QSMOTOR 3000W 138 70H electric bike mid drive motor kit assembly

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Quick Details
Brushless, Brushless DC Motor
> 400w, 3000W
Magnet height:
70mm, 40pcs, 5 pole pairs
Diameter of stator:
Rated Voltage:
72V as default
No-load rpm:
3800rpm without flux weakening, 6000RPM with flux weakening.
Max Torque:
56N.m without Reduction ratio, 223N.m with 1:4.77 Reduction ratio
Suggest peak phase current:
Thermic Probe:
None as default (KTY83/122 is available for mass production).
Supply Ability
Supply Ability:
1 Carton/Cartons per Month
Packaging & Delivery
Packaging Details
QS Standard Export Packing
1. Polyfoam + Carton Box
2. Or according to customer's requirements

QSMOTOR 3000W 138 70H electric bike mid drive motor kit assembly


For 138 3000W mid drive motor kit assembly, it could be used for electric scooter, electric motorcycle.

It could be 72V 90KPH, only avaiable for 12inch wheel kits (We might make bigger wheel & more powerful motor in near future.). 


Pictures show





QS Motor 3000W 138 70H Mid Drive Motor

Motor Type: BLDC Permanent Magnet Inner Rotor Motor With Hall Sensor

Brand: QS Motor,QSMOTOR

Motor Design: Single axle 

Matched Wheel: 12inch Wheel (as default)

Magnet Height: 70mm, 40pcs, 5 pole pairs

Diameter of stator: 138mm

Rated Power: 3000W (peak power, pending) 

Rated Voltage: 72V as default

Speed: 90KPH 

No-load rpm: 4400rpm without flux weakening, 6500RPM with flux weakening.

Max Torque: approx 56N.m (without Reduction ratio)

Reduction ratio: 1:4.7 (as default)

Max Efficiency: pending

Continuous Battery Current: pending (72V)

Peak Battery Current: 120A (72V)

Suggest Peak Phase Current: 450A

Thermic Probe: None (KTY83/122 is available for sample).

Working Temperature: pending

Single Hall Plate with waterproof connectors

16mm² Cross Section of Phase Wire (not include insulation layer)

Hall Sensor Phasing angle: 120 degree

Waterproof Grade: IP54

Color: Black 

N.W./G.W.: Pending   Package Dimension: Pending/piece  



VOTOL EM-150s, 24 MOSFET, 200A peak battery current, 470A peak phase current

PS. So far, the motor matching with controller.



The Kits include as below.

·1pc QS 3000W Mid Drive Motor with Left/Right fork 


·1pc Rear synchronous belt wheel 

·2pcs Decoration cover

·1pc Rear axle with screws

·2pcs Adapter

·1pc Synchronous belt

·1pc 12inch Aluminmun wheel

·1pc fender

·1pc Belt shield 

·1pc Belt side shield 

For the pakage, we will pack in two carton with wooden support.

70cm*39cm*25cm, 22.53kg

51cm*48cm*37.5cm, 12kg


For QSMOTOR 3000W mid drive motor kits (include controller, w/o tire or disc), USD 615.0/set (on-line).

If without controller, there will be USD 200.0 less.

For 3000W mid drive motor, it's USD 196.0/piece.

For Adelin Caliper with normal 220mm disc, USD 70.0/set.

For 220mm floating disc, there will be USD 24.0 more.

PS. Other controller might not easy to fit with our mid drive motor, we suggest to get controller sample for testing. 


 Performance Test

3000W 138 mid drive motor with  VOTOL EM-150 controller, 1:4.7 Reduction ratio









How to make the order

·Before-sale,  please advise which motor do you prefer, and advise above expected configuration of EV if possible.

After confirming motor, we could also advise suitable motor kits (e.g. controller).

It could be paid online, e.g. QS Motor Shop on alibaba, aliexpress;

We suggest to make the deal offline, we will make PI accordingly (latest price & accurate delivery cost).

·In-sale,  we will informe you once received the payment to start the order & ETD.

Before delivery, we will send some pictures for reference.

·After-sale,  Once got the tracking number, will informed you immediately.  

Manual and software will be sent accordingly, also we will email you after the package delivered.


Payment Term

Wire Transfer/TT, Money Gram,Western Union, Paypal 100% in advance(for sample) 
Generally, we perefer T/T, Money Gram,Western Union 100% in advance (for sample). 
Meanwhile, we could also accpet paypal. There will be extra cost for transaction fee: Total cost*4.4%+0.3

Withdraw fee: USD 35.0 (We could bear USD 35.0).
For Mass Production, we support 30% T/T in advance + 70% T/T the balance before shipment.

Produce Time

For normal motors, e.g. e-scooter motor, e-motorcycle, it takes 10-12 business days (6 business per week).
For customzide motor & single shaft motor, it takes 15-16 business days.
In busy season,  the order might be postponed. For mass production, the produce time will be increased accordingly.
PS. For the 3000W 205 50H V3 spoke hub motor, we made some 24*5T & 30*4T motor in store.

Standard export packing 1. polyfoam + carton box (for sample) 2. Or according to customer's requirements


Life Time of QS Motor & Warranty of Sample
The Life Time of motor depends on usage.
For general usage, it's about 3-5 years, and it could be 5-7 years if it work in good condition.
For testing and abusing usage, the lifetime will decrease accordingly.
E.g., For 3kW V2/V3 motor, the peak power could be 6kW (2 times of rated power).
Situation 1:
We suggest peak 70-80A battery current for general usage (72V). It's most stable configuration & longest life time.
Some EV enthusiast adjust it to be 150A, the output power is far more than 6kW peak. QS Motor could also work,

which might not as stable as former situation. For a long time in high current/power, the motor might over heat & even burnt.

We strongly suggest to install Thermic Probe (e.g. KTY 83/122), so that controller will protect motor due to the temp inside of motor.
Situation 2:
The peak speed of 1pc 3kW motor is 80KPH in 72V(for e-scooter).
Some EV enthusiast adjust it to be 96V, the max speed might be 100KPH, the continuous output power is far more than 3kW rated (maybe equal to 5-6kW).

QS Motor could also work, which might not as stable as it in 72V. 
We call it over voltage/abusing usage, the life time might be shorter, and V3 will work better than V2. 


Warranty period: one year and three months (sincethe date of manufacture) or after riding 15000KM.
For Sample, If it's destructive test/abusing usage due to test purpose, we could not do aftersale issue for free.

If there is some damage during your test, which we could repair. 
After checking your video or pictures, we could deliver some motor parts (e.g. hall sensor) for maintenance.
Also, you could deliver them back to our factory(I'm afraid that you have to bear delivery fee, both way), 
We will make maintenance as possible as we could. For repair fee, we could bear the cost for 1 year. 


QS Motor Manufacture

Certification: Business License, Patent Certificatie, ISO9001 Certificate,CCC Certificate, CE Certificate, Brand Certificate.




No QS Motor, No Super EVs!