Model 750 - Type A Base Mouting

The Model ATC 750 DC Tachometer-Generator embodies a permanent magnet field surrounding a rotating armature. The commutator segments are made from a special non-corrosive alloy which has an exceptionally long life. The brushes are of a self-lubricating material and are carried in a self-aligning holder which equalizes the pressure of both brushes. The armature shaft rotates on ball bearings which under normal operation do not need lubrication for 15,000 hours running time or approximately 3 years, whichever comes first. Maximum recommended speed is 5,000 rpm. Brush life is greatest at the lower speeds.

The Model ATC 750 DC Tachometer-Generator embodies a permanent magnet field surrounding a rotating armature. The commutator segments are made from a special non-corrosive alloy which has an exceptionally long life. The brushes are of a self-lubricating material and are carried in a self-aligning holder which equalizes the pressure of both brushes. The armature shaft rotates on ball bearings which under normal operation do not need lubrication for 15,000 hours running time or approximately 3 years, whichever comes first. Maximum recommended speed is 5,000 rpm. Brush life is greatest at the lower speeds. Rigid, heavy-duty cast-iron housing and mounting base. ¾" diameter shaft, supported by heavy-duty ball bearings. Includes conduit junction box with ½" N.P.T. opening suitable for flexible conduit, mountable in anyone of four positions. This unit is listed by Underwriter laboratories for use in hazardous locations Division 1 (vapors exist continuously), Class 1, Group D (natural gas or the vapors from lacquer solvents, acetone, alcohols, and petroleum derivatives), and Class 2, Groups
F and G (carbon black, coal or coke dust, grain dust, etc.).

The Model ATC 750 DC Tachometer-Generator embodies a permanent magnet field surrounding a rotating armature. The commutator segments are made from a special non-corrosive alloy which has an exceptionally long life. The brushes are of a self-lubricating material and are carried in a self-aligning holder which equalizes the pressure of both brushes. The armature shaft rotates on ball bearings which under normal operation do not need lubrication for 15,000 hours running time or approximately 3 years, whichever comes first. Maximum recommended speed is 5,000 rpm. Brush life is greatest at the lower speeds. Dust-proof aluminum alloy housing. S.A.E. 7/8" screw type steel mounting with 3/16" drive dog. Used on Diesel and gas engines where a standard S.A.E. screw type tachometer outlet is available. Two binding posts for electrical connection. Approximate torque: 3.0 oz.-in. starting, 4.0 oz.-in. running (1000 RPM). Approximate weight: 1.8 Ibs. (.82 kg.).

The Model ATC 750 DC Tachometer-Generator embodies a permanent magnet field surrounding a rotating armature. The commutator segments are made from a special non-corrosive alloy which has an exceptionally long life. The brushes are of a self-lubricating material and are carried in a self-aligning holder which equalizes the pressure of both brushes. The armature shaft rotates on ball bearings which under normal operation do not need lubrication for 15,000 hours running time or approximately 3 years, whichever comes first. Maximum recommended speed is 5,000 rpm. Brush life is greatest at the lower speeds.
Square aluminum mounting pad with a dust proof aluminum alloy housing and ¼" square drive dog. Mounting pad in accordance with military drawing AND-20005. Two binding posts for electrical
connections.

The Model ATC 750 DC Tachometer-Generator embodies a permanent magnet field surrounding a rotating armature. The commutator segments are made from a special non-corrosive alloy which has an exceptionally long life. The brushes are of a self-lubricating material and are carried in a self-aligning holder which equalizes the pressure of both brushes. The armature shaft rotates on ball bearings which under normal operation do not need lubrication for 15,000 hours running time or approximately 3 years, whichever comes first. Maximum recommended speed is 5,000 rpm. Brush life is greatest at the lower speeds.

Rigid, heavy-duty cast-iron base mounting type housing, with
¾" diameter shaft supported by heavy duty ball bearings for direct coupling, pulley, spur gear or chain and sprocket drive Provided with conduit junction box with ½" N.P.T. opening suitable for flexible conduit which may be located in anyone of four positions at right angle to shaft. Designed for locations which are subject to mechanical abuse or water spray, such as paper mills and chemical plants where cleaning up by hose is frequent. Housing is gasket sealed.

The ATC 758 Series of tachometers all use a multi-pole cylindrical magnet turning in a wound stator constructed from quality transformer iron lamination. Single phase output current is a sine wave over the speed range of the tachometer. These units have 100 ohm stators and are intended for voltage responsive systems. When greater accuracy is required, use a tachometer having a 32 ohm stator (designation F in the type number) and a frequency responsive indicating system. For speeds over 5,000 rpm, use the bearing less AC generators on page 446.
Rigid cast-aluminum base; light-weight, dust-proof aluminum alloy housing. ½" diameter shaft extension for direct coupling drive, pulley, chain and sprocket, or spur gear. Two binding posts for electrical connection.

The ATC 758 Series of tachometers all use a multi-pole cylindrical magnet turning in a wound stator constructed from quality transformer iron lamination. Single phase output current is a sine wave over the speed range of the tachometer. These units have 100 ohm stators and are intended for voltage responsive systems. When greater accuracy is required, use a tachometer having a 32 ohm stator (designation F in the type number) and a frequency responsive indicating system. For speeds over 5,000 rpm, use the bearing less AC generators.

Rigid, heavy-duty cast-iron housing and mounting base, ¾" diameter shaft supported by heavy duty ball bearings. Includes conduit junction box with ½" N.PT. opening suitable for flexible conduit, mountable in any one of four positions.

The ATC 758 Series of tachometers all use a multi-pole cylindrical magnet turning in a wound stator constructed from quality transformer iron lamination. Single phase output current is a sine wave over the speed range of the tachometer. These units have 100 ohm stators and are intended for voltage responsive systems. When greater accuracy is required, use a tachometer having a 32 ohm stator (designation F in the type number) and a frequency responsive indicating system. For speeds over 5,000 rpm, use the bearing less AC generators on page 446.

Dust-proof aluminum alloy housing. S.A.E. 7/8" screw-type steel mounting with 3/16" solid drive dog. Used on Diesel and gas engines where a standard S.A.E. screw-type tachometer outlet is available. Two binding posts for electrical connection.

The ATC 758 Series of tachometers all use a multi-pole cylindrical magnet turning in a wound stator constructed from quality transformer iron lamination. Single phase output current is a sine wave over the speed range of the tachometer. These units have 100 ohm stators and are intended for voltage responsive systems. When greater accuracy is required, use a tachometer having a 32 ohm stator (designation F in the type number) and a frequency responsive indicating system. For speeds over 5,000 rpm, use the bearing less AC generators.

Rigid, heavy-duty cast-iron base-mounting type housing with ¾" diameter shaft supported by heavy duty ball bearings for direct coupling, pulley, spur gear or chain and sprocket drive. Provided with conduit junction box with 1/2 N.P.T. opening suitable for flexible conduit which may be located in anyone of four positions at right angle to shaft. Designed for locations which are subject to mechanical abuse or water spray, such as paper mills and chemical plants where cleaning up by hose is frequent. Housing is gasket sealed.

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 ATC XPF86 and GF86 are designed to meet MIL-S-901 high shock, as required by specification MIL-T-16049.