Direct-Drive vs Belt-Drive Rotary Table: The Hydrostatic Case for Direct Drive

Key Takeaways:

Direct-drive torque motors eliminate belts, gears, and their backlash and vibration. Paired with a hydrostatic film, they give high low-speed torque and clean motion for precision rotary tables.

Direct-Drive vs Belt-Drive Rotary Table: The Hydrostatic Case for Direct Drive
Tags:
direct drive rotary table hydrostatic direct drive torque motor belt drive vs direct drive 485SJM-1350BH precision rotary table drive
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🇷🇺 Русский

Прямой привод против ременного: почему гидростатике подходит прямой привод

Цена ремней

Ремни и шестерни дают люфт, упругость и вибрацию, а на малых подачах — ползучесть.

Прямой привод

Ротор 485SJM-1350BH (1350/2400 Н·м) крутит стол напрямую, без редуктора, с большим моментом на низах. Вместе с плёнкой — плавное движение.

Итог

Нет люфта и ползучести — стол точно следует заданию.

🇻🇳 Tiếng Việt

Trực truyền động so với bánh răng đai: tại sao thủy tĩnh chọn trực truyền

Giá của đai

Đai và bánh răng gây luôn lùi, đàn hồi và rung, tốc độ thấp thì bò.

Trực truyền

Rô-to 485SJM-1350BH (1350/2400 N·m) quay bàn trực tiếp, mô-men lớn ở tốc thấp. Cùng màng dầu — mượt.

Kết quả

Không luôn lùi, không bò — bàn bám vị trí chính xác.

🇫🇷 Français

Entraînement direct vs par courroie : pourquoi l'hydrostatique choisit le direct

Le coût des courroies

Courroies et engrenages apportent jeu, élasticité et vibration, plus rampement lent.

Entraînement direct

Le rotor 485SJM-1350BH (1350/2400 N·m) entraine la table directement, sans réduction, avec couple élevé au bas régime. Avec le film d'huile: mouvement doux.

Résultat

Pas de jeu ni de rampement—la table suit exactement la consigne.

🇩🇪 Deutsch

Direktantrieb vs Riemenantrieb: Warum Hydrostatik auf Direktantrieb setzt

Die Kosten von Riemen

Riemen und Getriebe bringen Spiel, Elastizität und Vibration sowie Kriechen bei kleinen Vorschüben.

Direktantrieb

Der Rotor 485SJM-1350BH (1350/2400 N·m) dreht den Tisch direkt, ohne Getriebe, mit hohem Drehmoment im unteren Bereich. Mit dem Ölfilm: sanfte Bewegung.

Ergebnis

Kein Spiel, kein Kriechen—der Tisch folgt exakt der Sollposition.

The Hidden Cost of Belts and Gears

Belt- and gear-driven rotary tables introduce backlash, elastic wind-up, and transmitted vibration. At low feed they can also exhibit stick-slip. These defects directly limit achievable accuracy.

Hydrostatic direct drive torque motor

Direct Drive on a Hydrostatic Film

A direct-drive torque motor couples the rotor straight to the table. Marusaku uses the 485SJM-1350BH delivering 1350/2400 N·m, giving strong torque at low speed with no mechanical reduction. Combined with the non-contact oil film, motion is smooth from the first micron of rotation.

Result

No backlash, no belt wear, and no stick-slip means the table tracks commanded position exactly—exactly what sub-micron rotary work demands.