Arwibon Q30 Rear Motor Inspection and Diagnosis Guide
When an Arwibon Q30 rear motor does not run, starts with shaking, loses power, makes abnormal internal noise, or shows a motor-related fault, the problem may come from the rear motor itself, the motor wiring, the Hall sensor circuit, or the controller.
One basic way to inspect the motor is to compare the mechanical resistance produced when different pairs of the motor's three phase terminals are electrically connected together.
This test does not require the scooter to be powered on. In fact, the battery must remain disconnected during the test.
The purpose is to compare the three phase paths inside the motor before deciding whether the rear motor needs further repair or replacement.
How the Rear Motor Phase Test Works
The Arwibon Q30 rear hub motor is a three-phase brushless motor.
For this test, the three motor phase terminals can be treated as:
- Phase 1
- Phase 2
- Phase 3
The three possible phase-pair combinations are:
- Phase 1 + Phase 2
- Phase 2 + Phase 3
- Phase 1 + Phase 3
When the rear wheel turns, the permanent magnets inside the hub motor move past the stator windings and generate electrical energy.
With the three phase wires left open, the generated current has no closed path through two phases, so the wheel is relatively easy to turn.
If two motor phase terminals are connected together, those two windings form a closed electrical path.
When you turn the wheel in this condition, current is generated through the connected windings. That current produces an opposing magnetic force inside the motor.
You feel this at the tire as increased resistance.
The wheel may feel noticeably harder to rotate and can produce a regular magnetic “jamming,” “cogging,” or braking sensation.
That increased resistance is the basic principle behind this inspection.
Why All Three Phase Combinations Must Be Tested
Testing only one pair does not tell you enough.
A three-phase motor has three phase paths, so each combination needs to be compared:
| Test | Phase Pair |
|---|---|
| Test 1 | 1 + 2 |
| Test 2 | 2 + 3 |
| Test 3 | 1 + 3 |
The important result is not simply whether the wheel becomes harder to turn.
What matters is whether all three combinations behave similarly.
For example, if:
- 1–2 produces strong regular resistance;
- 2–3 produces strong regular resistance;
- 1–3 produces strong regular resistance;
then the three phase circuits are behaving consistently in this basic test.
If two combinations produce strong resistance but the third combination produces almost none, there is a clear difference somewhere in the phase circuit shared by that abnormal test.
That can justify further inspection of the motor phase wire, terminal, connector, or internal winding.
What a Normal Motor Should Feel Like
With the motor disconnected from the controller and no phase terminals bridged, turn the rear wheel by hand first.
This is your baseline.
Then bridge two motor phase terminals.
The wheel should become noticeably harder to rotate.
The resistance should also feel reasonably regular as the wheel turns.
Repeat this with all three combinations.
A normal basic result looks like this:
| Phase Pair | Expected Basic Result |
|---|---|
| 1–2 | Clear magnetic resistance |
| 2–3 | Similar magnetic resistance |
| 1–3 | Similar magnetic resistance |
The exact amount of hand resistance does not need to be measured numerically for this test.
You are comparing the three combinations against each other.
What an Abnormal Result Means
If one phase pair feels completely different from the other two, first repeat the test.
Poor contact between the jumper and the recessed connector terminal can create a false result.
If the abnormal result repeats, inspect that phase circuit further.
Possible causes include:
- damaged motor phase wire;
- loose or recessed terminal;
- damaged connector;
- internal winding fault;
- another internal motor problem.
If all three tests feel similar, that does not automatically mean the controller is defective.
It only means this test has not found an obvious difference between the three motor phase paths.
Hall sensor problems, controller faults, throttle problems, brake cutoff signals, and wiring faults can still prevent the motor from operating.
Why This Test Cannot Fully Diagnose the Controller
This test is performed on the motor side with the controller disconnected.
It tells you about the behavior of the motor phase circuits when the wheel is rotated.
It does not test the controller MOSFETs under normal operating conditions.
It also does not directly test:
- Hall sensors;
- Hall sensor supply voltage;
- throttle signal;
- electronic brake cutoff;
- controller logic;
- controller power supply;
- motor behavior under load.
Therefore, the result should be used as one part of the diagnosis rather than as a direct “motor good = controller bad” rule.
Rear Motor Diagnostic Reference Table
| Test Result | What It Suggests | Next Check |
|---|---|---|
| All three phase pairs produce clear and similar magnetic resistance | The three phase circuits behave consistently in this basic test | Continue with Hall sensor, controller, throttle, brake cutoff, and wiring checks |
| One pair has little or no added resistance | Possible phase-wire, terminal, connector, or winding problem | Repeat the test, then inspect the related motor circuit |
| One pair feels much weaker than the other two | One phase path may not be behaving normally | Inspect phase wiring and motor terminals |
| Resistance is irregular and accompanied by abnormal internal noise | Possible electrical or mechanical motor problem | Inspect the motor and wiring further |
| Wheel already has strong drag before any terminals are bridged | Not the normal phase-short braking effect | Check brake drag, mechanical binding, cable damage, or internal motor condition |
| All three phase tests are similar but motor still will not run | No obvious phase difference found | Continue diagnosis rather than automatically replacing the motor or controller |
Detailed Arwibon Q30 Rear Motor Inspection Procedure
Once the theory is clear, you can perform the actual test.
Tools Needed
Prepare:
- U-shaped conductive jumper or short conductive wire
- Small stool or support stand
- Allen key
- Protective gloves
The scooter must remain powered off during the phase test.
1. Raise the Rear Wheel
Place the scooter securely on a stool or support stand.
The rear wheel needs to be completely off the ground.
Check that the scooter is stable before turning the motor wheel by hand.
The wheel should have enough clearance to rotate freely during all three tests.
2. Open the Battery Compartment
Remove the Arwibon Q30 battery cover.
This gives you access to:
- the battery;
- controller;
- motor wiring;
- main XT60 power connector.
Keep loose metal tools away from exposed electrical connections inside the deck.
3. Disconnect the XT60 Main Battery Plug
Locate the yellow XT60 connector between the battery and controller.
Disconnect it before touching the motor phase wiring.
Hold both plastic connector housings and pull them apart.
Do not pull directly on the wires.
Leave the XT60 connector disconnected until the complete phase inspection has finished.
4. Locate the Rear Motor Phase Connector
Follow the rear motor cable into the controller compartment.
Locate the yellow three-terminal high-current phase connector identified in the supplied procedure as the MT60 motor connector.
Disconnect the motor side from the controller side.
The shorting test is performed only on the connector leading to the rear motor.
Do not bridge the controller-side terminals.
5. Identify the Three Phase Contacts
Keep the motor connector in one fixed orientation.
For testing, identify the three contacts as:
- Contact 1
- Contact 2
- Contact 3
You will perform these three combinations:
- 1–2
- 2–3
- 1–3
Do not change the connector orientation halfway through the test.
6. Turn the Wheel Before Shorting Any Phases
Before inserting the jumper, rotate the rear wheel by hand.
Remember how freely it turns.
This is the open-phase baseline.
You need this comparison because the bridged phase tests should produce noticeably more resistance.
7. Test Contacts 1 and 2
Insert one end of the conductive jumper into Contact 1.
Insert the other end into Contact 2.
The wire needs to contact the metal terminal inside each connector cavity.
Do not assume the test is connected merely because the jumper has entered the plastic opening.
Turn the rear wheel by hand.
Pay attention to:
- how much harder it is to rotate;
- whether the resistance is regular;
- whether there is unusual noise;
- whether the resistance repeatedly disappears.
Record the result mentally or write it down.
Then remove the jumper.
8. Test Contacts 2 and 3
Move the jumper to Contacts 2 and 3.
Again, make sure both ends touch the metal terminals.
Turn the rear wheel using approximately the same hand force as during the first test.
Compare the result directly with the 1–2 test.
If both feel similar, record that.
If the second test is significantly weaker, stronger, or irregular, record the difference.
Remove the jumper again.
9. Test Contacts 1 and 3
Insert the jumper between Contacts 1 and 3.
Turn the wheel for the third time.
Compare this result with the previous two.
You should now have three results:
| Test | Your Result |
|---|---|
| 1–2 | |
| 2–3 | |
| 1–3 |
This simple table is useful when explaining the result to Arwibon after-sales support.
10. Compare the Three Results
Do not judge the motor from one test alone.
Compare all three.
If All Three Feel Similar
If all three pairs create a strong and reasonably similar magnetic braking effect, the three phase circuits are behaving consistently in this basic test.
An obvious open phase becomes less likely.
Continue checking the Hall sensor, controller, throttle circuit, brake cutoff, and related wiring if the rear motor still does not operate.
If One Pair Feels Much Weaker
Repeat that same combination first.
Make sure the jumper is contacting the metal terminals properly.
If the same phase pair repeatedly has little or no resistance while the other two feel normal, inspect the phase wiring and motor further.
If the Wheel Produces Irregular Mechanical Noise
Stop assuming the problem is purely electrical.
Check the motor, bearing area, brake system, cable routing, and internal motor condition.
11. Remove the Jumper Completely
Once all three tests are finished, remove the conductive wire from the motor connector.
Do not reconnect the motor while any two phase contacts remain bridged.
Check the connector carefully and make sure no conductive material has broken off inside it.
12. Inspect the Motor Connector
Look at the three phase contacts.
Check for:
- burned terminals;
- dark discoloration;
- loose contacts;
- terminals pushed backward;
- melted connector plastic;
- damaged cable insulation.
A damaged phase connector can cause symptoms similar to an internal motor fault.
13. Reconnect the Motor Phase Connector
Reconnect the motor-side phase plug to the controller-side connector.
Check that it is fully seated.
Do not leave the connector partially inserted.
14. Check the Hall Sensor Connector
If the phase test is normal but the motor still has a problem, locate the motor Hall sensor connector.
Inspect:
- connector seating;
- terminal position;
- locking tab;
- loose wires;
- dirt or moisture.
A Hall fault can cause starting vibration or failure even when the three motor phase paths appear normal in the shorting test.
15. Inspect the Motor Cable Near the Axle
Follow the rear motor cable back toward the wheel.
Check the section where the cable exits the motor axle.
This area is especially important.
Look for:
- cuts;
- crushed cable;
- severe bending;
- rubbing against the swingarm;
- contact with the tire;
- damage caused by an incorrectly positioned cable tie.
Damage in this area can affect both the phase wires and Hall sensor wires.
16. Check for Brake Drag
With the motor electrically restored but the scooter still powered off, spin the rear wheel.
If the brake disc continuously rubs heavily against the pads, the scooter may feel weak even when the motor itself is operating normally.
Correct obvious brake drag before diagnosing a “weak motor.”
17. Reconnect the XT60 Battery Plug Last
Only after:
- the jumper has been removed;
- the motor phase connector is restored;
- the Hall connector has been checked;
- exposed wiring has been inspected;
should the yellow XT60 battery connector be reconnected.
18. Perform an Elevated Motor Test
Keep the rear wheel off the ground.
Turn the Arwibon Q30 on.
Apply a small amount of throttle.
Watch and listen to the rear wheel.
Check whether:
- the motor starts immediately;
- it shakes during startup;
- it rotates in the expected direction;
- it cuts in and out;
- unusual noise remains.
If the motor still behaves abnormally, turn the scooter off before continuing diagnosis.
19. Check the Brake Cutoff
While the rear wheel is elevated, test the brake cutoff circuit.
Run the motor briefly at low throttle.
Operate the appropriate brake lever.
The motor drive should stop when the electronic brake cutoff is activated.
If the controller continuously sees a brake signal even after the lever is released, the motor may refuse to run despite having no obvious phase-winding fault.
Diagnosis After the Test
For actual troubleshooting, I recommend following this order:
| Order | Inspection | What You Are Trying to Rule Out |
|---|---|---|
| 1 | Rear wheel mechanical rotation | Brake drag or mechanical binding |
| 2 | 1–2 / 2–3 / 1–3 phase test | Obvious difference between motor phase circuits |
| 3 | Phase connector condition | Burned, loose, or recessed high-current terminals |
| 4 | Hall sensor connector | Missing or unstable rotor-position signal |
| 5 | Motor cable near axle | Internal wire damage from bending or abrasion |
| 6 | Brake cutoff | Controller being prevented from driving the motor |
| 7 | Throttle/control wiring | Missing acceleration command |
| 8 | Controller | Controller-side motor drive failure |
This sequence avoids replacing the rear motor or controller before the simpler wiring and signal problems have been checked.
Final Diagnostic Principle
The three-phase shorting test is useful because it gives you a quick mechanical comparison of the three phase paths without powering the motor.
The key is consistency.
Three similar results mean the basic phase behavior is consistent.
One clearly different result means that phase circuit deserves further inspection.
But the test should be treated as the first motor check, not the final diagnosis.
A complete Arwibon Q30 rear motor diagnosis should combine the phase-pair test with the Hall connector, motor cable, brake drag, throttle input, brake cutoff, and controller inspection.
