Features • Simple circuitry • Bidirectional control • Instantaneous start, stop and reverse • Starting and running current are identical • Stalling causes no damage • Torque can be increased by increasing voltage • Residual (Power Off) torque is always present • Holding torque can be increased by applying DC voltage • Long life and exceptional reliability

SLO-SYN AC Synchronous Motors offer a number of in-herent characteristics that enhance operation, whether driving a load directly or when used as the power source of an AC Gearmotor. These characteristics include extremely rapid starting, stopping and reversing (within 25 milliseconds), and slow basic shaft speeds of 72 or 200 rpm at 60 hertz.

In most applications, SLO-SYN motors are used as single-phase motors, although they are actually two-phase or three-phase designs. Three-phase models need only a capacitor for phase shifting when operated from single-phase power. They can also be used with commercial inverters to achieve variable control of speed. Two-phase motors need both a resistor and a capacitor for the phase-shifting network.

Because of their high torque-to-inertia ratios, SLO-SYN motors can reach synchronous speeds within 25 milliseconds, or 5° typical. Since the connection between rotor and stator is magnetic, the motors can be stalled without damage. When this occurs, the magnetic field acts as a nonabrasive clutch which allows the rotor to stop without overheating or physical damage. A prolonged stall condition can cause gear and bearing wear however, so the motors should not be stalled for long periods of time.

The SLO-SYN motor is unique in that it has the capability of being operated as an AC synchronous, constant speed motor or as a phase switched DC stepper motor. In either case, it is classified as a permanent magnet inductor motor. Figure 1 shows the simplicity of the basic motor construction. Note that the motor has no brushes, commutators, belts or slip rings. Essentially, the motor consists of a rotor and a stator which make no physical contact at any time, due to a carefully maintained air gap. As a result of the simple construction, the motor provides long life and high reliability. A continuous running life of five years can be expected.

Click here to download the complete 48pg. DESIGN ENGINEER'S GUIDE TO
AC SYNCHRONOUS MOTORS PDF File.

Gear Motors

Features • High Power - allows use of a smaller motor • Smooth, quiet operation • Bidirectional • Start, stop and reverse within 25 milliseconds • Can be controlled with a single-pole, three-position switch • Flexible coupling allows a substantial load inertia increase • Shafts have flats or keyways standard (SS221 and larger motors only) • Available with connectors, leads or cast terminal enclosures • Class B insulation • Will not overheat or be damaged if stalled • Mating connector standard on connector models • Single-phase requires only a simple phase-shifting network • Can operate from two- or three-phase (de-pending on motor model), variable frequency supply without phase-shifting network.

Typical Applications • Automotive test equipment • Tape dispenser • Remote control of switches, rheostats • X-Y positioning • Textile edge guide controls • Printing press ink pump control, color alignment • Film handling • Microfilm scanners • Paper feed • Furnace damper controls

• Valve control • Timing belt drives • Conveyor belt drives • Card positioning • X-Ray scanning • Antenna rotors • Generators • Automated welding equipment • Packaging machines, labeling • Medical pumps • Fluid metering

SLO-SYN AC Gearmotors utilize SLO-SYN AC Synchronous Motors combined with an in-line gear speed reduction assembly which minimizes space requirements and simplifies mounting compared with other gearmotors. The gearbox design allows the motors to be small and compact, yet provides the strength needed to handle torque up to 26 foot-pounds (35.3 newton-meters). Ratios from 3:1 to 125:1 are available. All are rated for 100 pound (45.4 kg) axial loads and 150 pound (68 kg) radial loads, so external support mechanisms and additional bearings will not be needed in most applications. The AC Gearmotor shaft is slotted to accept a standard Woodruff key for ease of coupling and rigid mounting of the load. The gearmotors are permanently lubricated and do not require scheduled maintenance. The use of steel gears combined with the robust design of the gear assembly assures a typical operating life of 7 to 10 years.

Gears and Pulleys

When the load is driven through gears or pulleys, the torque should be decreased or increased by the overall ratio.

For example, if the load is 90-ounce-inches (63.6 Ncm) and the step-down ratio is 3:1,
the required torque would be 30-ounce-inches (21.2 Ncm).

Load inertia should be decreased or increased by the square of the ratio.
For example, with a load inertia of 4 pound-inches² (11.71 kg-cm²) and a 2:1 step-down ratio,
the effective inertia would be 1 pound-inch² (2.93 kg-cm²) plus the inertia of the first gear of the pulley.

Motor Selections
Once all the rquirements of the application including input voltage and frequency are known
refer to mhe Ratings chart and select the motor which best suits these requirements.

If additional information or technical assistance is needed, contact the nearest office of Superior Electric listed on the back cover.
A representative will be pleased to help you select the best motor for your application.

DIMENSIONS

Basic Motor Type	'A' Max.	NOTES: 1-Dimensions in brackets are millimeters. 2-Tolerance on decimals .XXX = ± 0.005 [0.13] unless otherwise specified 3-Dimensions shown apply before painting or plating 4-This drawing shows only those features which are pertinent to the form, fit, and function of the motor.	* Shaft Runout .002 [0.051] Max. **Diameter Tolerance ± .002 [0.051] Diameter Concentric to Shaft Diameter within .003 [0.077] T.I.R. ***Surface Square To Shaft Diameter within .003 [0.77] T.I.R.
SS25	2.27 [57.66]
TS25	3.27 [83.06]

SS25, SS25E, TS25 and TS25E Motors