{"id":558,"date":"2026-05-27T03:22:54","date_gmt":"2026-05-27T03:22:54","guid":{"rendered":"https:\/\/planetary-gearboxes.com\/?post_type=product&p=558"},"modified":"2026-05-27T03:25:15","modified_gmt":"2026-05-27T03:25:15","slug":"ep-bae-large-flange-planetary-gearbox","status":"publish","type":"product","link":"https:\/\/planetary-gearboxes.com\/sr\/\u043f\u0440\u043e\u0438\u0437\u0432\u043e\u0434\/ep-bae-large-flange-planetary-gearbox\/","title":{"rendered":"\u0412\u0438\u0441\u043e\u043a\u043e\u043f\u0440\u0435\u0446\u0438\u0437\u043d\u0438 \u043f\u043b\u0430\u043d\u0435\u0442\u0430\u0440\u043d\u0438 \u043c\u0435\u045a\u0430\u0447 \u0441\u0435\u0440\u0438\u0458\u0435 BAE \u2014 \u0442\u0438\u043f \u0441\u0430 \u0432\u0435\u043b\u0438\u043a\u043e\u043c \u043f\u0440\u0438\u0440\u0443\u0431\u043d\u0438\u0446\u043e\u043c (EP-BAE050 \u0434\u043e EP-BAE235)"},"content":{"rendered":"

<\/main><\/p>\n
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EP-BAE Series \u2014 Large-Flange High-Precision Planetary Gearbox for Heavy Interface Loads<\/h2>\n
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\"EP-BAE<\/p>\n

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Large Flange<\/div>\n
Oversized Output Interface<\/div>\n<\/div>\n
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\u22643\u2032<\/div>\n
\u0417\u0430\u0437\u043e\u0440 (\u043b\u0443\u0447\u043d\u0438 \u043c\u0438\u043d)<\/div>\n<\/div>\n
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2,000<\/div>\n
Max Torque (N\u00b7m)<\/div>\n<\/div>\n
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\u226595%<\/div>\n
\u0415\u0444\u0438\u043a\u0430\u0441\u043d\u043e\u0441\u0442<\/div>\n<\/div>\n<\/div>\n

\n\u2190 Browse All Planetary Gearbox Series
\n<\/a><\/div>\n
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The EP-BAE series high-precision planetary gearbox<\/strong> is Korea Ever-Power’s large-flange variant, designed for applications where the gearbox-to-machine interface must carry significant overturning moments \u2014 bending loads applied perpendicular to the output shaft axis \u2014 in addition to the primary output torque. The defining engineering feature is an output flange outer diameter substantially larger than the gearbox body diameter<\/strong>, extending the bolt-circle radius and dramatically increasing the mounting interface’s resistance to flange tipping, bending, and bolt-tension variation under dynamic load reversals.<\/p>\n

Seven frame sizes from EP-BAE050 through EP-BAE235 cover rated output torque from 19 N\u00b7m to 2,000 N\u00b7m with P1 grade backlash of \u22643 arcmin single-stage<\/strong> and \u22645 arcmin two-stage<\/strong>, \u226595% single-stage efficiency<\/strong>, and noise below 65 dB(A). Korea Ever-Power publishes moment of inertia data<\/strong> for all seven EP-BAE frames \u2014 a key differentiator enabling servo drive engineers to perform inertia-ratio calculations before finalising motor and drive selection, without waiting for physical units.<\/p>\n

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\ud83d\udd32 Oversized Flange OD<\/div>\n
Flange larger than body \u2014 maximises bolt-circle radius for overturning moment resistance.<\/div>\n<\/div>\n
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\ud83d\udcd0 Inertia Data Published<\/div>\n
J values for all 7 frames \u2014 servo inertia-ratio calculation before hardware delivery.<\/div>\n<\/div>\n
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\ud83c\udfaf \u22643 Arcmin P1<\/div>\n
Same precision as inline EP-BAB \u2014 in large-flange format.<\/div>\n<\/div>\n<\/div>\n<\/div>\n<\/div>\n<\/section>\n
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Why Flange Size Matters \u2014 The Engineering Case for EP-BAE<\/h2>\n
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<\/p>\n

\n
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Standard Flange (BAB)
\n\u250c\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2510
\n\u2502 \u2588\u2588\u2588\u2588\u2588\u2588\u2588\u2588 \u2502 \u2190 flange = body width
\n\u2502 \u2588\u2588 GB \u2588\u2588 \u2502
\n\u2502 \u2588\u2588\u2588\u2588\u2588\u2588\u2588\u2588 \u2502
\n\u2514\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2518
\nbolt-circle radius = R\u2081Large Flange (BAE)
\n\u250c\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2510
\n\u2502 \u2588\u2588\u2588\u2588\u2588\u2588\u2588\u2588\u2588\u2588\u2588\u2588\u2588\u2588 \u2502 \u2190 flange > body width
\n\u2502 \u2588\u2588 GB \u2588\u2588 \u2502
\n\u2502 \u2588\u2588\u2588\u2588\u2588\u2588\u2588\u2588\u2588\u2588\u2588\u2588\u2588\u2588 \u2502
\n\u2514\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2518
\nbolt-circle radius = R\u2082 > R\u2081Overturning resistance:
\nM_resist \u221d R\u00b2
\n(BAE: significantly higher)<\/div>\n<\/div>\n<\/div>\n

<\/p>\n

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Three Structural Problems the Large Flange Solves<\/h3>\n
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\u2460 Overturning Moment at the Mounting Interface<\/strong><\/p>\n

When a cantilevered load \u2014 a rotary table workpiece, a robot arm segment, a spindle head \u2014 applies a force perpendicular to the output shaft, it creates a bending moment at the gearbox output flange. The mounting bolts on one side go into tension while those on the opposite side go into compression. A larger flange bolt-circle radius increases the moment arm of each bolt, reducing the peak bolt tension for the same applied bending moment. EP-BAE’s oversized flange is specifically designed to handle these overturning loads that a standard-width flange would concentrate into fewer, more highly stressed bolts.<\/p>\n<\/div>\n

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\u2461 Interface Torsional Stiffness Under Rapid Reversals<\/strong><\/p>\n

In precision servo positioning applications with rapid direction reversals \u2014 a rotary table repeatedly indexing to closely spaced angular positions \u2014 the torsional compliance at the flange interface contributes a positioning error that appears identical to gearbox backlash. A larger flange with more bolts at greater radius, all preloaded to rated torque, is torsionally stiffer at the mechanical interface than a smaller flange. This means the P1 \u22643 arcmin backlash of the gearbox is more faithfully preserved at the workpiece level.<\/p>\n<\/div>\n

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\u2462 Radial Load Distribution Over Greater Surface Area<\/strong><\/p>\n

Heavy rotary tables carrying large workpieces generate substantial radial force at the output shaft bearing from the workpiece overhang. The EP-BAE large flange also accommodates a larger output shaft bearing span \u2014 the critical dimension for radial load capacity. This geometry extends bearing L10 life under the combined torque and radial loading conditions typical of large CNC rotary tables and heavy indexing equipment.<\/p>\n<\/div>\n<\/div>\n<\/div>\n<\/div>\n

<\/p>\n

EP-BAE vs EP-BAB \u2014 When the Large Flange Justifies the Choice<\/h3>\n
\n\n\n\n\n\n\n\n\n\n\n\n
Criterion<\/th>\nEP-BAE \u2605 Large Flange<\/th>\nEP-BAB Standard Flange<\/th>\n<\/tr>\n<\/thead>\n
Flange OD vs body OD<\/td>\nFlange significantly larger than body<\/td>\nFlange matches body width<\/td>\n<\/tr>\n
Overturning moment capacity<\/td>\nHigh \u2014 large bolt-circle radius<\/td>\n\u0421\u0442\u0430\u043d\u0434\u0430\u0440\u0434\u043d\u043e<\/td>\n<\/tr>\n
Interface torsional stiffness<\/td>\nHigher (more bolts at greater radius)<\/td>\n\u0421\u0442\u0430\u043d\u0434\u0430\u0440\u0434\u043d\u043e<\/td>\n<\/tr>\n
Inertia data published<\/td>\nYes \u2014 all 7 frames<\/td>\nOn request<\/td>\n<\/tr>\n
Backlash \/ Efficiency<\/td>\n\u22643 arcmin P1 \/ \u226595%<\/td>\n\u22643 arcmin P1 \/ \u226595%<\/td>\n<\/tr>\n
Machine footprint<\/td>\nLarger (flange extends beyond body)<\/td>\nCompact<\/td>\n<\/tr>\n
\u041d\u0430\u0458\u0431\u043e\u0459\u0435 \u0437\u0430<\/td>\nHeavy rotary tables, spindle heads, cantilevered loads<\/td>\nGeneral servo automation, robots, packaging<\/td>\n<\/tr>\n<\/tbody>\n<\/table>\n<\/div>\n
\u25b8 Selection rule: <\/span>
\nChoose EP-BAE when your application involves significant overturning moments at the output flange (rotary table with heavy workpiece overhang, spindle head with cutting forces, cantilevered arm segment). Choose EP-BAB when the machine structure carries radial loads elsewhere and the gearbox only needs to transmit output torque.<\/span><\/div>\n<\/section>\n

\"BAE \"BAE<\/p>\n

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EP-BAE050 to EP-BAE235 \u2014 Complete Large-Flange Precision Planetary Gearbox Specifications<\/h2>\n
\n\n\n\n\n\n\n\n\n\n\n\n\n\n\n\n
Common Specifications \u2014 All EP-BAE Frames<\/th>\n<\/tr>\n<\/thead>\n
Backlash P1 (Precision Grade)<\/td>\nSingle-stage \u22643 arcmin \u00b7 Two-stage \u22645 arcmin<\/td>\n<\/tr>\n
Backlash P2 (Standard Grade)<\/td>\nSingle-stage \u22648 arcmin \u00b7 Two-stage \u226412 arcmin<\/td>\n<\/tr>\n
Single-Stage Ratios<\/td>\n3, 4, 5, 6, 7, 8, 9, 10<\/td>\n<\/tr>\n
Two-Stage Ratios<\/td>\n15, 20, 25, 30, 35, 40, 45, 50, 60, 70, 80, 90, 100<\/td>\n<\/tr>\n
\u0415\u0444\u0438\u043a\u0430\u0441\u043d\u043e\u0441\u0442<\/td>\nSingle-stage \u226595% \u00b7 Two-stage \u226592%<\/td>\n<\/tr>\n
Noise (3,000 rpm, no-load, 1 m)<\/td>\n<65 dB(A)<\/td>\n<\/tr>\n
Peak Torque (Emergency Stop)<\/td>\n3\u00d7 Rated Output Torque (instantaneous)<\/td>\n<\/tr>\n
Max Acceleration Torque<\/td>\n60% of Rated Torque (T\u2082s = 0.6 \u00d7 T\u2082Nor)<\/td>\n<\/tr>\n
\u0420\u0430\u0434\u043d\u0430 \u0442\u0435\u043c\u043f\u0435\u0440\u0430\u0442\u0443\u0440\u0430<\/td>\n0 \u00b0C to +40 \u00b0C<\/td>\n<\/tr>\n
Output Shaft<\/td>\nS1: Smooth \u00b7 S2: With keyway<\/td>\n<\/tr>\n
Backlash Measurement Condition<\/td>\nOutput 100 RPM, force applied at output shaft centre<\/td>\n<\/tr>\n<\/tbody>\n<\/table>\n<\/div>\n

<\/p>\n

Rated Output Torque (N\u00b7m) \u2014 Single-Stage (i = 4 to 10, key ratios)<\/h3>\n
\n\n\n\n\n\n\n\n\n\n\n
\u041e\u0434\u043d\u043e\u0441<\/th>\nEP-BAE050<\/th>\nEP-BAE070<\/th>\nEP-BAE090<\/th>\nEP-BAE120<\/th>\nEP-BAE155<\/th>\nEP-BAE205<\/th>\nEP-BAE235<\/th>\n<\/tr>\n<\/thead>\n
i=4<\/td>\n19<\/td>\n50<\/td>\n140<\/td>\n290<\/td>\n542<\/td>\n1,050<\/td>\n1,700<\/td>\n<\/tr>\n
i=6<\/td>\n\u2014<\/td>\n\u2014<\/td>\n\u2014<\/td>\n\u2014<\/td>\n\u2014<\/td>\n\u2014<\/td>\n2,000<\/td>\n<\/tr>\n
i=7<\/td>\n19<\/td>\n50<\/td>\n140<\/td>\n300<\/td>\n550<\/td>\n1,100<\/td>\n1,800<\/td>\n<\/tr>\n
i=8<\/td>\n17<\/td>\n45<\/td>\n120<\/td>\n260<\/td>\n500<\/td>\n1,000<\/td>\n1,600<\/td>\n<\/tr>\n
i=9<\/td>\n14<\/td>\n40<\/td>\n100<\/td>\n230<\/td>\n450<\/td>\n900<\/td>\n1,500<\/td>\n<\/tr>\n
i=10<\/td>\n14<\/td>\n40<\/td>\n100<\/td>\n230<\/td>\n450<\/td>\n900<\/td>\n1,500<\/td>\n<\/tr>\n<\/tbody>\n<\/table>\n<\/div>\n

<\/p>\n

Rated Output Torque (N\u00b7m) \u2014 Two-Stage (key ratios)<\/h3>\n
\n\n\n\n\n\n\n\n\n
\u041e\u0434\u043d\u043e\u0441<\/th>\nEP-BAE050<\/th>\nEP-BAE070<\/th>\nEP-BAE090<\/th>\nEP-BAE120<\/th>\nEP-BAE155<\/th>\nEP-BAE205<\/th>\nEP-BAE235<\/th>\n<\/tr>\n<\/thead>\n
i=25<\/td>\n22<\/td>\n60<\/td>\n160<\/td>\n330<\/td>\n650<\/td>\n1,200<\/td>\n2,000<\/td>\n<\/tr>\n
i=30<\/td>\n20<\/td>\n55<\/td>\n150<\/td>\n310<\/td>\n600<\/td>\n1,100<\/td>\n1,900<\/td>\n<\/tr>\n
i=45<\/td>\n14<\/td>\n40<\/td>\n100<\/td>\n230<\/td>\n450<\/td>\n900<\/td>\n1,500<\/td>\n<\/tr>\n
i=100<\/td>\n14<\/td>\n40<\/td>\n100<\/td>\n230<\/td>\n450<\/td>\n900<\/td>\n1,500<\/td>\n<\/tr>\n<\/tbody>\n<\/table>\n<\/div>\n

<\/p>\n

\u2605 Published Moment of Inertia \u2014 Single-Stage (kg\u00b7cm\u00b2)<\/h3>\n
\n\n\n\n\n\n
\u041e\u043a\u0432\u0438\u0440<\/th>\nEP-BAE050<\/th>\nEP-BAE070<\/th>\nEP-BAE090<\/th>\nEP-BAE120<\/th>\nEP-BAE155<\/th>\nEP-BAE205<\/th>\nEP-BAE235<\/th>\n<\/tr>\n<\/thead>\n
J (kg\u00b7cm\u00b2)
\ni=3~10<\/span><\/td>\n		0.03<\/td>\n0.13<\/td>\n0.44\u20130.45<\/td>\n2.57\u20132.62<\/td>\n7.03\u20137.14<\/td>\n22.48\u201322.51<\/td>\n50.56\u201350.97<\/td>\n<\/tr>\n<\/tbody>\n<\/table>\n<\/div>\n
\u25b8 How to use inertia data: <\/span>
\nAdd J_gearbox to J_load (reflected to output shaft) to calculate total reflected inertia at the motor. Divide by motor rotor inertia to verify servo inertia ratio. Industry guideline: ratio \u22645:1 for standard servo; \u226410:1 for position-controlled servo with inertia compensation enabled. Use this published J data early in the design phase \u2014 before hardware is ordered \u2014 to confirm motor size and drive tuning requirements.<\/span><\/div>\n

<\/p>\n

Maximum Rated Input Speed (RPM) by Frame<\/h3>\n
\n\n\n\n\n\n
\u041e\u043a\u0432\u0438\u0440<\/th>\n050<\/th>\n070<\/th>\n090<\/th>\n120<\/th>\n155<\/th>\n205<\/th>\n235<\/th>\n<\/tr>\n<\/thead>\n
Max RPM<\/td>\n5,000<\/td>\n5,000<\/td>\n5,000<\/td>\n4,000<\/td>\n4,000<\/td>\n3,000<\/td>\n2,000<\/td>\n<\/tr>\n<\/tbody>\n<\/table>\n<\/div>\n<\/section>\n

<\/p>\n

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Model Designation Guide \u2014 EP-BAE Part Number<\/h2>\n
\n
EP-BAE 090 \/ 25 \/ S2 \/ P1 \/ T1<\/div>\n
\n
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EP-BAE<\/div>\n
\u041a\u043e\u0440\u0435\u0458\u0430 \u0415\u0432\u0435\u0440-\u041f\u0430\u0443\u0435\u0440
\nLarge Flange Series<\/div>\n<\/div>\n
\n
090<\/div>\n
Body diameter
\n90 mm<\/div>\n<\/div>\n
\n
25<\/div>\n
Gear ratio
\ni = 25:1<\/div>\n<\/div>\n
\n
S2<\/div>\n
Output shaft
\nwith keyway<\/div>\n<\/div>\n
\n
\u041f1<\/div>\n
Precision grade
\n\u22643 \u043b\u0443\u0447\u043d\u0430 \u043c\u0438\u043d\u0443\u0442\u0430<\/div>\n<\/div>\n
\n
T1<\/div>\n
Input flange type
\n(motor-matched)<\/div>\n<\/div>\n<\/div>\n<\/div>\n
\n\n\n\n\n\n\n\n\n\n\n
Position<\/th>\nCode<\/th>\nMeaning<\/th>\n<\/tr>\n<\/thead>\n
\u0421\u0435\u0440\u0438\u0458\u0430<\/td>\nEP-BAE<\/td>\nKorea Ever-Power, large oversized output flange series<\/td>\n<\/tr>\n
\u0412\u0435\u043b\u0438\u0447\u0438\u043d\u0430 \u043e\u043a\u0432\u0438\u0440\u0430<\/td>\n050\/070\/090\/120\/155\/205\/235<\/td>\nBody diameter in mm (note: BAE uses 050\u2013235, not the BAB 042\u2013220 scale)<\/td>\n<\/tr>\n
Gear Ratio<\/td>\n3\u201310 \/ 15\u2013100<\/td>\nSingle-stage: 3,4,5,6,7,8,9,10 \u00b7 Two-stage: 15, 20, 25\u2026100<\/td>\n<\/tr>\n
Output Shaft<\/td>\nS1 \/ S2<\/td>\nS1: Smooth \u00b7 S2: With keyway<\/td>\n<\/tr>\n
Backlash Grade<\/td>\nP1 \/ P2<\/td>\nP1: \u22643’\/\u22645′ (single\/two-stage) \u00b7 P2: \u22648’\/\u226412′<\/td>\n<\/tr>\n
Input Flange<\/td>\nT1 \/ T2<\/td>\nSpecify servo motor model for correct input adapter plate<\/td>\n<\/tr>\n<\/tbody>\n<\/table>\n<\/div>\n<\/section>\n

<\/p>\n

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Applications \u2014 Where Large-Flange Planetary Gearbox Performance is Required<\/h2>\n
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Heavy CNC Rotary Table A-Axis Drives<\/h3>\n

Large CNC rotary tables for heavy steel and mould machining \u2014 carrying workpieces of 500 kg to 3,000 kg \u2014 apply overturning moments at the table drive that exceed what standard-flange precision gear reducers are rated for. This large-flange planetary gearbox \u2014 EP-BAE155 and EP-BAE205 \u2014 is specified for these applications, where the large flange bolt-circle distributes the mounting load to resist the bending moment from an offset heavy workpiece under cutting forces. At ratios 25:1\u201350:1, these frames deliver 650\u20131,200 N\u00b7m rated torque while the oversized flange carries the structural load that the gear train alone cannot resist. Pairs with precision CV drive shafts<\/a> for dual-drive large rotary table configurations.<\/p>\n

\u00a0\"pls-\u0432\u0438\u0441\u043e\u043a\u043e\u043f\u0440\u0435\u0446\u0438\u0437\u043d\u0438-\u043f\u043b\u0430\u043d\u0435\u0442\u0430\u0440\u043d\u0438-\u043c\u0435\u045a\u0430\u0447-\u043a\u043e\u043c\u043f\u043b\u0435\u0442\u0430\u043d\"<\/p>\n<\/div>\n

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Semiconductor Wafer Handler \u2014 Large Flange Theta Axis<\/h3>\n

200 mm and 300 mm wafer handlers use a theta-axis planetary gearbox to rotate the end-effector arm over a full 360\u00b0 at high speed with sub-arcminute positional repeatability. The EP-BAE’s large flange provides more bolt attachment points to the vacuum-compatible handler frame \u2014 critical in cleanroom equipment where micro-vibration from interface compliance degrades wafer placement accuracy. EP-BAE070 and EP-BAE090 at 25:1\u201350:1 cover the torque and speed range of 300 mm class handler theta drives. The published inertia data allows drive engineers to verify inertia ratio compliance with the semiconductor equipment manufacturer’s servo specification before build.<\/p>\n<\/div>\n

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5-Axis CNC Spindle Tilting Head (B-Axis)<\/h3>\n

5-axis machining centre spindle tilting heads carry the spindle motor, spindle, and tool mass cantilevered from the B-axis pivot drive \u2014 a significant overturning load at the gear reducer output flange. The EP-BAE large flange at the B-axis pivot resists this moment over a larger bolt-circle radius than a standard-flange precision planetary gearbox, preventing the micro-rocking at the flange interface that would otherwise appear as angular positioning error at the tool tip. EP-BAE090 and EP-BAE120 at 10:1\u201325:1 serve spindle tilt ranges up to \u00b190\u00b0 with P1 \u22643 arcmin backlash across the entire tilt range.<\/p>\n<\/div>\n<\/div>\n

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Application Reference<\/h3>\n