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Geared Stepper Motors

Charactertistic Comparison for Geared Stepper Motors

  Type

Features

Principle and Structure

Low Backlash

Taper Hobbed Gear (TH)

TH Geared
(Parallel Shaft)

Taper Hobbed Gear (TH)

A wide variety of low gear ratios, high-speed operation

Backlash: 10 ~ 60 arc minute (0.167º ~ 1º)

Gear ratios: 3.6:1, 7.2:1, 10:1, 20:1, 30:1

Frame sizes: 1.10 in., 1.65 in., 2.36 in. and 3.54 in.

Available Products:

TH Geared

Taper Hobbed Stepper Motor GearWith the TH geared type, tapered gears are used for the spur gear's speed-reduction mechanism and the meshing gear. The tapered gear is produced through continuous profile shifting toward the shaft. The tapered gears are adjusted in the direction of the arrows, as shown in the figure, to reduce backlash.

Planetary Gear (PL/PS)
PL Geared
(Planetary)

Planetary Gear (PL)

High permissible torque

Centered output shaft

Backlash: 20 ~ 25 arc min (0.33º ~ 0.58º)

Gear ratios: 5:1, 10:1, 36:1

Frame sizes: 1.65 in. and 2.36 in.

Available Products:

 

 

 

PL Geared

Planetary Gear Stepper MotorPlanetary Gear Stepper Motor

The PL gear mechanism is comprised primarily of a sun gear, planetary gears and an internal tooth gear. The sun gear is installed on the central axis surrounded by planetary gears enclosed in an internal tooth gear centered on the central axis.

Planetary Gear (PS)

PS Geared
(Planetary)

Planetary Gear (PS)

High permissible torque / maximum torque

High resolution

Low backlash with center shaft

Backlash: 15 ~ 25 arc min (0.25º ~ 0.42º)

Gear ratios: 5:1, 7.2:1, 10:1, 25:1, 36:1 and 50:1

Frame Sizes: 1.65 in., 2.36 in. and 3.54 in.

Available Products:

PS Geared

Planetary Gear Stepper Motor

The PS gear mechanism is comprised primarily of a sun gear, planetary gears and an internal tooth gear. The sun gear is installed on the central axis surrounded by planetary gears enclosed in an internal tooth gear centered on the central axis.

Non-backlash Planetary Gear (PN)
PN Geared
(Planetary)

Planetary Gear (PN)

High speed (low gear ratio), high accuracy positioning

High permissible / maximum torque

A wide variety of gear ratios for selecting the desired step angle (resolution)

Centered output shaft

Backlash: 2 ~ 3 arc min (0.034º ~ 0.05º)

Gear ratios: 5:1, 7.2:1, 10:1, 25:1, 36:1, 50:1

Frame sizes: 1.10 in., 1.65 in., 2.36 in. and 3.54 in.

Available Products:

PN Gear
Planetary Gear for Stepper MotorsThe PN gear employs a planetary gear speed-reduction mechanism. The PN gear achieves the specified backlash of three arc minutes through the improved accuracy of its components and the backlash-elimination mechanism. That mechanism is comprised of two sets of internal and planetary gears on the upper and lower levels with the internal gears and planetary gears reduce clockwise backlash; the lower-level internal gears and planetary gears reduce counterclockwise backlash.

Harmonic Gear (HG)
HG Geared
(Harmonic Drive)

Harmonic Gear (HG)

High accuracy positioning

High permissible / maximum torque

High gear ratios, high resolution

Centered output shaft

Backlash: 0 arc min

Gear ratios: 50:1, 100:1

Frame sizes: 0.79 in., 1.65 in., 2.36 in. and 3.54 in.

Available Products:

 

HG Geared

Harmonic Gear for Stepper Motors

Combines three basic parts. The flex spline is bent into an oval shape by the wave generator. The teeth at the long axis of the oval mesh with the circular spline, while the teeth at the short axis of the oval are completely separate from it.

HG

Rotating the wave generator (input) clockwise while keeping the circular spline fixed in position will subject the flax spline to elastic deformation, causing a gradual shift in the point of engagement between the circular spline and flex spline.

HG

When the wave generator completes one revolution, the flex spline has rotated two fewer teeth than the circular spline has, resulting in the movement of the flex spline for the difference in the tooth count (two teeth) in the opposite direction of the wave generator's rotation (i.e. counterclockwise). This movement translates into output, thereby reducing the speed.

 

Basic Spur Gear (SH)
SH Geared
(Parallel Shaft)

Spur Gear (SH)

A wide variety of low gear ratios

Backlash: 1° to 2°

Gear ratios: 3.6:1, 7.2:1, 9:1, 10:1, 18:1, 36:1

Frame sizes: 1.10 in., 1.65 in., 2.36 in. and 3.54 in.

Available Products:

SH Geared

The SH geared type is for use with 2-phase stepping motors when it is necessary to reduce reflected inertia, increase the output torque or increase the speed of the motor to avoid vibration.

 


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