What is the maximum swing angle used in the cable bending test?
For our current test equipment, the maximum swing range is limited to ±90°.
This means the cable can swing 90 degrees to one side of the center position and 90 degrees to the opposite side.
The ±90° value describes the capability of the test equipment used for this test. It should not be understood as a universal maximum angle for every magnetic charging cable or every industry test method.
A meaningful cable swing test needs more information than the angle alone.
What does ±90° mean in a swing test?
During testing, the magnetic connector or cable assembly is fixed at a defined position.
The cable then bends repeatedly around a specified point.
If the vertical position is defined as 0°, the fixture can move the cable toward one side and then toward the other side.
With our present equipment, the maximum test angle cannot exceed:
+90° / -90°
The complete movement therefore covers both sides of the center position.
When customers compare test reports, it is important to confirm how the angle is defined. Different fixtures may describe the same physical movement differently.
Is ±90° the maximum angle for every magnetic cable connector?
No.
The maximum angle of the connector itself and the maximum angle available on the test machine are two different things.
Our ±90° limitation comes from the mechanical range of the current swing-test equipment.
Another laboratory or test fixture may use a different angular range.
More importantly, increasing the angle does not automatically make a durability test more demanding or more useful.
Cable damage is affected by the complete test setup.
The bending point matters as much as the angle
A cable bent ±90° directly beside the connector may experience much greater strain than a cable bent through the same angle farther away from the connector.
This is particularly important for magnetic charging cables.
The transition between the connector body and cable is often one of the areas exposed to repeated mechanical stress.
Depending on the construction, this area may contain:
cable conductors
solder joints
strain-relief material
molded plastic
connector housing
PCB or internal terminals
If the fixture bends the cable too close to the termination, stress can concentrate in a very small area.
The test report should therefore define the bending position rather than giving only the swing angle.
Swing radius changes the test severity
Two tests can both use ±90° and still produce very different results.
If one fixture forces the cable around a small bending radius while another creates a larger, smoother curve, the stress on the cable conductors will not be the same.
A complete swing-test specification should therefore identify the fixture geometry and cable bending condition.
Without this information, comparing the cycle life of two cables based only on "±90°" can be misleading.
Test speed also affects the result
The speed of the swing movement needs to be controlled.
Very rapid movement can create different mechanical loads from slow bending.
It can also affect heat generation, impact at the end of travel, and the way the cable returns through the center position.
For production testing, the same speed should be maintained between samples so that the results are comparable.
When developing a custom magnetic cable, test speed should be agreed before testing begins.
Cable load needs to be specified
Some bending tests apply an additional weight or pulling force to the cable.
Others test the cable without an external load.
These are not equivalent conditions.
A hanging load can increase stress at the cable-to-connector transition and accelerate conductor fatigue.
For this reason, a test report should state whether an external load was applied.
If a customer provides its own test standard, we normally review the required angle, load, fixture position and cycle conditions before sample validation.
Why test magnetic connector cables for repeated swinging?
A charging cable rarely remains completely stationary during normal use.
Users pull it from the device, move the cable across a desk, place the product in a bag and repeatedly connect or disconnect the charging end.
Over time, this movement can stress the conductor and termination structure.
A swing test is used to reproduce repeated bending under controlled conditions.
The goal is not simply to see whether the outside of the cable breaks.
The electrical connection also needs to remain stable.
What can fail during a cable swing test?
Visible cable damage is only one possible failure.
Repeated bending can affect several parts of the assembly.
The copper conductor may gradually fatigue.
The conductor-to-terminal or conductor-to-PCB connection may also be stressed.
If the cable is overmolded, the transition between the flexible cable and rigid molded body may become a stress concentration point.
A cable can therefore look normal externally while its internal resistance has already changed.
Electrical testing should accompany visual inspection.
The magnetic connection should not carry cable strain
The magnets in a magnetic connector are intended mainly to align and retain the mating interface.
They should not be relied upon to absorb every pulling and bending force applied to the cable.
If cable movement constantly pulls directly against the magnetic interface, the connector may separate even though the cable itself remains undamaged.
The required magnetic retention force should therefore be considered together with:
cable weight
cable stiffness
pogo pin spring force
connector geometry
intended breakaway behavior
For some applications, easy magnetic separation is intentional. In others, more retention is required.
There is no single correct magnetic force for every cable.
Strain relief is important near the cable outlet
The cable exit from the connector body deserves particular attention during a swing test.
If a flexible cable exits directly from a rigid housing without a suitable transition, repeated bending can concentrate at almost the same point during every cycle.
A strain-relief structure can spread that movement over a larger section of cable.
Its length, hardness, wall thickness and shape can all affect bending behavior.
A very stiff strain relief is not automatically better.
If it simply moves the bending point farther down the cable and creates a new sharp transition, the failure location may only shift.
Cable conductor construction affects bending life
The internal conductor is another important factor.
For a flexible magnetic charging cable, conductor size and strand structure need to satisfy both electrical and mechanical requirements.
A larger conductor cross-section can reduce electrical resistance, but cable flexibility also depends on conductor construction, insulation and overall cable design.
High-current capability and bending durability therefore need to be considered together.
Selecting a cable only from its current requirement may produce an unnecessarily stiff assembly.
Electrical continuity should be monitored
For magnetic cables carrying power or signals, testing only after the final cycle can miss intermittent failures.
A conductor may temporarily disconnect during bending and then reconnect when the cable returns to its neutral position.
From the user's perspective, this can appear as charging interruption or unstable data transmission.
Where this type of failure matters, continuity can be monitored during the swing test.
This helps distinguish a cable that simply survives mechanically from one that maintains stable electrical performance throughout movement.
Contact resistance should also be checked
Repeated cable movement may affect solder joints, terminals and internal electrical connections.
For this reason, resistance measurements can be taken before and after the durability test.
If the magnetic connector uses pogo pins, the measurement method should also control the connector mating condition and pogo pin working compression.
Otherwise changes in the mating interface can be mistaken for cable conductor changes.
The magnetic mating surface should be kept stable during testing
If the objective is to test cable bending durability, the magnetic connector itself should normally remain in a controlled mating condition.
Repeated unintended separation can change the nature of the test.
In some projects, however, customers specifically want to evaluate both cable bending and magnetic retention.
These should be clearly defined as separate test requirements.
The fixture should reproduce the intended product use rather than combining several uncontrolled movements into one test.
How should a custom swing test be defined?
For a new magnetic charging cable project, useful test information includes:
swing angle
definition of 0°
bending position
bending radius or fixture geometry
swing speed
external load
number of cycles
cable length
electrical load during testing
continuity monitoring requirement
acceptance criteria
Our current equipment supports swing testing up to ±90°.
If a customer's standard requires an angle outside this equipment range, the test method needs to be reviewed separately rather than simply changing the value in the report.
Custom magnetic cable connector development
For a custom magnetic cable, mechanical durability should be considered during the connector-design stage.
Customers can provide product drawings, samples, cable specifications, electrical requirements and expected bending conditions.
The project can then evaluate the magnetic connector, pogo pins, cable, strain relief, housing and termination structure together.
Depending on the application, the magnetic connector can also be customized for pin quantity, current requirement, cable length, connector shape, magnet arrangement and PCB or wire termination.
The swing-test conditions should be agreed before qualification so that the sample result represents the customer's actual use rather than an arbitrary laboratory number.
FAQ
1. What is the maximum swing angle of your magnetic cable connector test?
With our current test equipment, the maximum swing angle is ±90°. This is an equipment limitation and should not be interpreted as a universal maximum value for all magnetic cable connectors.
2. Does a larger swing angle always mean a more demanding cable test?
No. Test severity also depends on the bending point, bending radius, applied load, speed and number of cycles. Two tests using the same ±90° angle can produce very different mechanical stress.
3. What should be checked during a magnetic cable swing test?
The test can evaluate cable appearance, conductor continuity, electrical resistance, termination integrity and movement around the strain-relief area. For sensitive applications, continuity can be monitored while the cable is moving.
4. Can a magnetic cable connector be customized for a customer's own bending-test standard?
Yes. The connector and cable structure can be developed according to the customer's drawings, samples and test requirements. The required angle, cycle count, load, test speed and acceptance criteria should be confirmed before sample testing. If the requested angle exceeds the capability of the available equipment, an alternative validation method needs to be agreed.
