Search found 119 matches

by obcd
Feb 26 2020 5:06am
Forum: Motor Technology
Topic: TSDZ2 mid drive and 850C and SW102 displays only -- Flexible OpenSource firmware (Casainho code only)
Replies: 4593
Views: 321674

Re: TSDZ2 mid drive and 850C and SW102 displays only -- Flexible OpenSource firmware (Casainho code only)

The motor is not exactly very well thermally connected to the housing. So saying it doesn't warm due to the fact it doesn't feel warm seems a bit short trough the corner. Next there is the environmental temperature. The motor might overheat faster in summer when it's 30 deg C compared to 6 deg C in ...
by obcd
Feb 24 2020 10:24am
Forum: Motor Technology
Topic: Tsdz2 firmware open source adapted to vlcd5, vlcd6 and xh18
Replies: 817
Views: 83416

Re: Tsdz2 firmware open source adapted to vlcd5, vlcd6 and xh18

To get power from the motor, you need to feed it current. The osf firmware might be driving the motor a bit more efficient due to it using simplified foc, but the biggest boost likely comes from the fact that the motor current is less restricted and the software allows the motor to produce peaks of ...
by obcd
Feb 19 2020 4:20am
Forum: Motor Technology
Topic: Tsdz2 firmware open source adapted to vlcd5, vlcd6 and xh18
Replies: 817
Views: 83416

Re: Tsdz2 firmware open source adapted to vlcd5, vlcd6 and xh18

Isn't that what ebrakes are for? The brake lever closes a contact that turns off the motor.
by obcd
Feb 19 2020 4:16am
Forum: Motor Technology
Topic: Bafang SW102 Bluetooth LCD - OpenSource firmware and mobile app
Replies: 410
Views: 44042

Re: Bafang SW102 Bluetooth LCD - OpenSource firmware and mobile app

The open source firmware for SW102 is not compatible with the bafang motor. That motor display combination will only work with the original firmware. The open source firmware is for the tungsheng tsdz2 mid drive motor (also running on open source firmware) And, you need matching firmware versions or...
by obcd
Feb 19 2020 4:10am
Forum: Motor Technology
Topic: TSDZ2 mid drive and 850C and SW102 displays only -- Flexible OpenSource firmware (Casainho code only)
Replies: 4593
Views: 321674

Re: TSDZ2 mid drive and 850C and SW102 displays only -- Flexible OpenSource firmware (Casainho code only)

Maybe they saw the light and have implemented simplified foc in their firmware as well. With a bit of luck, they still use the same microcontroller. Or it could be that the old controller still works with the new motor. If it's mechanical more robust, that's a bonus. For the rest, we can only wait a...
by obcd
Feb 19 2020 3:59am
Forum: Battery Technology
Topic: Fast Charging - What is the secret?
Replies: 23
Views: 781

Re: Fast Charging - What is the secret?

The "ostrichoo julius" seems to use super capacitors as battery. Besides the fact they can charge in 30 minutes, they also seem to be less sensitive to temperature fluctuations. They also lower the possibility to set your house on fire and can be recharged 2000+ times. Their disadvantages at the mom...
by obcd
Feb 18 2020 5:34pm
Forum: Motor Technology
Topic: KT motor controllers -- Flexible OpenSource firmware for BMSBattery S/Kunteng KT motor controllers (0.25kW up to 5kW)
Replies: 3831
Views: 332204

Re: KT motor controllers -- Flexible OpenSource firmware for BMSBattery S/Kunteng KT motor controllers (0.25kW up to 5kW

http://www.mekacademy.com/ I am a bit confused here as the mounting of the planet wheels is rotating as well. If I remember well, in my front wheel geared hub motor, they are fixed to the axis and frame...? So, can't I just take the teeth ratio to figure out motor speed / wheel speed proportion? Sor...
by obcd
Feb 18 2020 5:20pm
Forum: Battery Technology
Topic: Fast Charging - What is the secret?
Replies: 23
Views: 781

Re: Fast Charging - What is the secret?

2022 is still 2 years away.
The e-bikes with super capacitors instead of lithium batteries are already on the market.
And a John Deere to go to work is a bit expensive.
by obcd
Feb 18 2020 5:17pm
Forum: Motor Technology
Topic: TSDZ2 mid drive and 850C and SW102 displays only -- Flexible OpenSource firmware (Casainho code only)
Replies: 4593
Views: 321674

Re: TSDZ2 mid drive and 850C and SW102 displays only -- Flexible OpenSource firmware (Casainho code only)

Doesn't the st-link boot as soon as it has gnd and 5V. (No idea, just thinking loud) Maybe someone can tell if you are suposed to measure a voltage on the swim line. If it should have some, you could measure it. If it's there it means the wires are making contact. Let's assume you have a motor that ...
by obcd
Feb 18 2020 5:03pm
Forum: Motor Technology
Topic: Tsdz2 firmware open source adapted to vlcd5, vlcd6 and xh18
Replies: 817
Views: 83416

Re: Tsdz2 firmware open source adapted to vlcd5, vlcd6 and xh18

The tutorial describes both stock firmware reprogramming and osf firmware programming. It's still unclear what you did. The eeprom (electrical erasable memory) is a piece of memory used to store parameters that don't need to be changed frequently. Those parameters remain in the memory when the power...
by obcd
Feb 18 2020 8:03am
Forum: Battery Technology
Topic: Lithium battery question
Replies: 74
Views: 2819

Re: Lithium battery question

A 20 Amps BMS will limit the current to 20 Amps. It usually does this by switching off the battery output voltage when there is 2 much current asked. Sometimes you need to connect a charger to the battery to bring a BMS that went into current protection back to life. So, you don't want it to go into...
by obcd
Feb 17 2020 10:36am
Forum: EV Business World
Topic: EV charging prices in Europe increase 500%
Replies: 13
Views: 407

Re: EV charging prices in Europe increase 500%

Our gouvernment stopped giving a fee to individuals who bought an EV. They claimed it wasn't used much anyhow. Companies are able to add such a car to their expenses for 120% the first 2 years and for 100% a couple more years. My boss drives electric, and it's surely not because he's worried about t...
by obcd
Feb 17 2020 9:14am
Forum: EV Business World
Topic: EV charging prices in Europe increase 500%
Replies: 13
Views: 407

Re: EV charging prices in Europe increase 500%

Most EV's are bought by companies. They are simply charged at the company during daytime. So the charging stations are not used enough to pay off for their investment. Solution: increase the price for a charge. People still using the charging station have no alternative as they clearly need some cha...
by obcd
Feb 17 2020 8:14am
Forum: Battery Technology
Topic: Fast Charging - What is the secret?
Replies: 23
Views: 781

Re: Fast Charging - What is the secret?

The first e-bikes using super capacitors as energy storage start to appear on the market. They can't beat lithium considering energy density, but it's sure something to keep an eye on. Those super capacitors can also charge very fast. I wouldn't be suprised if we will see hybrid batteries in the fut...
by obcd
Feb 17 2020 8:04am
Forum: Battery Technology
Topic: Lithium battery question
Replies: 74
Views: 2819

Re: Lithium battery question

Are you sure your cells can handle a 30 Amps discharge rate.
I seem to remember it's a 4P which means only 4 cells in parallel.
Assuming the cells are 2500mAh. If you pull 20A they will be empty after a 30 min. ride.
by obcd
Feb 17 2020 7:54am
Forum: Battery Technology
Topic: Bosch powertube repair
Replies: 5
Views: 188

Re: Bosch powertube repair

Bosch doesn't like it if you mess with their batteries. If you disconnect the cells from the bms or even disconnect one of the balance wires, the bms "shuts off" and refuses to restart afterwards. It needs some factory hocus pocus to come back to live. I have no idea if your packs are like that, but...
by obcd
Feb 14 2020 6:22pm
Forum: Motor Technology
Topic: TSDZ2 mid drive and 850C and SW102 displays only -- Flexible OpenSource firmware (Casainho code only)
Replies: 4593
Views: 321674

Re: TSDZ2 mid drive and 850C and SW102 displays only -- Flexible OpenSource firmware (Casainho code only)

Are you sure you can reflash the 850C with a CH340 based usb2ttl serial adapter? I was under the impression the flashing software only supported adapters with the CP2102 chipset. Besides appearing as a comport, some windows drivers have a "low level" way to access the usb2 serial bridge chip. Maybe ...
by obcd
Feb 13 2020 5:32pm
Forum: Motor Technology
Topic: TSDZ2 mid drive and 850C and SW102 displays only -- Flexible OpenSource firmware (Casainho code only)
Replies: 4593
Views: 321674

Re: TSDZ2 mid drive and 850C and SW102 displays only -- Flexible OpenSource firmware (Casainho code only)

They are not hugely overpriced as they only use quality cells and quality bluetooth bms boards. (At least that's what they claim to do) Do you want to pay a little more or constantly live with the fear they might set your house on fire one day? The battery still is the most expensive and important p...
by obcd
Feb 13 2020 11:35am
Forum: Motor Technology
Topic: TSDZ2 mid drive and 850C and SW102 displays only -- Flexible OpenSource firmware (Casainho code only)
Replies: 4593
Views: 321674

Re: TSDZ2 mid drive and 850C and SW102 displays only -- Flexible OpenSource firmware (Casainho code only)

60V and 16A makes 960W and will melt your motor unless you have a temperature sensor installed that automatically reduces the motor current.
by obcd
Feb 08 2020 6:29pm
Forum: Battery Technology
Topic: 4.1V 4s2p - bms with adjustable top and bottom cutoff
Replies: 29
Views: 1882

Re: 4.1V 4s2p - bms with adjustable top and bottom cutoff

A BMS should not only protect a battery against over charging, but also against over discharging. Finally, it should also protect the battery against over current. And, there are balancing BMS and non balancing BMS. IMHO, a bluetooth BMS is worth it's money as it allows to inspect the voltage of eve...
by obcd
Feb 08 2020 8:15am
Forum: Motor Technology
Topic: Tsdz2 firmware open source adapted to vlcd5, vlcd6 and xh18
Replies: 817
Views: 83416

Re: Tsdz2 firmware open source adapted to vlcd5, vlcd6 and xh18

The open source firmware uses "simplified FOC" to drive the motor. That should be more efficient than the standard firmware. The open source firmware has options to adjust maximum battery current and motor winding currents. This allows the motor to produce higher peak power when needed if the batter...
by obcd
Feb 03 2020 1:52pm
Forum: Battery Technology
Topic: Ebike battery charger
Replies: 22
Views: 770

Re: Ebike battery charger

I assume you try to avoid a BMS with this method. Let's not forget that a BMS also disconnects the battery if one of the cell group it's voltage becomes lower than the allowed treshold. Discharging lithium cells 2 much will damage them and will increase the risk of catching fire when you recharge th...
by obcd
Feb 03 2020 4:22am
Forum: Motor Technology
Topic: Bafang SW102 Bluetooth LCD - OpenSource firmware and mobile app
Replies: 410
Views: 44042

Re: Bafang SW102 Bluetooth LCD - OpenSource firmware and mobile app

I have no experience, but don't you have to press f instead of t for flashing?
by obcd
Jan 29 2020 1:03pm
Forum: E-Vehicles General Discussion
Topic: Get bucked by shorting old hub motor?
Replies: 23
Views: 1939

Re: Get bucked by shorting old hub motor?

A single phase short will work as a serious regenerative brake as the voltage generated in that phase will be shorted with only the wire resistance as current limiting factor. A motor with internal gearing that allows freewheeling is indeed the safest way to prevent injuries. I have seen a hub motor...
by obcd
Jan 29 2020 12:47pm
Forum: Motor Technology
Topic: Motor internal temp?
Replies: 5
Views: 292

Re: Motor internal temp?

I can't speak for inductance, but the magnetic strength of the magnets decreases at higher temperature. No idea if it's a temporary issue or a permanent issue that only happens above a certain temperature treshold.