20 mm Micro stepper motor can be matched with gearbox

Short Description:

Model No. 20BY45
Motor type Bipolar Micro  stepper motor
Step angle 18°/step
Motor size 20mm
No. of phases 2 phases
Minimum order quantity 1unit

Product Detail

Product Tags


This permanent magnet stepper motor is 20mm in diameter, has a torque of 60gf.cm, and can reach a maximum speed of 3000rpm.
This motor can also be added to the gearbox, the motor step angle is 18 degrees, that is, 20 steps per revolution. When the gearbox is added, the motor deceleration effect rotation angle resolution can reach 0.05~6 degrees. Applicable to many needs, precise control of the rotation position.
The coil resistance of the motor is 9Ω/phase, and it is designed for low drive voltage (about 5V DC). If the customer wants to drive the motor at higher voltage, we can adjust the coil resistance to match it.
In addition, there are two M2 screws on the cover of the motor, they are used to fix with the gear box. Customers can also use the screws to fix this motor to other parts.
Its connector is 2.0mm pitch (PHR-4), and we can change it to another type if the customer wants to.
Therefore, this product can be used where precise position control is required. It can be generally used in medical equipment, printers, automation equipment, robots, etc.

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Motor type Bipolar Micro stepper motor
No.of Phase 2 Phase
Step Angle 18°/step
Winding Resistance(25℃) 10Ωor 31Ω/phase
Voltage 6V DC
Driving mode 2-2
Max starting frequency 900Hz(Min)
Max response frequency 1200Hz(Min)
Pull-out torque 25g.cm(600 PPS)

Design drawing

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Torque VS.Frequency diagram

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Application of Hybrid stepper motor

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Features & Advantage

1. High precision positioning
Since steppers move in precise repeatable steps, they excel in applications requiring precise
positioning, by the number of steps the motor moves
2. High Precision speed control
Precise increments of movement also allow for excellent control of rotational speed for process
automation and robotics. The rotational speed is determined by the frequency of the pulses.
3. Pause and holding function
With control of the drive, the motor has lock function (there is current through motor windings, but
the motor does not rotate), and there is still a holding torque output.
4. Long life & low electromagnetic interference
The stepper motor has no brushes, and does not need to be commutated by brushes like a brushed
DC motor. There is no friction of the brushes, which increases the service life, has no electric sparks, and reduces electromagnetic interference.

Application of Micro stepper motor

Textile machinery
Industrial control
Air conditioning

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Working principle of stepper motor

The drive of the stepper motor is controlled by software. When the motor needs to rotate, drive will
apply the stepper motor pulses. These pulses energize stepper motor's in a specified order, thereby
causing the motor's rotor to rotate in a specified direction (clockwise or counter clockwise). So as to
realize proper rotation of the motor. Each time the motor receives a pulse from the driver, it will rotate by a step angle (with full-step drive), and the rotation angle of the motor is determined by the number of driven pulses and step angle.

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.


Samples are packed in foam sponge with a paper box, shipped by express
Mass production, motors are packed in corrugated cartons with transparent film outside. (shipping by air)
If shipped by sea, product will be packed on pallets

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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)

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