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Smooth Drive Function for Enhanced Ease of Use

The Smooth Drive Function automatically controls operations via microstep drive at the same travel distance and speed used in the full-step mode, without requiring the operator to change the pulse input settings. This function is particularly useful when the CRK Series is used in full-step or half-step mode.

Motor Features

• Lower Vibration
• Increased Position Accuracy
• Higher Resolution

Newly Designed Motors

High-Torque Motor

The high-resolution type and high-torque type adopt a newly designed high-torque motor that widens the range of applications.
- The smaller motor allows for compact equipment design.
- The motor current is reduced to suppress heat generation.

Standard Motor

The basic model in the CRK Series offering an optimal balance of torque, low vibration and low noise.

Planetary (PN) Geared

A high-accuracy geared motor achieving a backlash of 3 arc minutes or less. It also provides high strength and wide gear ratios.
• Backlash: 2 ~ 3 arc minute

Tapered Hob (TH) Geared

A geared motor achieving both low backlash and low cost.
• Backlash: 10 ~ 60 arc minute

Harmonic (HG) Geared

A high-accuracy, backlash-free geared motor adopting a newly developed harmonic gear. It ensures high strength in a compact body.
•Backlash: 0 arc minute

Compact, Lightweight Microstepping Driver

The driver in the CRK Series achieves microstep drive in a compact, lightweight body. A new IC allows the driver to provide various functions, including the following:

• Smooth Drive Function
• 1-pulse/2-pulse input mode switching
• 25 preset step angles
• Power LED
• Photocoupler input

The compact, lightweight driver in the CRK Series is approximately 45% smaller than a conventional full-step driver.

Lower Vibration and Noise Achieved by Microstep Drive

The basic step angle of the motor can be divided into a maximum of 250 microstep angles without using any mechanical element such as a reduction gear. As a result, vibration and noise are further reduced.

Improved Performance can Usually be Easily Integrated into an Existing 2-Phase System

The basic step angle can be adjusted to match a 2-phase stepping motor's step angles, so a switchover from the 2-phase microstep mode can be easily made without having to change input pulses.

RoHS Compliant

RoHS (Restriction of Hazardous Substances) Directive:
Directive on restriction of the use of certain hazardous substances in electrical and electronic equipment (2002/95/EC).
The RoHS Directive prohibits the use of six chemical substances in electrical and electronic products sold in the EU member states. The six controlled substances are: lead, hexavalent chromium, cadmium, mercury and two specific brominated flame-retardants (PBB and PBDE).

Also Available

Product Lineup

Type		Features	Motor Frame Size	Basic Step Angle	Max. Holding Torque
High-Torque		A high torque motor generating high torque of approx. 1.3 to 1.5 times the level achieved by the standard type.	0.79 in (20 mm)	0.72°	3.2 oz-in (0.0231 N·m)
			1.10 in. (28 mm)		6.8 ~ 11 oz-in (0.048 ~ 0.078 N·m)
			1.65 in. (42 mm)		34 ~ 59 oz-in (0.24 ~ 0.42 N·m)
High-Resolution		A high-torque motor offering higher positioning accuracy with the basic step angle set to 0.36°/step, or half the basic step angle of the standard type.	1.10 in. (28 mm)	0.36°	5.9 ~ 12.7 oz-in (0.042 ~ 0.09 N·m)
			1.65 in. (42 mm)		34 ~ 59 oz-in (0.24 ~ 0.42 N·m)
			2.36 in. (60 mm)		110 ~ 320 oz-in (0.78 ~ 2.3 N·m)
Standard		The basic model in the CRK Series offering an optimal balance of torque, low vibration and low noise.	1.65 in. (42 mm)	0.72°	18.4 ~ 34 oz-in (0.13 ~ 0.24 N·m)
			2.36 in. (60 mm)		59 ~ 230 oz-in (0.42 ~ 1.66 N·m)
	TH Geared	A geared motor achieving both low backlash and low cost. • Backlash: 10 ~ 60 arc minute	1.10 in. (28 mm)	0.024° - 0.1°	28 ~ 71 oz-in (0.2 ~ 0.5 N·m)
			1.65 in. (42 mm)	0.024° - 0.2°	3 ~ 13.2 lb-in (0.35 ~ 1.5 N·m)
			2.36 in. (60 mm)		11 ~ 35 lb-in (1.25 ~ 4 N·m)
	PN Geared	A high-accuracy geared motor achieving a backlash of 3 arc minutes or less. It also provides high strength and wide gear ratios. • Backlash: 2 ~ 3 arc minute	1.10 in. (28 mm)	0.072° - 0.144°	28 ~ 56 oz-in (0.2 ~ 0.4 N·m)
			1.65 in. (42 mm)		7 ~ 13.2 lb-in (0.8 ~ 1.5 N·m)
			2.36 in. (60 mm)	0.0144° - 0.144°	30 ~ 70 lb-in (3.5 ~ 8 N·m)
	HG Geared	A high-accuracy, backlash-free geared motor adopting a newly developed harmonic gear. It ensures high strength in a compact body. •Backlash: 0 arc minute	0.79 in. (20 mm)	0.0072°, 0.0144°	3.5 ~ 5.3 lb-in (0.4 ~ 0.6 N·m)
			1.65 in. (42 mm)		30 ~ 44 lb-in (3.5 ~ 5 N·m)
			2.36 in. (60 mm)		48 ~ 70 lb-in (5.5 ~ 8 N·m)