Ackerman Intelligent Car/Metal Chassis/Dual Encoder Motor/Front Wheel Servo Steering/ROS Robot

Hi Hiwonder team, Purchased this couple of weeks ago. Really impressed by the build quality and the ease with which I was able to set it up. Needed a clarification on the pulse per revolution of the rear wheel motors though. I am assuming that the rear wheel motors are JGB37-520R90-12 (https://www.hiwonder.com/products/hall-encoder-dc-geared-motor?variant=40451123675223&_pos=8&_sid=6abb2bcb1&_ss=r) The specification of those motors mentions that 'Number of magnetic ring lines' is 'Line 11'. I assume it means that the number of pulses per revolution should be 90 (gear ratio) * 11 = 990. However, when I manually rotated each wheel 10 times and counted the pulses, I got a pulse per revolution of around 1320. Did this independently for both motors and got the same figure. While it is not a big deal as I can just hardcode this value of 1320, I am curious what I might be doing wrong.

Based on the specifications of our 520 encoder DC gear motor and your test results, the issue lies in a misunderstanding of the pulse count calculation—specifically, overlooking the quadrature (4x) encoding feature of the AB-phase encoder. The detailed analysis is as follows:

Key motor specifications:

• Gear ratio: 1:30 (the motor rotates 30 times for every 1 rotation of the wheel)

• Magnetic ring resolution: 11 lines (the encoder outputs 11 base pulses per revolution)

• Encoder type: AB-phase (supports quadrature encoding, i.e., 4 pulses per line)

Correct pulse count calculation:
Pulses per wheel revolution = Gear ratio × Magnetic ring resolution × 4 (quadrature encoding)
i.e., 30 × 11 × 4 = 1320, which matches your measured result exactly.

Misunderstanding in your calculation:
The quadrature feature of the AB-phase encoder was overlooked—this feature increases the base pulse count by detecting both the rising and falling edges of channels A and B, effectively multiplying the base count by 4.
You either calculated only Gear ratio × Magnetic ring resolution (30 × 11 = 330), or mistakenly used a gear ratio of 90, both of which lead to incorrect results.

Conclusion:
The measured value of 1320 is correct. The root cause of the discrepancy is the omission of the quadrature decoding effect in the pulse calculation. The product parameters align with the actual test results, and there is no need to modify any hardcoded values.

Hi Hiwonder Team, I'm using Ackerman Intelligent Car/Metal Chassis/Dual Encoder Motor/Front Wheel Servo Steering/ROS Robo robot chassis for a university engineering project, and I need to know the exact type of aluminum alloy used in the chassis (e.g., 6061-T6, 5052, etc.) for material analysis. Could you please confirm the alloy type and let me know if it's anodized or treated in any way? Thanks in advance for your help!

Hello, the Ackermann chassis is constructed from 5052 aluminum alloy with an anodized surface treatment for enhanced durability.

can I use an Arduino nano with this motor controller as I'm limited for space on my vehicle, thanks for your time.

Yes, you can use it with the Arduino Nano. However, please note that we only provide a use case for the Arduino UNO, not the Arduino Nano.

If I use an Arduino with this does that mean I need to keep two separate batteries charged? If I use Raspberry Pi would it only require one battery? Thanks.

The wiring and power supply setup should be determined by the customer based on the main controller they are using. The wiring diagrams provided in our documentation can be used as a reference.

The diagrams for Arduino and Raspberry Pi illustrate separate power supply connections for both the motor driver module and the main controller. You can access the diagrams here: https://drive.google.com/drive/folders/1O4BKZvg1j5O4--Iso-XlFvE_lz6UkY1M?usp=sharing

Is there any spring system for shock absorbing to prevent the motor damage on longer use? I've seen leaf springs in some customized designs.

Sorry, it doesn't have; It features Ackermann steering structure

I purchased the Ackerman Chassis through Amazon. The chassis looks great, but it does not have any software. There was a business size card with a QR code that was suppose to lead to the software. However, the google file folder for the chassis was empty. Where do I go to get the software? I don't even have a driver for the motor module. Thanks

Please access the tutorials in this link: https://drive.google.com/drive/folders/1Jcs9PcTw3cJdfZzUECddxVQQZ6stYKqJ?usp=sharing

Does your Ackerman Chassis come with the motor driver and any software?

Yes, Ackerman Chassis comes with a motor driver

Does the robot chassis include the motor drive module?

Yes