My plan is to use one of my own batteries (EM3EV 52V Super shark) and a new controller (currently considering the Grin Phaserunner V3). To correctly setup the phaserunner you apparently need some basic information on the motor, which sounds simple enough, yet has proven to be difficult. Before I purchase the controller, I want to be sure it is compatible and that I have a reasonble starting point to set it up.
The drive unit has a small BLDC motor (german made, CPM) and a three chain reduction system to bring the motor speed down to a comfortable cadence speed. Close to 1/48 reduction if I'm not mistaken. I've taken the drive unit apart to check the motor, but could not get it open to count the pole-pairs without damaging it (stripping bolts/screws). It took four hours to put the drive unit back toghether (three chains, gears, tension-system, bearings, etc.). It has a special 2-axis hall sensor mounted directly on top of the drive and I have no way to read the number of pole-pairs from this (not even sure you can). It also has a small 'gear' built in the system with some kind of metal-detection-sensor (just two wires) for the PAS system, will mostly go throttle only at first and just get it moving with the pedals before using throttle.
motor information
Manufacturer: CPM Motors (German), high quality motors
Tried to contact them for a datasheet but without luck so far
Type: BLDC - 3 phase
Output power: 1200W
Rated voltage: 48V
Rated speed: 3000RPM
Load current: I would assume around 25A
Hall sensor: Sentron 2SA-10 (2-axis sensor, mounted directly below drive shaft)
actual questions: number of pole-pairs of this motor
1. Anybody have any additional information on this specific motor?
2. What other methods could I use to try to identify the number of pole pairs?
3. For a motor like this, what is a likely guess (range) of pole-pairs?
-- I've looked for similar motors and most (that I could find) had either 4 or 5 pole pairs. I'm not sure if this is just normal for cheap motors or if this is normal.
optional intro, background information
After over a year of bargaining I was able to purchase an ebike with a broken battery (2011 - 3Element Espire). The battery and controller communicate over a proprietary canbus system. These bikes and their motor units were made in small numbers (german, expensive & overengineered) and both the bike and drive unit manufacturer have gone bankrupt. Unfortunately information is hard to find, even contacted people who were involved without success. In any case, the controller system is outdated, bulky and underpowered.
My plan is to use one of my own batteries (EM3EV 52V Super shark) and a new controller (currently considering the Grin Phaserunner V3). To correctly setup the phaserunner you apparently need some basic information on the motor, which sounds simple enough, yet has proven to be difficult. Before I purchase the controller, I want to be sure it is compatible and that I have a reasonble starting point to set it up.
The drive unit has a small BLDC motor (german made, CPM) and a three chain reduction system to bring the motor speed down to a comfortable cadence speed. Close to 1/48 reduction if I'm not mistaken. I've taken the drive unit apart to check the motor, but could not get it open to count the pole-pairs without damaging it (stripping bolts/screws). It took four hours to put the drive unit back toghether (three chains, gears, tension-system, bearings, etc.). It has a special 2-axis hall sensor mounted directly on top of the drive and I have no way to read the number of pole-pairs from this (not even sure you can). It also has a small 'gear' built in the system with some kind of metal-detection-sensor (just two wires) for the PAS system, will mostly go throttle only at first and just get it moving with the pedals before using throttle.
motor information
Manufacturer: CPM Motors (German), high quality motors
Tried to contact them for a datasheet but without luck so far
Type: BLDC - 3 phase
Output power: 1200W
Rated voltage: 48V
Rated speed: 3000RPM
Load current: I would assume around 25A
Hall sensor: Sentron 2SA-10 (2-axis sensor, mounted directly below drive shaft)
actual questions: number of pole-pairs of this motor
1. Anybody have any additional information on this specific motor?
2. What other methods could I use to try to identify the number of pole pairs?
3. For a motor like this, what is a likely guess (range) of pole-pairs?
-- I've looked for similar motors and most (that I could find) had either 4 or 5 pole pairs. I'm not sure if this is just normal for cheap motors or if this is normal.
