Frequently Asked Questions

Motors and gearboxes tolerate weight better than drivers, connectors, or small accessories. Mixed export cartons need internal separation so dense hardware does not turn into impact energy against electronics in transit.

Use moisture control, clear carton labeling, and receiving-friendly line-item identification when the shipment combines several motion subassemblies.

• Bag and isolate electronics before they share a carton with motors or gearboxes.
• Use desiccant and sealed inner packaging for long transit lanes.
• Label each carton with the packed SKU mix rather than only the master shipment number.

For production release, the useful question is not only whether a family is compliant in principle. You need the exact declarations, material statements, and labeling support that match the shipped configuration and destination market.

This is especially important when the shipment mixes catalog parts, power supplies, or integrated assemblies that may trigger different file expectations.

• Request the declaration version, issue date, and covered SKU or assembly scope.
• Confirm whether RoHS, REACH, and any destination-specific labeling files are needed.
• Keep signed or audited documents linked to the final PO revision in the project record.

A catalog motor can look large enough until acceleration and reflected inertia are added. Start from the full motion requirement before you compare datasheet holding torque values.

Then leave margin for supply variation, heat, and the mismatch between a clean calculation and the real mechanism.

• Use running torque data at the real speed point, not only holding torque.
• Keep extra margin when the axis restarts under load or sees variable product weight.
• Re-check the motor after gearbox or screw selection changes the reflected inertia.

First-pass sizing equation

T_required = (J_total x alpha) + T_friction + T_process

Noise issues are usually wiring topology problems before they are mysterious firmware bugs. Mixed returns, parallel power and signal routing, and random shield termination points create most of the trouble.

Build one clean cabinet reference strategy first, then route high-current motor wiring and low-level feedback as separate systems with deliberate crossing points.

• Do not run encoder and motor phase wires in the same bundle unless the cable is designed for it.
• Keep shield strategy consistent across the full cabinet, not only one device.

Cabinet grounding sketch

PE chassis -> cabinet backplate
Driver 0V -> single star point
Motor cable shield -> cabinet entry clamp
Encoder shield -> controller end only

Most field problems start with current guessed from online examples rather than the motor data. Set the driver from the motor rating first, then measure case temperature and missed-step risk under real load.

Idle current should reduce heat without starving the axis during restart or holding conditions that still need torque.

• Change one variable at a time during commissioning.
• Thermal readings after 30 minutes are more useful than one quick bench check.

Practical first-pass setup

Peak current: 3.0 A
Idle current: 50%
Microstep: 1600 pulses/rev
Accel ramp: conservative first run

The usable inertia ratio depends on compliance, backlash, coupling stiffness, and the profile you actually plan to run. Published ratios are guidance, not a promise.

If the ratio climbs quickly, consider a gearbox, a different frame, or a slower move profile before assuming the controller alone will recover the margin.

• Treat 1:1 to 3:1 as a comfortable tuning zone for many catalog axes.
• Above 5:1, validate the full mechanism with realistic moves instead of relying on paper sizing only.

Starting catalog guideline

J_load / J_motor <= 5:1

Servo tuning can only correct what the feedback loop can still observe and influence. If the commanded move sits inside gearbox backlash, the load may not respond even though the motor shaft does.

This matters most on short indexing moves, reversal-heavy profiles, and inspection fixtures where direction changes are frequent and positional error cannot be averaged out over longer travel.

• Compare commanded move size with the gearbox deadband at the load.
• Watch reversal error, not only one-direction repeatability.
• Do not use aggressive gain to hide a mechanical gap that should be solved in hardware selection.

A BLDC drive that looks fine at nominal load can still trip on acceleration spikes, fast decel energy, or a power supply that collapses under multiple axes starting together.

For catalog-level planning, leave enough voltage and current margin to absorb worst-case motion events and confirm whether braking or regen handling is required upstream.

• Treat 15% to 20% electrical headroom as a starting rule, not a guarantee.
• Review supply recovery time if several axes share one bus.
• Check whether deceleration energy must be dissipated or redirected before finalizing the cabinet design.

Peak mechanical power estimate

P_peak = T_peak x omega_peak

Open-loop stepper is still the right first stop for many catalog axes, but closed-loop becomes attractive once recovery from a lost position is more expensive than the encoder and tuned driver.

Use it when the axis must keep a tighter error envelope, survive load variation, or report fault conditions during unattended operation.

• Choose open-loop first for cost-sensitive fixed loads.
• Move to closed-loop when the process cannot tolerate missed steps or manual re-homing.
• Validate the controller timing path before assuming encoder feedback alone solves the issue.

Microstep count mainly changes how the driver shapes phase current. If the axis is still exciting a structural resonance, the motor can remain noisy even at 16x or 32x microstepping.

Treat microstepping as one tuning lever, not a universal fix. Stable results usually come from matching current, acceleration, coupling stiffness, and supply headroom at the same time.

• Start at 8x or 16x before pushing higher divisions.
• Confirm the driver current against the motor nameplate instead of tuning only by sound.
• Check belt tension, coupling preload, and frame stiffness before blaming the motor.

Orders, addresses, wishlist items, and inquiry records are available through the account center after sign-in.

Yes. The catalog and support content are structured to help buyers navigate motors, drivers, power supplies, gearboxes, and custom motion combinations.

No. Standard catalog items and OEM projects follow different operational rules, which is why the storefront separates direct-buy and RFQ flows.

Include quantity, target market, delivery expectations, voltage or torque requirements, and any customization notes that affect feasibility.

Yes. The inquiry API supports guest submission, while signed-in users can later review inquiry history from the account center.

Each product detail page exposes the purchase mode. Direct-buy items show cart actions, while inquiry-mode items route into RFQ and support flows.

Torque margin is the buffer between the torque you expect to need and the torque the selected motor can actually provide at the operating speed.

It protects against load variation, supply sag, temperature rise, and the inevitable gap between a clean model and the real machine.

Protection index, usually discussed as an IP rating, describes how well an enclosure resists solid particles and water intrusion.

It is useful for product selection and compliance review, but it should not be confused with shipping protection or carton quality.

Microstepping divides each full step into smaller current-controlled increments to improve smoothness and commanded resolution.

It can reduce noise and improve feel, but it does not create unlimited real positioning accuracy if the mechanics and torque margin are weak.

Inertia ratio compares the reflected load seen by the motor with the motor inertia itself. Higher ratios generally make the axis harder to control cleanly.

It should be evaluated together with gearbox choice, backlash, stiffness, and the actual move profile rather than as an isolated number.

Holding torque is measured at zero speed and is useful for comparing static capability, but it is not the same as usable running torque at operating speed.

Sizing mistakes happen when holding torque is treated like a full-speed performance value without checking the real speed-torque curve.

Gear ratio describes how many motor turns produce one output turn. Increasing the ratio reduces output speed while multiplying available output torque.

The tradeoff includes backlash, efficiency loss, reflected inertia changes, and a different tuning feel at the load.

EMC grounding is the practical layout of protective earth, signal reference, and shield termination used to reduce conducted and radiated noise.

In motion systems, bad EMC practice often appears as encoder errors, random drive trips, or unstable digital inputs long before it is noticed on paper.

Duty cycle captures how long and how often the axis runs, holds, rests, or repeats a demanding move profile.

Average heating and power demand often depend more on duty cycle than on a single peak event, so it must be part of sizing and power planning.

Detent torque is the residual torque created by rotor magnet alignment when the stepper phases are not energized.

It contributes to low-speed feel and can interact with resonance or microstep smoothness, especially on light-load axes.

Closed-loop motion uses encoder or other feedback signals so the controller or drive can compare commanded motion with actual response.

It does not remove the need for correct mechanics or sizing, but it improves visibility into faults and can reduce the risk of silent position loss.

Bus voltage is the DC supply level feeding the drive stage. Higher voltage can improve speed capability and current regulation, but only if the full system remains inside safe electrical and thermal limits.

Poor bus stability shows up during acceleration, regeneration, or multi-axis startup when one supply must support several dynamic loads.

Backlash is the motion gap that appears when a drivetrain changes direction. The motor may move first while the load remains inside that deadband.

It matters most in indexing, short reversal moves, and inspection systems where directional repeatability matters as much as one-way accuracy.

Acceleration describes how quickly the axis changes speed. Higher acceleration raises the torque required from the motor and driver because inertia resists the speed change.

In sizing work, aggressive acceleration is often what turns a safe-looking axis into one that stalls, overheats, or demands a larger frame than expected.