NEMA8 20mm hybrid stepper motor 1.8 degree step angle D shaft

Short Description:

Model No.	20HS
Motor type	hybrid stepper motor
Step angle	1.8°/step
Motor size	14mm(NEMA 6)
No. of phases	2 phases (bipolar)
Rated current	0.6~0.8A/phase
Motor length	30~42mm
Minimum order quantity	1unit

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Description

This NEMA8 motor is a 20 mm size hybrid stepper motor.
This motor is a high-precision, small-size hybrid stepping motor with beautiful appearance and excellent performance.
The step angle is 1.8°, which means it takes 200 steps to make one revolution.
Motor lengths are 30mm, 38mm and 42mm, the longer the motor length, the higher the torque.
The 42mm has more torque while the 30mm has a smaller size.
Customers can choose the length according to their torque and space requirements.
Also, we offer customization service.
Customers choose the parameters below according to their needs. Please feel free to contact us with any questions about the motor, and we will provide more professional support.

Parameters

Step Angle (°)	Motor length (mm)	Holding torque (g*cm)	Current /phase (A/phase)	Resistance (Ω/phase)	Inductance (mH/phase)	No. of leads	Rotational inertia (g*cm²)	Weight (KG)
1.8	30	180	0.6	6.5	1.7	4	1.6	0.06
1.8	38	300	0.6	10	2.5	4	2.2	0.08
1.8	42	300	0.8	5.4	1.5	4	2.9	0.06

Above parameters are standard products for reference, motor can be customized based on customer's requirement.

Design drawing

Basic structure of NEMA stepper motors

Application of Hybrid stepper motor

Due to high resolution of hybrid stepper motor’s (200 or 400 steps per revolution), they are widely used for applications requiring high precision, such as:
3D printing
Industrial control(CNC, automatic milling machine, textile machinery)
Computer peripherals
Packing machine
And other automatic systems requiring high precision control.

ApplicationNotes about hybrid stepper motors

Customers should follow the principle of “selecting stepper motors first, then select driver based on existing stepper motor”
It is best not to use the full-step driving mode to drive a hybrid stepping motor, and the vibration is bigger under full-step driving.
Hybrid stepper motor is more suitable for low-speed occasions. We suggest the speed does not exceed 1000 rpm (6666PPS at 0.9 degrees), preferably between 1000-3000PPS (0.9 degrees), and it can be attached with a gearbox to lower it’s speed. The motor has high working efficiency and low noise at suitable frequency.
Due to historical reasons, only the motor with a nominal 12V voltage uses 12V. Other rated voltage on design drawing is not exactly the most suitable driving voltage for the motor. Customers should choose suitable driving voltage and suitable driver based on own requirement.
When the motor is used with high speed or large load, it generally does not start at the working speed directly. We suggest to gradually increases the frequency and speed. For two reasons: First, the motor does not lose steps, and second, it can reduce noise and improve the positioning accuracy.
The motor should not work in the vibration area(below 600 PPS ). If it must be used at slow speed, vibration problem could be reduced by changing the voltage, current or adding some damping.
When the motor works below 600PPS (0.9 degrees), it should be driven by small current, large inductance and low voltage.
For loads with a large moment of inertia, a large size motor should be selected.
When higher precision is required, it could be solved by adding gearbox, increasing the motor speed, or using subdivision driving. Also a 5-phase motor(unipolar motor) could be used, but the price of the entire system is relatively expensive, so it’s rarely used.
Stepper motor size:
We currently have 20mm(NEMA8), 28mm(NEMA11), 35mm(NEMA14), 42mm(NEMA17), 57mm(NEMA23), 86mm(NEMA34) hybrid stepper motors. We suggest to determine motor size first, then confirm other parameter, when you select a hybrid stepper motor.

Customization service

Motor’s design can be adjusted based on customer’s requirement including:
Motor’s diameter: we have 6mm, 8mm, 10mm, 15mm and 20 mm diameter motor
Coil resistance/ rated voltage: coil resistance is adjustable, and with higher resistance, motor’s rated voltage is higher.
Bracket design/ lead screw length: if customer want the bracket to be longer/short, with special design such as mounting holes, it’s adjustable.
PCB + cables + connector: PCB’s design, cable length and connector pitch are all adjustable, they can be replaced into FPC if customers require.

Lead Time

If we have samples in stock, we can ship out samples in 3 days.
If we do not have samples in stock, we need to produce them, production time is about 20 calendar days.
For mass production, lead time depends on order quantity.

Payment method and payment terms

For samples, in general we accept Paypal or alibaba.
For mass production, we accept T/T payment.
For samples, we collect full payment before production.
For mass production, we can accept 50% pre-payment before production, and collect the rest 50% payment before shipment.
After we cooperate order more than 6 times, we could negotiate other payment terms such as A/S (after sight)

FAQ

1.How long is the general delivery time for samples? How long is the delivery time for back-end large orders?
Sample order lead-time is about 15 days,mass quantity order lead -time is 25-30 days.

2. Do you accept custom services?
We accept products customize.including the motor parameter,lead wire type,out shaft etc.

3. Is it possible to add an encoder to this motor?
For this type motor, we can adding encoder on the motor wear cap.

Frequently Asked Question

1.How to reduce the heat of the stepper motor：
Reduce heat generation is to reduce copper loss and iron loss. Reduce copper loss in two directions, reduce resistance and current, which requires the selection of small resistance and rated current as small as possible when the motor, the two-phase motor, can use the motor in series without parallel motor. But this often contradicts the requirements of torque and high speed. For the selected motor, the drive's automatic half-current control function and offline function should be fully utilized, the former automatically reduces the current when the motor is at rest, and the latter simply cuts off the current. In addition, the subdivision drive, because the current waveform is close to sinusoidal, less harmonics, motor heating will also be less. There are few ways to reduce iron loss, and the voltage level is related to it. Although a motor driven by high voltage will bring an increase in high-speed characteristics, it also brings an increase in heat generation. So we should choose the right drive voltage level, taking into account the high speed, smoothness and heat, noise and other indicators.

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