looking for power wheel chair dc 24V motor power supply?

Thread Starter

LAOADAM

Joined Nov 21, 2018
879
Hi all.
Usually the power wheelchair motor used 24V dc motor and used Lead acid battery .
I am thinking if it is OK to use a thing like link below or even larger current say 100A to replace the SLA?

MOTOR:
https://www.aliexpress.com/item/1005003343776191.html?pdp_npi=2@dis!CAD!C$ 550.00!C$ 550.00!!!!!@2103245416834110633991636ea689!12000025321170005!btf&_t=pvid:76f5dd5d-295a-42b2-a715-53949060f38c&afTraceInfo=1005003343776191__pc__pcBridgePPC__xxxxxx__1683411063&spm=a2g0o.ppclist.product.mainProduct
DC MODULE:
https://www.aliexpress.com/item/1005002843829663.html?spm=a2g0o.cart.0.0.1b7238dahflNJe&mp=1

1500W 30A DC-DC Boost Module, in 10~60V Out 12~90V Boost Converter Step-up Module
can I use the picture below to build some thing as the circuit? what transformer should use?
or are there any better recommendation?

mm1.JPGmm4.JPGmm2.JPG

Thanks
Adam.
 
Last edited:

Thread Starter

LAOADAM

Joined Nov 21, 2018
879
Startup current might be a problem.
Range would be limited to the length of your mains cable!
Thanks.
It's true, startup current is a key point here, the running range is limited to a small area.
any solution?
Is Soft Startup Current Limiter OK to do some thing here? Or may be use battery start and then shift to cable power?
 

Tonyr1084

Joined Sep 24, 2015
7,905
A 450 watt 24 DC volt motor will draw 18.75 amps. I assume that's running draw. The motor is obviously geared down. If the load is heavy you can run close to that 450 watt draw. A 100 amp power supply appears to be overkill.

But I'm wondering even if you're using this in the home, that power cord is going to get snagged and pulled all the time, and may become a shock or fire hazard. That concerns me.

The whole idea behind having a high capacity battery is to have reserve power for extended periods of time. A power supply will only work when there's power supplied to the PS. During a power failure a person in a powered chair will be stranded. If they're not able to get up and walk they may find themselves in a precarious situation. Especially if the power is out because of a house fire. There may be no escape.

Be careful. Imagine the worst case possible and plan for double or triple protection against such.
 

Irving

Joined Jan 30, 2016
3,894
Wheelchair motors need a lot of current to start under load. Stall-current can easily exceed 200A per motor. In my chair they are current-limited by the controller to 120A for 15sec which is not uncommon when trying to start moving while the castors are at an angle on a soft surface. Running in a straight line at full speed on a smooth flat surface uses 10A typically.

I have 200Ah of LiFePO4 cells rather than SLA. More torque, longer life (10y/5000 charges v 18mo/500 charges), faster charging (50A v 8A)
 

Thread Starter

LAOADAM

Joined Nov 21, 2018
879
A 450 watt 24 DC volt motor will draw 18.75 amps. I assume that's running draw. The motor is obviously geared down. If the load is heavy you can run close to that 450 watt draw. A 100 amp power supply appears to be overkill.

But I'm wondering even if you're using this in the home, that power cord is going to get snagged and pulled all the time, and may become a shock or fire hazard. That concerns me.

The whole idea behind having a high capacity battery is to have reserve power for extended periods of time. A power supply will only work when there's power supplied to the PS. During a power failure a person in a powered chair will be stranded. If they're not able to get up and walk they may find themselves in a precarious situation. Especially if the power is out because of a house fire. There may be no escape.

Be careful. Imagine the worst case possible and plan for double or triple protection against such.
Thank you.
It's true, there are a lot of things need to be taken in mind.
They are using battery now, still lot of question.
If the cable supply power possible, I just need to balance them.

I'm wondering what's the Inrush current amps for a specific motor like the one above?
 

Thread Starter

LAOADAM

Joined Nov 21, 2018
879
Wheelchair motors need a lot of current to start under load. Stall-current can easily exceed 200A per motor. In my chair they are current-limited by the controller to 120A for 15sec which is not uncommon when trying to start moving while the castors are at an angle on a soft surface. Running in a straight line at full speed on a smooth flat surface uses 10A typically.

I have 200Ah of LiFePO4 cells rather than SLA. More torque, longer life (10y/5000 charges v 18mo/500 charges), faster charging (50A v 8A)
Thank you Irving.
I'll take in mind.
 
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