For an axial-flux motor to go high-speed, structural strength is one hurdle, but past strength there is an even more hidden hurdle: dynamic balancing. A disc rotor has a large diameter and high speed; even a slight mass offset will, at high rotational speed, amplify into an obvious centrifugal force fluctuation that finally shows up as vibration and noise.
Dynamic balancing looks at the "residual unbalance" — how much mass eccentricity remains once the rotor spins. The industry commonly uses balance grades as a constraint: the stricter the grade, the smaller the residual allowed and the higher the demands on process and inspection. The disc structure is flat with a special inertia distribution, so the balancing method often has to be chosen between single-side and double-side.
Practical correction comes down to two routes: adding weight or removing weight. Adding weight means adding mass on the light side; removing weight means cutting material from the heavy side. Disc rotors are usually a combination of magnets and a back iron, often wrapped in carbon fibre or a sleeve, so where to add and where to cut must avoid the critical magnetic-circuit and strength zones, or the balance will be fixed but something else will go wrong. This process is directly tied to overall machine performance. If balancing is inadequate, vibration travels along the shaft and housing, making noise and accelerating bearing wear; for an already sensitive air gap, increased rotor radial runout can bring out magnetic-pull imbalance and form a vicious circle.
In high-speed rotor joining, Jiuju builds dynamic balancing into the process rather than fixing it afterwards. First control the coaxiality and face runout of individual parts, then balance at the whole-rotor level — far cheaper than discovering vibration after final assembly and reworking. Dynamic balancing and structural strength are two separate lines: one governs "will it fly apart", the other "will it run smoothly". Only when both pass can a high-speed disc motor truly hold up.
又是一年月圆时至，秋风送桂香，阖家庆团圆。在浓浓的中秋氛围中，久巨始终坚守智造初心，企业每一份成长与收获，都离不开全体同事的勤恳付出与同心并肩。
时光缓缓流淌，岁月镌刻成长。为感谢全体伙伴一路并肩同行，传递公司人文关怀，久巨 7‑9 月员工集体生日会温情如约而至。
金秋送爽，月满中秋。为增进会员企业交流，凝聚行业发展合力，深圳市音响行业协会中秋会员联谊会于 9 月 18 日在会员单位深圳盛佳丽电子圆满举办。
The shipping area outside the workshop was a hive of activity. After multiple rounds of full-machine commissioning, simulated mass-production validation, and factory quality inspection, a Jiuju DC motor automatic assembly line completed all factory-out procedures, was loaded onto trucks on schedule, and is about to depart for the customer's production base, helping the customer's project advance production implementation on plan.
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