FAQs

Why is my motor overheating during normal operation?

Overheating may result from overload, poor ventilation, incorrect voltage, continuous stalling, or a failing bearing. Running with a capacitor that is too large can also cause excessive heat. Ensure the applied load is within rated torque and confirm the motor is receiving the correct supply voltage.

Why does my motor fail to start even though power is connected?

This issue is commonly caused by a faulty capacitor, insufficient voltage, overloaded load, or excessive friction in the mechanism. For single-phase motors, a degraded capacitor is the most frequent cause. Check the capacitor value, wiring correctness, and ensure the motor shaft can rotate freely without binding.

Why does the rotation direction sometimes change when using different gear ratios?

The output rotation direction of a gear motor depends on the internal gear train design. For certain ratios, the reducer output rotates in the same direction as the motor shaft; for others, the direction becomes reversed. When replacing or selecting a reducer with a new gear ratio, always check the rotation direction chart to avoid installation errors or unexpected motion in the application.

How can I determine whether a motor and a gearbox are compatible?

Miniature AC induction motors come with two types of shafts: round shafts and gear shafts. Only gear shafts can be assembled with gear reducers. Compatibility is confirmed when the motor model, gearbox model, outer dimensions, and gear shaft specifications match exactly. If assembly feels tight, gently rotate the reducer while fitting—never force the motor and gearbox together, as this may scratch gears or introduce metal debris, leading to noise and premature wear.

Can the speed of an AC induction motor be adjusted?

The speed of an AC induction motor is determined by the number of poles and the supply frequency. With fixed poles and frequency, the motor speed cannot be significantly changed. Voltage adjustments can slightly affect torque and speed, but the usable range is small. If voltage drops too low, torque becomes insufficient, causing overheating or stalling. To change motor speed, you should add a gear reducer or choose a variable-speed motor.

What is the purpose of a capacitor in a single-phase AC motor?

A capacitor has two major functions: (1) to shift the phase and create a rotating magnetic field, and (2) to generate the starting torque required for the motor to run in the intended direction. Without a capacitor, a single-phase motor may fail to start, start very slowly, or overheat. Using a capacitor that is too large can cause excessive heating and vibration, while an undersized capacitor will result in insufficient starting torque.

Do I need a planetary gearbox or a helical/worm gearbox for my application?

Planetary gearboxes are ideal for high precision, high torque density, and compact spaces (robotics, AGV, automation).
Helical gearboxes offer smooth operation and higher efficiency for continuous-duty industrial systems.
Worm gearboxes provide high reduction ratios and self-locking features for lifting and positioning.
NUODUN offers all three types and can help you choose based on load, accuracy needs, duty cycle, and budget.

How do I determine the proper torque and safety factor when selecting a reducer?

Calculate the required output torque based on load, inertia, starting conditions, and working environment. Then apply a safety factor (typically 1.5–2.5) depending on load stability and shock levels. NUODUN provides torque calculation support and can customize reducers for heavy-shock or high-precision applications.

What factors affect the performance and lifetime of a gearbox?

Key factors include material strength, gear accuracy grade, lubrication quality, heat dissipation, load conditions, and alignment between motor and reducer. NUODUN uses hardened gears, precision machining, optimized lubrication systems, and strict testing to ensure long-term reliability.

How do I select the right gearbox among so many models?

Start by clarifying four core parameters: required torque, speed ratio, input motor type, and mounting structure. You should also consider duty cycle, backlash level, and expected lifetime. NUODUN’s engineering team can evaluate your application and recommend the optimal gearbox to ensure efficiency and durability.

How do I choose the right Screw Jack model for my application?

To recommend the perfect solution, we need a few key details:

Load Capacity: The total weight to be lifted (dynamic and static).
Speed: How fast the load needs to move (mm/s).
Stroke Length: The distance the load needs to travel.
Duty Cycle: How frequently the jack will operate per hour/day.
Orientation: Vertical (up/down) or Horizontal. Answer: Provide these parameters to our engineering team, and we will calculate the torque and power requirements to select the optimal model.

Why should I choose NUODUN transmission products?

NUODUN combines custom engineering and system integration to deliver high-precision, high-reliability motion solutions. We provide structural customization, torque customization, special flanges, non-standard mounting, stroke customization, and fast delivery. Our products are widely proven in semiconductor, photovoltaic, automation, and heavy-industry applications.