KHB Series High- and Low-Temperature Stepper Motors | Used in Foldable Screen Testing

●Safe brake
●Encoder feedback
●Integrated stepper drives

Consumer electronics with foldable screens must undergo rigorous high- and low-temperature cyclic endurance testing to simulate real-world usage environments such as extreme cold in the Arctic and Antarctic, intense summer heat, and constant indoor temperatures. Testing equipment requires motors to maintain smooth operation, consistent angular positioning, and zero vibration even under rapid temperature changes. Conventional motors are susceptible to temperature-induced issues such as stuttering, torque fluctuations, and excessive backlash, which can easily cause damage to flexible screens and fail to meet precision testing requirements. The KHB Series High-Low Temperature Stepper Motors are specifically designed for flexible display testing equipment and are suitable for bend life testing of smartphones, tablets, and foldable devices. Thanks to their temperature stability, these high-low temperature stepper motors have become the mainstream drive components in the flexible screen testing industry. These high-temperature and low-temperature stepper motors operate within a temperature range of -60°C to +85°C, enabling low-temperature freeze-bending, high-temperature aging-bending, and thermal cycling tests. They utilize specialized structural materials that remain crack-free at low temperatures and distortion-free at high temperatures, eliminating mechanical backlash caused by temperature fluctuations.
With a torque range of 0.1–7.5 Nm, these motors deliver smooth and uniform torque output, preventing internal flex cable fractures caused by sudden impacts. Available with multiple flange sizes, they are compatible with both single-station and multi-station stacked folding testers. Equipped with high-precision position feedback modules, they precisely control bending angles, dwell times, and opening/closing speeds, ensuring consistent data for every bend. These motors can be optionally equipped with a safety brake that instantly locks during test pauses or power outages, preventing accidental bending and damage to flexible displays. To accommodate the limited installation space in testing equipment, the motors support custom shaft designs, including flat shafts, hollow shafts, and extended shafts, to fit specialized fixtures. In low-temperature refrigeration test chambers, these motors smoothly complete tens of thousands of folding cycles; in high-temperature constant-temperature aging chambers, they exhibit no overheating or loss of synchronization; and under thermal cycling conditions, their structure remains free of stress-induced deformation.
With an optimized internal damping structure, these motors operate with low noise and minimal vibration, preventing secondary damage to precision displays. Unlike general-purpose industrial motors, high-low temperature stepper motors are specifically calibrated for the high-frequency, gentle, and high-precision operating conditions of consumer electronics testing, capable of withstanding millions of uninterrupted folding cycles. With their excellent wide-temperature stability and precise control capabilities, these motors significantly improve the factory acceptance rate of foldable screen products and help consumer electronics companies pass rigorous environmental reliability verification.