2026.09.23 | AC | Robotics | Japan Harmonic Reducer Procurement

摘要

The following insights are provided by esteemed industry experts:

1. In terms of supply chain strategy, several overseas robot brands have transitioned from exclusively using Harmonic

Drive to a dual-sourcing model of "Harmonic Drive + leading domestic suppliers."

1. The validation process across the "Big Four" covers five stages: ① preliminary documentation review, ② standalone

test bench performance evaluation, ③ single-joint integrated co-commissioning, ④ full-robot accelerated life and durability testing, and ⑤ small-batch pilot production plus field operating condition verification.

1. This shift is primarily driven by downstream cost-down pressures, as well as notable performance improvements across

domestic brands.

1. What changes have taken place in how the "Big Four" industrial robot manufacturers select harmonic reducer brands?

In terms of supply chain strategy, several overseas robot makers have shifted from relying solely on Harmonic Drive to adopting a dual-sourcing strategy combining Harmonic Drive with leading domestic suppliers, such as Leader Harmonious Drive Systems or LAIFUAL. This transition is particularly pronounced at KUKA and ABB, whereas Yaskawa and Fanuc have moved at a relatively slower pace.

Prior to 2023, the Big Four sourced almost 100% of their reducers from foreign suppliers and did not use domestic brands. Beginning in 2025, they broadly initiated qualification and certification for domestic brands, generally implementing a dual supply chain setup anchored by Harmonic Drive and Nidec-Shimpo, with domestic suppliers serving as secondary sources.

Moving into 2026, domestic brands such as Leader Harmonious Drive Systems and LAIFUAL have seen their penetration rise rapidly across local Chinese plants, while qualification processes for overseas facilities are now underway. Yaskawa still does not use domestic reducers in its core Yaskawa-branded robots; however, it has fully adopted domestic harmonic reducers across its sub-brands and collaborative third-party ventures, such as Tianji Robot (a joint venture with Shenzhen Everwin Precision Technology) and semiconductor equipment developed with Guangchuan.

1. How exactly do the Big Four validate domestic harmonic reducers?

Complete validation process (standardized onboarding framework of the Big Four):

① Preliminary documentation review

Review materials, tooth profiles, factory accuracy, patents, IATF16949 quality certifications, and third-party test reports; verify the compatibility of flexspline steel, bearings, and grease; screen for potential patent infringement risks.

② Standalone test bench performance evaluation (laboratory static and dynamic testing)

Conduct static and dynamic lab tests benchmarked directly against Harmonic Drive samples, strictly enforcing thresholds for performance degradation.

③ Single-joint integrated co-commissioning

Integrate reducers with proprietary servo motors, encoders, and brakes to evaluate bandwidth, jitter, position drift, temperature rise, and thermal coupling behavior.

④ Full-robot accelerated life and durability testing (core barrier to entry)

Run continuous operation tests—10,000 hours for KUKA and at least 8,000 hours for Fanuc and Yaskawa—tracking degradation in accuracy, torsional rigidity, and operational noise throughout the trial.

⑤ Small-batch pilot production plus field operating condition verification

Deploy batches of 50 to 200 units across automotive, 3C, and semiconductor production lines for 6 to 12 months of trial operation; commercial volume supply is approved only if zero batch-level failures occur.

1. What specific sub-items are tested during harmonic reducer validation by the Big Four?

① Accuracy metrics: Backlash must be ≤1 arcmin for industrial robots and ≤0.5 arcmin for humanoid and collaborative robots. Peak transmission error must be within ±30 arcsec. Evaluations also track thermal accuracy drift under extreme temperatures, deflection under lateral loads, and repeatability.

② Mechanical load capacity: Map torsional stiffness curves across the entire operational envelope; calibrate rated torque, shock torque limits, radial and axial rigidity, and backdrive resistance; verify zero plastic deformation under short-duration 5x shock loads.

③ Efficiency and environmental reliability: Rated operating efficiency must reach 75% to 82%, with full-load casing temperature rise remaining ≤85°C after 72 hours. Operating noise must not exceed 58 dB, and units must pass high/low temperature, damp heat, salt spray, and 1-million-cycle start-stop impact tests.

④ Durability and failure validation: Industrial models require an L10 bearing and gear life of at least 10,000 hours, with strict caps on post-durability accuracy and stiffness loss. Testing includes 2x rated torque accelerated fatigue and ultimate overload destruction tests to align with system-level safety margins.

1. What is the current harmonic reducer supplier breakdown across each of the Big Four?

The supplier breakdown by brand is as follows: For Fanuc's globally manufactured units, 90% use Harmonic Drive and 10% use Nidec-Shimpo, with zero domestic Chinese brands deployed so far. For products built locally in China—such as Shanghai-produced collaborative and SCARA robots—Harmonic Drive accounts for 70% and Leader Harmonious Drive Systems supplies 30%.

For Yaskawa's domestic Japanese production, 92% is sourced from Harmonic Drive and 8% from Nidec-Shimpo. At its Chinese factories, Harmonic Drive holds 75% and Leader Harmonious Drive Systems accounts for 25%.

For ABB's European plants, 80% comes from Harmonic Drive and 20% from Slovakian supplier Spinea. At its Shanghai Baoshan facility, Harmonic Drive accounts for 55% and Leader Harmonious Drive Systems supplies 45%.

At KUKA, influenced by Midea Group Co., Ltd's controlling ownership, its German plants source 85% from Harmonic Drive and 15% from Nidec-Shimpo.

1. Have the Big Four considered developing harmonic reducers in-house? Why or why not?

Current procurement strategies across the brands:

① Fanuc and Yaskawa: Both outsource harmonic reducers to Harmonic Drive and only maintain in-house capacity for RV reducers, operating no harmonic reducer production lines. Yaskawa's joint ventures focus purely on localizing RV units.

② ABB: Sources from Wittenstein in Europe and North America and Harmonic Drive in Asia; ABB has now introduced domestic Chinese reducers while continuing its policy of outsourcing transmission components.

③ KUKA: Historically relied 100% on Harmonic Drive, began adopting Midea's Giya Precision Machinery in volume in 2022, and builds no proprietary harmonic reducer lines.

Reasons the Big Four avoid in-house development:

① High capital intensity and steep technical barriers: R&D in flexspline metallurgy, precision machining, and proprietary tooth geometries requires hundreds of millions of yuan, carrying payback cycles of 8 to 10 years. Robot OEMs prefer allocating resources to servos, controllers, and software algorithms.

② Better cost economics via merchant sourcing: Specialized suppliers dilute unit costs through massive production scale. Developing in-house solely for internal consumption yields weak margins.

③ Extensive patent thickets: Harmonic Drive controls vast portfolios of core foundational patents, exposing in-house R&D to substantial infringement risks. External sourcing sidesteps IP exposure.

④ Supply chain diversification: Partnering with both Japanese and domestic vendors mitigates risks, ensuring delivery schedules are not compromised by internal ramp-up or yield issues.

1. What factors prompted the Big Four to shift from shunning domestic brands to actively evaluating them?

This transition has been driven by several key factors. Foremost is cost reduction demand from downstream end customers, who now place cost-effectiveness ahead of legacy brand prestige and pure performance. Rather than mandating specific foreign component brands, clients increasingly require robot makers to optimize configurations within strict target cost budgets.

In addition, the performance of domestic brands has improved significantly, earning market credibility and greater willingness among end users to run production trials.

1. What is the long-term outlook for domestic component penetration across the Big Four?

Looking ahead, the share of domestic brands is expected to rise steadily. Robot manufacturers must cultivate localized supply ecosystems over time to safeguard supply chain resilience. If demand surges and incumbent vendors such as Harmonic Drive or Nidec-Shimpo face delivery bottlenecks, manufacturers can readily allocate orders to qualified domestic suppliers. As a result, domestic penetration will be a progressive, long-term ramp.

1. What are the typical pricing bands and actual discount levels for Japanese-branded harmonic reducers?

Pricing for Japanese harmonic reducers has remained relatively stable, varying by size and brand. These represent list prices; actual transaction prices reflect widespread discounts, typically ranging from 20% to 32% off list (procured at 68% to 80% of list price) depending on order volume, vendor relationship, and specific account terms. A nominal 30% discount closely reflects prevailing transaction levels.

1. What were Yaskawa's global and domestic robot sales volumes in 1H 2026, and how much harmonic reducer demand did that

create?

Between March and August 2026 (the first half of Yaskawa's fiscal year), Yaskawa shipped 42,000 robot units globally, up 16% YoY. Its Changzhou plant shipped 17,800 units, up 26.3% YoY. Global shipments and domestic Chinese shipments are tracked separately; Yaskawa's total volume reached 59,800 units across both operations. These figures cover only Yaskawa-branded systems, excluding joint-venture output.

Assuming an average requirement of 3.2 harmonic reducers per robot, the 42,000 global units generated demand for approximately 134,400 harmonic reducers, with Harmonic Drive taking a 92% share (around 123,600 units) and Nidec-Shimpo taking 8% (around 10,800 units). The 17,800 units produced at the Changzhou plant generated demand for roughly 57,000 reducers, with Harmonic Drive supplying 75% (approx. 42,800 units) and Leader Harmonious Drive Systems supplying 25% (approx. 14,200 units).

1. What drove Yaskawa Robot's growth in 1H 2026, and what is the outlook for the second half?

Growth in the first half was primarily driven by major account wins across two key sectors: new energy vehicles and AI hardware. In the AI vertical, the primary customer was Victory Giant Technology; in the NEV space, Yaskawa captured orders from BYD, Great Wall Motor, and Chery. Furthermore, business with Foxconn is beginning to contribute volume; Foxconn plans to procure 8,000 robots across 2026, which is currently in an initial small-batch phase with nearly 100 units already delivered.

Looking ahead to the second half (Yaskawa's fiscal second half begins in September), order intake tracking against the Chinese calendar remains favorable. Shipments in the domestic Chinese market are expected to maintain a growth trajectory comparable to the first half.

1. What are Yaskawa's major joint ventures in China, and where do they stand regarding harmonic reducer localization?

Yaskawa's primary high-volume joint ventures in China are Tianji Robot and Guangchuan Robot. The harmonic reducer figures mentioned earlier cover both the Changzhou factory and OEM production for Tianji Robot. Guangchuan Robot primarily manufactures specialized automation for the semiconductor industry; because its downstream semiconductor customers are Tier-1 players that insist on established global component brands, the volume of domestic harmonic reducers used is negligible. Over the next two to three years, domestic harmonic reducers are unlikely to gain substantial traction in the semiconductor robotics segment without explicit policy incentives. Other ventures, such as Ruixiang (with Chery), currently post modest unit volumes.

1. What was the consumption of harmonic reducers at Yaskawa's Changzhou facility in 1H 2026, what were the supplier

allocations, and how will shares shift going forward?

In 1H 2026, Yaskawa's Changzhou facility (including contract assembly for its Tianji Robot JV) consumed roughly 57,000 harmonic reducers. Harmonic Drive supplied 42,800 units, while Leader Harmonious Drive Systems supplied 14,200 units. Leader Harmonious Drive Systems was formally qualified only in 2025, but its allocation is expanding rapidly in 2026 because Harmonic Drive faces lead times of 4 to 6 months on incremental orders, creating tight supply bottlenecks.

For 2027, the tentative plan is to rebalance allocations toward a 40/60 split, with Leader Harmonious Drive Systems taking 40% and Harmonic Drive retaining 60%.

1. Why does Yaskawa intend to cap Leader Harmonious Drive Systems' share at approximately 40%?

Yaskawa plans to stabilize Leader Harmonious Drive Systems' allocation at roughly 40% without further aggressive expansion. This cap reflects product segmentation: Leader Harmonious Drive Systems is deployed primarily in small-payload models, whereas mid-to-large-payload robots—which carry higher brand equity for Yaskawa—will continue using Harmonic Drive units exclusively.

1. Will other domestic brands, such as LAIFUAL, be onboarded in the future?

Regarding additional domestic vendors, Tianji Robot is currently conducting qualification tests on LAIFUAL, with sourcing decisions contingent on validation milestones. Test data indicates that LAIFUAL delivers approximately 95% of Leader Harmonious Drive Systems' precision, with an operational design life of roughly 9,000 hours, approaching Leader Harmonious Drive Systems' 10,000-hour benchmark.

1. What are the testing cycles and decision-making structures for onboarding new harmonic reducer suppliers at

Yaskawa's JVs?

Under Yaskawa's standard corporate quality process, qualifying a new supplier from initial testing to mass-production rollout typically requires three years. However, within joint ventures where the Chinese parent holds controlling interest, the process is streamlined to approximately 12 to 18 months. Consequently, suppliers that do not achieve mass-production entry in 2026 are slated to begin volume shipments in 2027. Sourcing authority rests primarily with the controlling JV partner; for example, Shenzhen Everwin Precision Technology holds the majority stake in Tianji Robot and drives supplier selection, though Yaskawa retains secondary approval rights.

1. What is the current technological capability of Midea's in-house harmonic reducers, and how are they being

integrated into KUKA robots?

Midea's harmonic reducers are currently functional and production-viable, but a measurable performance gap remains relative to domestic tier-1 leaders like Leader Harmonious Drive Systems. Benchmarked against Leader Harmonious Drive Systems, Midea's units deliver roughly 80% of equivalent performance across accuracy, operational stability, and working lifespan. Go-to-market adoption relies primarily on Midea and KUKA's brand standing and service networks. Within KUKA robots, the transition to domestic reducers is being managed incrementally.

Because end customers require time to qualify and accept unfamiliar component brands, KUKA cannot pivot directly from legacy foreign suppliers to Midea. The operational roadmap entails first integrating Leader Harmonious Drive Systems to build customer confidence in leading domestic hardware before broader adoption of internal alternatives.

1. How many harmonic reducer subsidiaries does Midea operate, and how do Welling Robot and Giya Precision Machinery

relate to each other?

Both entities are controlled subsidiaries of Midea Group Co., Ltd under the Midea Industrial Technology umbrella, serving as the group's two primary vehicles across the core robotics components value chain.

Welling Robot focuses on the R&D and mass manufacturing of core motion components, including servo motors and integrated joint modules. Giya Precision Machinery specializes in precision speed reducers. Their product portfolios are complementary, collectively spanning end-to-end component requirements for industrial robotics.

In July 2026, Welling Robot signed an investment agreement with the Shunde District Government in Foshan to advance a new manufacturing facility for Giya Precision Machinery. Representing a total capital commitment of approximately RMB 2 billion, the site will add 300,000 units of annual reducer capacity once operational, addressing demand across industrial and humanoid robotics.

1. Has KUKA's robot build quality changed following its acquisition by Midea?

Product quality across KUKA's lineup has diverged into two categories. Legacy, pre-acquisition models that remain in continuous production have seen virtually no change in build quality. Conversely, models developed post-acquisition—particularly following KUKA's transition to a wholly owned operating model—exhibit distinct characteristics from legacy KUKA machinery. These newer models reflect extensive "Midea-led" adaptations across mechanical design, core component selection, and underlying operating software.

1. What is the current annual capacity of major domestic harmonic reducer manufacturers, and are further expansions

planned?

Among leading domestic manufacturers, Leader Harmonious Drive Systems has surpassed 1.2 million units in annual production capacity, while LAIFUAL has exceeded 800,000 units. Based on company capital expenditure roadmaps and projected market demand, additional capacity expansion programs are expected moving forward.