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Datasheet

Variants

FAULHABER Stepper Motors

Series AM0820

Two phase, 20 steps per revolution

Key Features

Holding torque at boosted current:

1 mNm

Step angle (full step):

18 °

Diameter:

8 mm

Length:

13.8 mm

Advantages

Cost effective positioning drive without encoder

High power density

Very high acceleration

Extremely fast change of direction possible

Long-lasting

Wide operating temperature range

Full-, half- and micro-stepping operation possible

Extremely low rotor inertia

Variants:

Values at 22° and nominal voltage		Value
Nominal current per phase (both phases ON)		0.225 A
Boosted current per phase (both phases ON)		0.45 A
Phase resistance		7.3 Ω
Phase inductance (1 kHz)		1.4 mH
Holding torque (at nominal current in both phases)		0.65 mNm
Holding torque at boosted current		1 mNm
Residual torque, typ.		0.13 mNm
Back-EMF amplitude		0.8 V/k step/s
Electrical time constant		0.21 ms
Rotor inertia		2.75 ·10⁻⁹ kgm²
Step angle (full step)		18 °
Angular accuracy		10 %
Angular acceleration, max.		363 ·10³ rad/s²
Resonance frequency (at no load)		75 Hz
Thermal resistance		4.1 / 65.3 K/W
Thermal time constant		3.5 / 160 s
Operating temperature range		-30 ... 70 °C
Winding temperature, max.		130 °C
Housing material		aluminium, black anodized
Mass		3.3 g
Magnet material		NdFeB

Values at 22° and nominal voltage		Value
Nominal current per phase (both phases ON)		0.15 A
Boosted current per phase (both phases ON)		0.3 A
Phase resistance		18 Ω
Phase inductance (1 kHz)		3.9 mH
Holding torque (at nominal current in both phases)		0.65 mNm
Holding torque at boosted current		1 mNm
Residual torque, typ.		0.13 mNm
Back-EMF amplitude		1.3 V/k step/s
Electrical time constant		0.21 ms
Rotor inertia		2.75 ·10⁻⁹ kgm²
Step angle (full step)		18 °
Angular accuracy		10 %
Angular acceleration, max.		363 ·10³ rad/s²
Resonance frequency (at no load)		75 Hz
Thermal resistance		4.1 / 65.3 K/W
Thermal time constant		3.5 / 160 s
Operating temperature range		-30 ... 70 °C
Winding temperature, max.		130 °C
Housing material		aluminium, black anodized
Mass		3.3 g
Magnet material		NdFeB

Values at 22° and nominal voltage		Value
Nominal current per phase (both phases ON)		0.08 A
Boosted current per phase (both phases ON)		0.16 A
Phase resistance		56 Ω
Phase inductance (1 kHz)		12.6 mH
Holding torque (at nominal current in both phases)		0.65 mNm
Holding torque at boosted current		1 mNm
Residual torque, typ.		0.13 mNm
Back-EMF amplitude		2.4 V/k step/s
Electrical time constant		0.21 ms
Rotor inertia		2.75 ·10⁻⁹ kgm²
Step angle (full step)		18 °
Angular accuracy		10 %
Angular acceleration, max.		363 ·10³ rad/s²
Resonance frequency (at no load)		75 Hz
Thermal resistance		4.1 / 65.3 K/W
Thermal time constant		3.5 / 160 s
Operating temperature range		-30 ... 70 °C
Winding temperature, max.		130 °C
Housing material		aluminium, black anodized
Mass		3.3 g
Magnet material		NdFeB

Values at 22° and nominal voltage		Value
Nominal current per phase (both phases ON)		0.225 A
Boosted current per phase (both phases ON)		0.45 A
Phase resistance		7.3 Ω
Phase inductance (1 kHz)		1.4 mH
Holding torque (at nominal current in both phases)		0.65 mNm
Holding torque at boosted current		1 mNm
Residual torque, typ.		0.13 mNm
Back-EMF amplitude		0.8 V/k step/s
Electrical time constant		0.21 ms
Rotor inertia		2.75 ·10⁻⁹ kgm²
Step angle (full step)		18 °
Angular accuracy		10 %
Angular acceleration, max.		363 ·10³ rad/s²
Resonance frequency (at no load)		75 Hz
Thermal resistance		4.1 / 65.3 K/W
Thermal time constant		3.5 / 160 s
Operating temperature range		-30 ... 70 °C
Winding temperature, max.		130 °C
Housing material		aluminium, black anodized
Mass		3.3 g
Magnet material		NdFeB

Values at 22° and nominal voltage		Value
Nominal current per phase (both phases ON)		0.15 A
Boosted current per phase (both phases ON)		0.3 A
Phase resistance		18 Ω
Phase inductance (1 kHz)		3.9 mH
Holding torque (at nominal current in both phases)		0.65 mNm
Holding torque at boosted current		1 mNm
Residual torque, typ.		0.13 mNm
Back-EMF amplitude		1.3 V/k step/s
Electrical time constant		0.21 ms
Rotor inertia		2.75 ·10⁻⁹ kgm²
Step angle (full step)		18 °
Angular accuracy		10 %
Angular acceleration, max.		363 ·10³ rad/s²
Resonance frequency (at no load)		75 Hz
Thermal resistance		4.1 / 65.3 K/W
Thermal time constant		3.5 / 160 s
Operating temperature range		-30 ... 70 °C
Winding temperature, max.		130 °C
Housing material		aluminium, black anodized
Mass		3.3 g
Magnet material		NdFeB

Values at 22° and nominal voltage		Value
Nominal current per phase (both phases ON)		0.08 A
Boosted current per phase (both phases ON)		0.16 A
Phase resistance		56 Ω
Phase inductance (1 kHz)		12.6 mH
Holding torque (at nominal current in both phases)		0.65 mNm
Holding torque at boosted current		1 mNm
Residual torque, typ.		0.13 mNm
Back-EMF amplitude		2.4 V/k step/s
Electrical time constant		0.21 ms
Rotor inertia		2.75 ·10⁻⁹ kgm²
Step angle (full step)		18 °
Angular accuracy		10 %
Angular acceleration, max.		363 ·10³ rad/s²
Resonance frequency (at no load)		75 Hz
Thermal resistance		4.1 / 65.3 K/W
Thermal time constant		3.5 / 160 s
Operating temperature range		-30 ... 70 °C
Winding temperature, max.		130 °C
Housing material		aluminium, black anodized
Mass		3.3 g
Magnet material		NdFeB

Values at 22° and nominal voltage		Value
Nominal current per phase (both phases ON)		0.225 A
Boosted current per phase (both phases ON)		0.45 A
Phase resistance		7.3 Ω
Phase inductance (1 kHz)		1.4 mH
Holding torque (at nominal current in both phases)		0.65 mNm
Holding torque at boosted current		1 mNm
Residual torque, typ.		0.13 mNm
Back-EMF amplitude		0.8 V/k step/s
Electrical time constant		0.21 ms
Rotor inertia		2.75 ·10⁻⁹ kgm²
Step angle (full step)		18 °
Angular accuracy		10 %
Angular acceleration, max.		363 ·10³ rad/s²
Resonance frequency (at no load)		75 Hz
Thermal resistance		4.1 / 65.3 K/W
Thermal time constant		3.5 / 160 s
Operating temperature range		-30 ... 70 °C
Winding temperature, max.		130 °C
Housing material		aluminium, black anodized
Mass		3.3 g
Magnet material		NdFeB

Values at 22° and nominal voltage		Value
Nominal current per phase (both phases ON)		0.08 A
Boosted current per phase (both phases ON)		0.16 A
Phase resistance		56 Ω
Phase inductance (1 kHz)		12.6 mH
Holding torque (at nominal current in both phases)		0.65 mNm
Holding torque at boosted current		1 mNm
Residual torque, typ.		0.13 mNm
Back-EMF amplitude		2.4 V/k step/s
Electrical time constant		0.21 ms
Rotor inertia		2.75 ·10⁻⁹ kgm²
Step angle (full step)		18 °
Angular accuracy		10 %
Angular acceleration, max.		363 ·10³ rad/s²
Resonance frequency (at no load)		75 Hz
Thermal resistance		4.1 / 65.3 K/W
Thermal time constant		3.5 / 160 s
Operating temperature range		-30 ... 70 °C
Winding temperature, max.		130 °C
Housing material		aluminium, black anodized
Mass		3.3 g
Magnet material		NdFeB

Values at 22° and nominal voltage		Value
Nominal current per phase (both phases ON)		0.15 A
Boosted current per phase (both phases ON)		0.3 A
Phase resistance		18 Ω
Phase inductance (1 kHz)		3.9 mH
Holding torque (at nominal current in both phases)		0.65 mNm
Holding torque at boosted current		1 mNm
Residual torque, typ.		0.13 mNm
Back-EMF amplitude		1.3 V/k step/s
Electrical time constant		0.21 ms
Rotor inertia		2.75 ·10⁻⁹ kgm²
Step angle (full step)		18 °
Angular accuracy		10 %
Angular acceleration, max.		363 ·10³ rad/s²
Resonance frequency (at no load)		75 Hz
Thermal resistance		4.1 / 65.3 K/W
Thermal time constant		3.5 / 160 s
Operating temperature range		-30 ... 70 °C
Winding temperature, max.		130 °C
Housing material		aluminium, black anodized
Mass		3.3 g
Magnet material		NdFeB

Values at 22° and nominal voltage		Value
Nominal current per phase (both phases ON)		0.225 A
Boosted current per phase (both phases ON)		0.45 A
Phase resistance		7.3 Ω
Phase inductance (1 kHz)		1.4 mH
Holding torque (at nominal current in both phases)		0.65 mNm
Holding torque at boosted current		1 mNm
Residual torque, typ.		0.13 mNm
Back-EMF amplitude		0.8 V/k step/s
Electrical time constant		0.21 ms
Rotor inertia		2.75 ·10⁻⁹ kgm²
Step angle (full step)		18 °
Angular accuracy		10 %
Angular acceleration, max.		363 ·10³ rad/s²
Resonance frequency (at no load)		75 Hz
Thermal resistance		4.1 / 65.3 K/W
Thermal time constant		3.5 / 160 s
Operating temperature range		-30 ... 70 °C
Winding temperature, max.		130 °C
Housing material		aluminium, black anodized
Mass		3.3 g
Magnet material		NdFeB

Values at 22° and nominal voltage		Value
Nominal current per phase (both phases ON)		0.15 A
Boosted current per phase (both phases ON)		0.3 A
Phase resistance		18 Ω
Phase inductance (1 kHz)		3.9 mH
Holding torque (at nominal current in both phases)		0.65 mNm
Holding torque at boosted current		1 mNm
Residual torque, typ.		0.13 mNm
Back-EMF amplitude		1.3 V/k step/s
Electrical time constant		0.21 ms
Rotor inertia		2.75 ·10⁻⁹ kgm²
Step angle (full step)		18 °
Angular accuracy		10 %
Angular acceleration, max.		363 ·10³ rad/s²
Resonance frequency (at no load)		75 Hz
Thermal resistance		4.1 / 65.3 K/W
Thermal time constant		3.5 / 160 s
Operating temperature range		-30 ... 70 °C
Winding temperature, max.		130 °C
Housing material		aluminium, black anodized
Mass		3.3 g
Magnet material		NdFeB

Values at 22° and nominal voltage		Value
Nominal current per phase (both phases ON)		0.08 A
Boosted current per phase (both phases ON)		0.16 A
Phase resistance		56 Ω
Phase inductance (1 kHz)		12.6 mH
Holding torque (at nominal current in both phases)		0.65 mNm
Holding torque at boosted current		1 mNm
Residual torque, typ.		0.13 mNm
Back-EMF amplitude		2.4 V/k step/s
Electrical time constant		0.21 ms
Rotor inertia		2.75 ·10⁻⁹ kgm²
Step angle (full step)		18 °
Angular accuracy		10 %
Angular acceleration, max.		363 ·10³ rad/s²
Resonance frequency (at no load)		75 Hz
Thermal resistance		4.1 / 65.3 K/W
Thermal time constant		3.5 / 160 s
Operating temperature range		-30 ... 70 °C
Winding temperature, max.		130 °C
Housing material		aluminium, black anodized
Mass		3.3 g
Magnet material		NdFeB

Recommended operation areas

Relevant for 2 phases ON only. On PWM drivers or chopper (current mode), the current is set to the nominal value and the supply voltage is typically 2.5 to 5x higher than the nominal voltage.

Curves measured with a load inertia of 6·10^-9 kgm², in half-step mode for the “1 x nominal voltage” curve, in 1/4 microstepping mode for the other curves.

Recommended operation areas

Relevant for 2 phases ON only. On PWM drivers or chopper (current mode), the current is set to the nominal value and the supply voltage is typically 2.5 to 5x higher than the nominal voltage.

Curves measured with a load inertia of 6·10^-9 kgm², in half-step mode for the “1 x nominal voltage” curve, in 1/4 microstepping mode for the other curves.

Recommended operation areas

Relevant for 2 phases ON only. On PWM drivers or chopper (current mode), the current is set to the nominal value and the supply voltage is typically 2.5 to 5x higher than the nominal voltage.

Curves measured with a load inertia of 6·10^-9 kgm², in half-step mode for the “1 x nominal voltage” curve, in 1/4 microstepping mode for the other curves.

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3D-CAD Files

Application note

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AN 001 - Stepper motor basics

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AN 002 - Reading and understanding a torque curve

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AN 011 - Final quality control data

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Your Choice

Selected Variant

Series AM0820SB022501

Two phase, 20 steps per revolution

Key Features

Holding torque at boosted current: 1 mNm

Step angle (full step): 18 °

Diameter: 8 mm

Length: 13.8 mm

Selected Variant

Series AM0820SB015001

Two phase, 20 steps per revolution

Key Features

Holding torque at boosted current: 1 mNm

Step angle (full step): 18 °

Diameter: 8 mm

Length: 13.8 mm

Selected Variant

Series AM0820SB008001

Two phase, 20 steps per revolution

Key Features

Holding torque at boosted current: 1 mNm

Step angle (full step): 18 °

Diameter: 8 mm

Length: 13.8 mm