Month: May 2018

An overview of the nema 42 high torque stepper motor

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The 42K Series High Torque Stepper Motors use advanced magnetic technologies to provide significantly higher torque levels than what is available in standard round motors. NEMA 42 stepper motor is the largest nema size in the market. It uses advanced magnetic material to provide the highest torque density with the least vibration and noise level. When integrated with an encoder, the nema 42 high torque stepper motor generate make it possible for them to become a more affordable alternative to brushless servo motor in large motion control applications. Inherently, every stepper has flux leakage which equates to torque loss. By inserting magnetic pins within the rotor, we were able to mitigate flux leakage, resulting in improved torque by up to 40%.

nema 42 stepper motor dimenstions

42K

NEMA 42 Frame Size

1.8° Natural Step Angle

Holding Torque Ratings Up to 5700 oz.in.

Substantial Increase In Torque Over Standard Torque Motors

High Acceleration and Increased Rotor Inertia

3 Stack Lengths

1.5% Typical Step Accuracy – Noncumulative

Rugged Construction

Higher Temperature Characteristics

CE Certified and RoHS Compliant

NEMA 42 stepper motor speed torque curve

These motors are available in a variety of windings to meet any application-specific requirement. Motor shaft and mounting holes can be custom engineered to meet your application needs. The big nema 42 stepper motors are optimized for micro stepping driver and have excellent dynamic performance. In addition to the below existing models, it can custom design the motor to meet customer’s voltage, current, speed and mounting requirement. And we oyostepper also provides a wide range of gearboxes for nema 34 stepper motors for sale and nema 42 stepper motors for sale for high torque and low RPM needs.

 

 

Advantages and features of Geared Stepper Motors

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Geared stepper motors are perfect solutions for low speed and high torque positioning applications. Generally speaking, a stepper motor features greater output torque than an AC motor of the same frame size. At a given torque, the smaller displacement (torsion angle) means higher rigidity. For example, the AS66AAE-T7.2 geared motor receives backlash effects at a light load of 0.1 N・m torsional torque, but becomes less prone to twisting than the AS98AAE as the torsion increases. The AS66AAE-N5 motor receives little in the way of backlash effects at a light load, and maintains high rigidity throughout the entire torque range.

geared stepper motor for sale

   

 About its features

  • Precision

Unlike conventional spur gears, the harmonic gear reduction stepper motor  is able of averaging the effects of tooth pitch errors and accumulated pitch errors to the rotational accuracy, thus achieving highly accurate, non-backlash performance. However, the gear’s own torsion may become the cause of a problem when performing ultra-high accuracy positioning of two arc minutes or less. When using a harmonic gear for ultra-high accuracy positioning, remember the following three points.

  • Lost Motion

Lost motion is the total value of the displacement produced when about 5% of permissible torque is applied to the gear’s output shaft. Since harmonic gears have no backlash, the measure indicating the gear’s accuracy is represented as lost motion.

  • Hysteresis LossWhen torsion torque is gradually applied to the gear output shaft until it reaches the permissible torque in the clockwise or counterclockwise direction, the torsion angle will become smaller as the torque is reduced. However, the torsion angle never reaches 0, even when fully returned to its initial level. This is referred to as “hysteresis loss,” as shown by B-B’ in the figure. Harmonic gears are designed to have a hysteresis loss of less than two minutes. When positioning in the clockwise or counterclockwise direction, this hysteresis loss occurs even with a friction coefficient of 0. When positioning to two minutes or less, positioning must be done in a single direction.
  • stepper motorAbout its advantages
  • High Rigidity—It will be made like the motor less prone to the effects of fluctuation in friction load, and with the stepper motor for sale whose power on, the output shaft is subjected to torsion applied externally to measure the amount of displacement (torsion angle) for comparison of rigidity.
  • Low vibration—To further explain these four purposes using examples, comparisons will be made below between a standard type motor and a geared motor, both of which have similar output torque and permissible torque. If no problem exists in terms of speed, the standard type motor may be replaced by the geared motor.

 

How Much Information Do You Know About the Stepper Motor?

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A stepper motor or step motor or stepping motor is a brushless DC electric motor that divides a full rotation into a number of equal steps. The motor’s position can then be commanded to move and hold at one of these steps without any position sensor for feedback (an open-loop controller), as long as the motor is carefully sized to the application in respect to torque and speed. Switched reluctance motors are very large stepping motors with a reduced pole count, and generally are closed-loop commutated. Switched reluctance motors are very large stepping motors with a reduced pole count, and generally are closed-loop commutated. To make the motor shaft turn, first, one electromagnet is given power, which magnetically attracts the gear’s teeth. When the gear’s teeth are aligned to the first electromagnet, they are slightly offset from the next electromagnet.

This means that when the next electromagnet is turned on and the first is turned off, the gear rotates slightly to align with the next one. From there the process is repeated. Stepper motor for sale effectively has multiple “toothed” electromagnets arranged around a central gear-shaped piece of iron. The electromagnets are energized by an external driver circuit or a micro controller. Each of those rotations is called a “step”, with an integer number of steps making a full rotation. In that way, the motor can be turned by a precise angle. Motion Control, in electronic terms, means to accurately control the movement of an object based on either speed, distance, load, inertia or a combination of all these factors. There are numerous types of motion control systems, including; Stepper Motor, Linear Step Motor, DC Brush, Brushless, Servo, Brushless Servo and more.

Dual Shaft Nema 34 CNC Stepper Motor 8.5Nm (34HS46-5004D) 5A 86x114mmThis document will concentrate on Step Motor technology. Permanent magnet and hybrid stepper motors are two types of the most commonly used stepper motors. Sometimes, it’s difficult to know which type of stepper motor is the best choice for your project. For this reason, we have provided detailed information to help engineers determine the best motor for their application requirements. Follow our convenient step motor guide to learn the basics of hybrid stepper motor engineering and find out why this type of motor can be so beneficial to your project. Typically, step angles for a hybrid stepper motor range from 200 to 400 steps per revolution. This type of motor provides a combination of the best features available on both the PM and VR types of stepper motors.

A motor that has known detent positions where the rotor will stop with the proper control in some cases. The digitally controlled motor moves the head positioner from track to track in small, step-like motions. And the hybrid stepper motor provides excellent performance in areas of torque, speed, and step resolution. The word Hybrid means combination or mixture. The shaft of a stepper motor rotates in discrete step increments when electrical command pulses are applied to it in the proper sequence. HB Stepper motors are the easiest devices for precise positioning control. They are widely being used in various applications for position and speed via all kinds of control signals such as digital, analog, communication etc. HB motors come in different types including the basic type, encoder type, IP65 type, Integrated type with drive and controller, brake type and geared type.

The way to prevent stepper motor losing step

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Stepper motor is an open-loop control motor which transforms electric pulse signal into angular displacement or linear displacement. In the case of no step losses, the motor speed and stop position depend on the pulse signal frequency and the pulse count instead of the variation of the load. When the stepper motor receives a pulse signal, the motor will rotate a fixed angle (step angle) according to the setting direction.

How to prevent stepper motor losing step?

Actually, the reason for the stepper motor losing step is essentially the improper choice of stepper motor driver. Only by choosing the right and appropriate stepper motor driver can the stepper motor exert its precise control advantages. Selecting the right stepper motor driver requires a driver greater than or equal to the current according to the current of the motor. If a low vibration or high accuracy is required, a subdivided drive can be used. For large torque motor, high voltage type actuator is used as far as possible to obtain good high speed performance.

At the same time for the driver, many people directly use the switching mode power supply as the drive power supply. However, it is generally better not to use switching power supply, especially for the high torque stepper motor, unless switching power supply is more than twice as much as the required power. When the motor works, it is a large inductance load, the power supply will form instantaneous high pressure. The switching power supply overload performance is not good and it will protect the shutdown. And its precise voltage stabilization performance is not needed. Sometimes it may cause the switching power supply and the drive damage. For the driving power of the stepping motor, the DC power supply can be replaced by the conventional toroidal or R transformer.

The production of the hybrid stepper motor resonance is that the pulse frequency of the motor is equal to the natural frequency of the stepper motor, and the frequency is related to the subdivision of the driver. When we use stepper motor, the subdivision ability of the actuator is very important. The smaller the resonance range is, the better is. The large load interia is caused by the overload of stepper motor. Aimed at this situation, we should avoid the motor overload in the use.

Industrial Applications of NEMA 42 Stepper Motor

Three different ways to drive bipolar stepper motor

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A bipolar stepper motor for sale has one winding per stator phase. A two phase bipolar stepper motor will have 4 leads. In a bipolar stepper we don’t have a common lead like in a uni-polar stepper motor. Hence, there is no natural reversal of current direction through the winding.

Three different ways to drive bipolar stepper motor

1. Only one of the phase winding are energized at a time. That is, either AB or CD is energized. Of course the coils will be energized in such a way that we get correct polarity. But only one phase is energized. This type of stepping will give less holding torque because only one phase is energized.

2.In this method, both the phases are activated at the same time. The rotor will align itself between two poles. This arrangement will give higher holding torque than the previous method.

3.The third method is used for half stepping. This method is used generally to improve the stepping angle. Here, in step 1 only 1 phase is ON, then in step 2, 2 phases are ON, then again only one phase is ON and the sequence continues.

Three different ways to drive bipolar stepper motor

Some differences between bipolar and unipolar stepper motor