AC Motors & Gear Motors > Constant Speed AC Motors > Low Speed Synchronous Motors - SMK Series

SMK Series Low Speed Synchronous Motors

Low-speed synchronous motors provide highly precise speed regulation, low-speed rotation and quick bi-directional rotation. The basic construction of low-speed synchronous motors is the same as that of stepper motors. Since they can be driven by an AC power supply, they are sometimes called AC stepper motors.

Parallel Shaft Gear or Round Shaft (no Gear)
Single-Phase 115 VAC

AC Motor Lineup

Frame Size	Gear Type	Power Supply	Holding Torque		Motor Speed
1.65 in. (42 mm) Low-Speed Synchronous Motor	Parallel Shaft Gear	Single-Phase 115 VAC	1.32 ~ 4.9 lb-in	0.15 ~ 0.56 N·m	72 r/min (60 Hz) 60 r/min (50 Hz)*
1.65 in. (42 mm) Low-Speed Synchronous Motor	Round Shaft (no Gear)	Single-Phase 115 VAC	0.63 ~ 1.27 oz-in	4.5 ~ 9 mN·m
2.22 / 2.36 in. (56.4 / 60 mm) Low-Speed Synchronous Motor	Parallel Shaft Gear	Single-Phase 115 VAC	3.5 ~ 26 lb-in	0.4 ~ 3 N·m
2.22 / 2.36 in. (56.4 / 60 mm) Low-Speed Synchronous Motor	Round Shaft (no Gear)	Single-Phase 115 VAC	3.5 oz-in	25 mN·m
3.35 / 3.54 in. (85 / 90 mm) Low-Speed Synchronous Motor	Parallel Shaft Gear	Single-Phase 115 VAC	12.3 ~ 88 lb-in	1.4 ~ 10 N·m
3.35 / 3.54 in. (85 / 90 mm) Low-Speed Synchronous Motor	Round Shaft (no Gear)	Single-Phase 115 VAC	5.1 ~ 12.6 oz-in	36 ~ 89 mN·m

*Motor Speed for SMK014MA-A is 36 r/min (60 Hz) and 30 r/min (50 Hz)

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Product Features
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Low Speed Synchronous Motors

Low-Speed Synchronous Rotation

The motor rotates at a speed proportional to and accurately synchronized with the frequency of the power supply. A fluctuation in load does not affect the rotation speed.

At 50 Hz 60 r/min (30 r/min for SMK014MA-*)
At 60 Hz 72 r/min (36 r/min for SMK014MA-*)

Precise Positioning

The motor can be stopped instantly by turning off the power supply. The stopping accuracy within the motor's permissible load inertia is ±10°.

Continuous Rated Capacitor-Run Motor

This is a capacitor-run motor that can be driven by a capacitor only. (An external resistance is needed for SMK5 type). This can be driven at a continuous rating even when bi-directional operation is required.

Superb Starting, Stopping, and Reversing Characteristics

If operated within the permissible load inertia, the motor can start, stop and reverse with 1.5 cycles (0.03 sec at 50 HZ, 0.025 sec at 60 Hz) of the power supply frequency.

Frequent Start-Stop

Vertical Applications

Constant speed can be maintained even during lowering operations. Low-speed synchronous motors are suitable for applications where vertical operation at a constant speed is required.

Lowering Application

Holding Torque

Since a permanent-magnet, multi-poled rotor is used, the motor has holding torque even when the motor is not energized. When used with a gearhead, comparatively high holding torque can be utilized. (When a larger holding torque is required, a DC power supply can be connected as soon as the AC power supply is cut off.)

Long Life, Low Noise GN-S Gearhead Available

The new "long life, low noise GN-S gearhead" achieves a long rated life of 10,000 hours, twice the level of a conventional gearhead, by adopting innovative technologies and structure. Parallel Shaft models.

Gearhead

Flexible Couplings

These products are clamp type couplings used to connect a motor or gearhead shaft to the shaft of the equipment.

Select Coupling

CR Circuit for Surge Suppression

This product is used to protect the contacts of a relay or switch used in the forward/reverse circuit section or the instantaneous stop circuit section of a motor.