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Marsh Bellofram DigiTec Division 758-GF86/XF86 Series Bearingless AC Generators

Marsh Bellofram DigiTec Division 758-GF86/XF86 Series Bearingless AC Generators

Product catalog summary

Overview: The document describes the 758-GF86/XF86 Series AC generators, which are basic generators consisting of a stator and a permanent magnet rotor. These generators are designed for OEM use, are maintenance-free, and can operate in harsh environments.

Specifications: The generators have no bearings or brushes, making them maintenance-free. They can withstand oil, grease, and high temperatures, allowing installation in inaccessible areas like gearboxes. They have low torque burdens and can reach speeds up to 100,000 rpm. Potted models with epoxy-encapsulated stator windings are available, requiring a minimum order of six pieces.

Compliance: Models 758, types XPF86 and GF86, comply with MIL-S-901 high shock standards as per MIL-T-16049 specifications.

Installation: The rotor should be mounted to the shaft's true center with care, especially at high speeds. A steel screw with an SAE thread is recommended for maximum tightening. Press fitting the rotor is discouraged due to the brittle nature of the magnetic rotor material.

Indicators: ATC provides digital RPM indicators compatible with AC and DC voltage signals and AC frequency, designed to minimize display fluctuations.

Technical Data:

Model XF86: Speed range 500-20,000 RPM, no housing, 8 stator poles, rotor style 6, 10V output at 1000 RPM, 32Ω resistance, 120Hz frequency at 1800 RPM.
Model GF86: Similar specifications with cast iron housing.
Model XF44: Speed range 20,000-40,000 RPM, no housing, 4 stator poles, rotor style 4, 15V output, 60Hz frequency.
Model GF44: Similar specifications with cast iron housing.

Dimensions: Model 758 Type XF86 and GF86 have specific rotor styles and are mounted in cast iron housing, weighing 7.27 lbs.

Catalog excerpts

Marsh Bellofram DigiTec Division 758-GF86/XF86 Series Bearingless AC Generators-1

800.727.5646 atcdigitec.com Digitec Division 758-GF86/XF86 Tachometers/Generators // 758-GF86/XF86 Series 339 These are AC generators of the most basic form, consisting only of a stator and a permanent magnet rotor which mounts on a rotating shaft in the customer’s equipment. Designed primarily for use by OEM’s, these extremely rugged and dependable generators have no bearings or brushes and therefore, require absolutely no maintenance. Because they are impervious to oil, grease and relatively high temperatures, they may be installed in inaccessible areas, such as gear boxes, which permits the saving of space and the reduction of costs. They have extremely low torque burdens of less than one ounce-inch and are capable of speeds up to 100,000 rpm. “Potted” Models. Units are available with the stator windings encapsulated with an epoxy material for greater protection. These are designed with the letter “P” in the type number. Minimum order of 6 pieces. Mil-spec compliance. Model 758, types XPF86 and GF86 are designed to meet MIL-S-901 high shock, as required by specification MIL-T-16049. Rotor Installation: The rotor of the generator unit should be mounted to the true center of the shaft with extreme care, particularly in higher speed applications. The relatively small inertia of the rotor makes it possible to secure it to the shaft with a right hand thread regardless of the direction of rotation. It is recommended that a steel screw having an SAE thread be used to permit maximum tightening. NOTE: DO not press fit the rotor to the shaft, or the rotor will shatter because of the brittle nature of the magnetic rotor material. Indicators: ATC offers digital RPM indicators that operate from AC and DC voltage signals, and from AC frequency. These meters are specially modified to reduce the rapid fluctuation in display digits that result from varying speed rates. Consult factory for details. B e ar ing l e s s A C G e n e r a t o r s TYPE MODEL NUMBER SPEED RANGE (RPM) HOUSING NO. OF STATOR POLES ROTOR STYLE NO. VOLT OUTPUT AT 1000 RPM (Open Circuit) STATOR RESISTANCE (½ ±20%) FREQUENCY AT 1800 RPM (HO) XF86 758-9989002 500-20,000 None 8 6 10 ± 1% 32 120 XPF86 758-0077533 GF86 758-9912002 500-20,000 Cast Iron 8 6 10 ± 1% 32 120 GPF86 758-0300008 XF44 758-0088466 20,000-40,000 None 4 4 +3% 2-0% 15 60 XPF44 758-0067273 GF44 758-0049982 20,000-40,000 Cast Iron 4 4 +3% 2-0% 15 60 GPF44 758-D084866 \\\DIMENSIONS (INCHES/MILLIMETERS) MODEL 758 –TYPE XF86 Rotor Style 4 Rotor Style 6 Mounted in cast iron housing. Weight: 7.27 lbs. MODEL 758 –TYPE GF86

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