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Hybrid stepper linear actuators
The linear actuators come in six sizes, from 21 mm square to 87 mm square corresponding to NEMA size 8, size 11, size 14, size 17, size 23, and size 34.  Each size has three designs available – captive, non-captive and an external linear version.  There are over twenty different travels per step available, from .00006 inch (.001524 mm) to .005 inch (.127 mm).
whole series products can be equipped with precise ball screws and encoder.

Hybrid stepper motor
The Hybrid stepper motors come in seven sizes, from 21 mm square to 87 mm square corresponding to NEMA size 8, size 11, size 14, size 17, size 23, size 24 and size 34.  Each size has different stack lengths available. Size 23, 24, 34 hybrid stepper have IP65 version available. All motors can be equipped with high resolution encoder and cable.

DC motor with gear box
We can offer spur gear box and  planetary gear box to most of our DC motor, several gear ratios are available for each size. We are happy to provide customized motor and gear box too.

PM stepper linear actuators
PM stepper linear actuators come in 3 sizes, 20mm, 25mm and 35mm. Each size has three designs available – captive, non-captive and an external linear version.The resolutions are available  from 0.00625mmper step to 0.333mm per step.The max thrust up to 115N.

PMDC motor

We offer both brush and brushless PMDC motors,the size is  from 31mm to 110mm. Equipped with modern electronic technology, the PMDC motors offer high power density and excellent controllability. The power can be from 5W to 1500W, the speed range is from 10rpm TO 10000RPM.

Hybrid stepper motor with gear box
We offer 5 sizes of geared hybrid stepper motor, from 20mm to 60mm. Each size has several stack length and different gear ratio available. All motors equipped with precise planetary gearbox, the gear ratio is from 3.3:1 to 99.5:1, the largest torque can be up to 250kgf.cm. Whole series products can be equipped with precise encoder.

Driver/encoder
We offer three types of stepper motor drivers, open loop, close loop and integrated version.
The standard encoders in stock have three versions, EK1, EK2 and EK3.
The driver and encoder can be used on whole series of stepper motor products.

Customized products
In addition to our standard configurations, we can custom build motors to meet your specific motion requirements. The in-house design and engineering team is available to assist you with a solution to fit your needs and your budget.
 

1.what materials are the lead screws and nut made from?
Generally, the screws are rolled from 303 stainless and the nuts are made from self-lubricating polyacetal. Other materials are available on a custom basis.

2.what are the benefits of  TFE coating?
The TFE coating increases nut life 3 to 4 times, it reduces friction between the nut and screw from .15 to .09, increases efficiency by 10% to 20%, improves smoothness and can reduce or eliminate noise. 


3.Are the leadscrew assemblies clean room compatible?
This depends on the class clean room the leadscrew will be used. It's acceptable to use most lead screw assemblies in a class 1000 clean room with no modifications. When using a TFE coating, Black Ice is specially designed to be used in these environment.

4.Can the leadscrew assemblies and slide products be used in a vacuum application?
It depends on your system requirements. Information is available for the standard acetal material used to indicate the weight reduction over time at certain temperature and vacuum. Since we have the manufacturing flexibility to make the nuts from various materials, it may be possible to use the materials that are known to be acceptable in your application and ensure compatibility. Please consult factory for more details.

5.What is backdriving?
Backdriving on leadscrew assemblies is the ability of a screw to be turned by a thrust load applied to the nut. Backdriving can occur when the tangent of the thread lead angle is greater than the coefficient of friction. Since this is difficult to measure, a good rule of thumb is that a screw will backdrive when the lead is greater than 1/3 the diameter on a non lubricated screw and greater than 1/4 the diameter on a lubricated screw.

6.Can the Leadscrew Assemblies be used in a harsh environments?
Since the Haydon Kerk leadscrew assemblies don't have any rolling elements, they are forgiving of many dust and dirt environments. The sliding friction allows operation in tough conditions such as paper handling, wood and metal routers, engravers and food processing

7.How much life can I expect from the assemblies?
For anti-backlash nuts, life is generally defined as the ability for the nut to compensate for wear. Otherwise, on a general purpose nut, its defined by the amount of wear that can be tolerated before the nut cannot hold the intended load or the clearance that develops is objectionable for the accuracy of the system. Life can be improved by the different nut styles we offer.

8.Are your motors UL, CSA, or CE approved?

No due the low voltage at which they operate UL, CSA, or CE are not required. However, many systems that have these approvals utilize our motors and ultimately get approved as a complete system.

9. The stepper motor seems to exhibit a lot of vibration in my application. What are some of the things I can do to correct it?

This could be resonance. In a Can-Stack motor the resonance range is 75 to 90 steps per second range and in the Hybrid motor within 140 to 200. Try starting your acceleration ramp at above these levels. Micro-stepping will also help through these ranges.

10.When should I use a Chopper drive over a L/R drive?
The Chopper drive will result in about 30% higher output force and can achieve faster speeds. The L/R drive would be better used in low voltage battery applications.

11.Explain the difference between the Captive , Non-captive, and external linear actuators?

The captive actuator has a built in anti-rotation mechanism through the use of a splined output shaft that allows it to extend and retract as a unit with no requirements for additional anti-rotation. The captive actuator is designed for shorter strokes.
The Non-captive actuator has a leadscrew going through the motor and has no reasonable stroke limits but must be attached to an assembly that will not rotate. This will then allow the leadscrew to extend and retract without rotating.
The External linear actuator uses a leadscrew and nut combination that extends out from the motor. Linear motion is created by the nut traversing back and forth as the leadscrew turns

12.Does the leadscrew rotate on a non-captive linear actuator?

No. Once one end of the leadscrew is secured to a non-rotating assembly that needs to be moved, it will actuate back and forth without rotating. Non-captive linear actuators a designed for longer stroke applications.

14.When used for positioning, does a stepper motor require a position feedback device?
The stepper motor is designed to achieve positioning open loop and normally does not need feedback. An optional encoder may be necessary when exact positioning must be known.

15.What is the performance difference between unipolar and bipolar wired motors?
The bipolar will have about 30% more torque and force than that of the unipolar unit per given input power. Bipolar is typically the motor of choice.

16.What is the difference between a 4 wire and 6 wire stepper motor?

The 4 wire motor is a "bipolar" which means two coils. In its operation two coils are on at any given time and current is reversed in the coils to achieve rotation. The 6 wire motor is a "unipolar" device with four coils with the commons are tied together in each phase and brought out.

17.What is static torque and pull-out torque?
Static torque or pull-in torque is the amount of torque that a motor can overcome when starting from rest. Pull-out torque is the amount of torque it takes to stall the motor after it is running at speed.

18.Can I run the linear actuator into a hard stop?

This is not recommended on the finer pitch resolutions due to the high forces generated which may cause lock-up. It is possible however under reduced power input.

19.Will I need to re-lubricate the leadscrew or shaft on the linear actuator?
The linear actuators are lubricated by the factory for the life of the product and do not need re-lubrication under normal operating circumstances

20.Can the linear actuator be back-driven when the power is removed?
This depends on the thread lead of the leadscrew. Fine pitches will not back-drive, while course pitches will.

21.How much backlash can I expect from a linear actuator?
Is there any way to compensate for it?
Typical backlash can be between .001" to .005" depending on the leadscrew pitch.
Backlash can be compensated by using our optional Integrated or  External Anti-Backlash nuts.

22.If I use micro-stepping, will the accuracy of my system improve?
What about the torque/force output?
No, if may even get worse as the rotor is now resting between poles. To improve the accuracy an encoder is required.
The torque/force will be reduced by approximately be 20% to 30%

23.I'm running the motor/actuator intermittently. Can I temporarily over drive the it for more torque/force output without damaging it?
Yes. You can apply twice the rated voltage using a L/R drive and twice the rated current using a Chopper drive. However you should limit it to a max 25% duty cycle with a 75% off time.

24.My stepper motor/actuator appears to get extremely hot when in the static or holding position. Is this normal?
With rated current as holding current, the motor/actuator will have a 75c degree rise. This is indeed very hot, but normal. The motor/actuator has a class B insulation system (130c degree) rating. To minimize the heat rise try reducing the holding current 0.25 times the rated current 

25.Do your motors have IP ratings?
Our standard motors are not IP rated although they may be customized to meet certain IP number ratings

26.What is the straightness of the leadscrews?
Our standard straightness for all screw up to 4 feet long is .003" per foot. We can hold a tighter tolerance and in some cases up to .001" per foot depending on the diameter and length.

27.What is the maximum speed of the leadscrews?
Maximum speed is related to standard critical speed graphs. It is based on the diameter of the screw, the bearing end supports, and the length of unsupported screw. A convenient chart can be found in our catalog and on our web-site.

28.What is the design load rating of the nut?

The design load rating of the nut is the axial force applied to the nut during operation. The maximum force consisting of the mass being moved, while considering the effect of acceleration and deceleration, should not be exceeded. The design load rating relates to nut life, anti-backlash, and wear compensation

29.What is the standard operating temperature range of the assemblies?
Our standard temperature range is 32F to 200F (0 to 90C). For applications where your temperature will be higher and lower than this, other materials are available to meet your requirements including Kerkite which can be used in a -50C to +150C temperature range

Hybrid stepper linear actuators non captive

Hybrid stepper linear actuators external

Hybrid stepper linear actuators captive

 

Hybrid stepper linear actuators kaptive


Hollow shaft hybrid stepper

Anti backlash nut assembly

Kaptive PM linear actuator

Non-captive PM linear actuator

External PM linear actuator

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