Brushless DC-Servomotors Series 2057 ... B

2 Pole Technology

Key Features

Nominal voltage:

12 ... 24 V

Rated torque up to:

16.2 mNm

No-load speed up to:

24900 min⁻¹

Stall torque up to:

172 mNm

Diameter:

20 mm

Length:

57 mm

Advantages

High density ironless system FAULHABER winding

Digital or analog hall sensors available

Extremely smooth speed control

Sensitive positioning control

Variants:

Values at 22° and nominal voltage		Value
Nominal voltage	U_N	12 V
Terminal resistance, phase-phase	R	0.523 Ω
Efficiency, max.	η_max.	83 %
No-load speed	n₀	21000 min⁻¹
No-load current	I₀	0.187 A
Stall torque	M_H	127 mNm
Friction torque, static	C₀	0.15 mNm
Friction torque, dynamic	C_V	4.13 ·10⁻⁵ mNm/min⁻¹
Speed constant	k_n	1720 min⁻¹/V
Back-EMF constant	k_E	0.582 mV/min⁻¹
Torque constant	k_M	5.55 mNm/A
Current constant	k_I	0.18 A/mNm
Slope of n-M curve	Δn/ΔM	162 min⁻¹/mNm
Terminal inductance, phase-phase	L	38.5 µH
Mechanical time constant	τ_m	6.78 ms
Rotor inertia	J	4 gcm²
Angular acceleration	α_max.	318 ·10³rad/s²
Thermal resistance	R_th1/R_th2	2.5 / 12 K/W
Thermal time constant	τ_w1/τ_w2	7.3 / 720 s
Operating temperature range		-30 ... 125 °C
Winding temperature, max.		125 °C
Housing material		aluminium, black anodized
Mass		95 g
Direction of rotation		electronically reversible
Speed up to	n_max.	55000 min⁻¹
Number of pole pairs		1
Hall sensors		digital
Magnet material		NdFeB

Values at 22° and nominal voltage		Value
Nominal voltage	U_N	12 V
Terminal resistance, phase-phase	R	0.523 Ω
Efficiency, max.	η_max.	83 %
No-load speed	n₀	21000 min⁻¹
No-load current	I₀	0.187 A
Stall torque	M_H	127 mNm
Friction torque, static	C₀	0.15 mNm
Friction torque, dynamic	C_V	4.13 ·10⁻⁵ mNm/min⁻¹
Speed constant	k_n	1720 min⁻¹/V
Back-EMF constant	k_E	0.582 mV/min⁻¹
Torque constant	k_M	5.55 mNm/A
Current constant	k_I	0.18 A/mNm
Slope of n-M curve	Δn/ΔM	162 min⁻¹/mNm
Terminal inductance, phase-phase	L	38.5 µH
Mechanical time constant	τ_m	6.78 ms
Rotor inertia	J	4 gcm²
Angular acceleration	α_max.	318 ·10³rad/s²
Thermal resistance	R_th1/R_th2	2.5 / 12 K/W
Thermal time constant	τ_w1/τ_w2	7.3 / 720 s
Operating temperature range		-30 ... 125 °C
Winding temperature, max.		125 °C
Housing material		aluminium, black anodized
Mass		95 g
Direction of rotation		electronically reversible
Speed up to	n_max.	55000 min⁻¹
Number of pole pairs		1
Hall sensors		digital
Magnet material		NdFeB

Values at 22° and nominal voltage		Value
Nominal voltage	U_N	24 V
Terminal resistance, phase-phase	R	1.32 Ω
Efficiency, max.	η_max.	84 %
No-load speed	n₀	24900 min⁻¹
No-load current	I₀	0.129 A
Stall torque	M_H	172 mNm
Friction torque, static	C₀	0.15 mNm
Friction torque, dynamic	C_V	4.13 ·10⁻⁵ mNm/min⁻¹
Speed constant	k_n	1010 min⁻¹/V
Back-EMF constant	k_E	0.991 mV/min⁻¹
Torque constant	k_M	9.46 mNm/A
Current constant	k_I	0.106 A/mNm
Slope of n-M curve	Δn/ΔM	141 min⁻¹/mNm
Terminal inductance, phase-phase	L	114 µH
Mechanical time constant	τ_m	5.9 ms
Rotor inertia	J	4 gcm²
Angular acceleration	α_max.	430 ·10³rad/s²
Thermal resistance	R_th1/R_th2	2.5 / 12 K/W
Thermal time constant	τ_w1/τ_w2	7.3 / 720 s
Operating temperature range		-30 ... 125 °C
Winding temperature, max.		125 °C
Housing material		aluminium, black anodized
Mass		95 g
Direction of rotation		electronically reversible
Speed up to	n_max.	55000 min⁻¹
Number of pole pairs		1
Hall sensors		digital
Magnet material		NdFeB

Values at 22° and nominal voltage		Value
Nominal voltage	U_N	24 V
Terminal resistance, phase-phase	R	1.32 Ω
Efficiency, max.	η_max.	84 %
No-load speed	n₀	24900 min⁻¹
No-load current	I₀	0.129 A
Stall torque	M_H	172 mNm
Friction torque, static	C₀	0.15 mNm
Friction torque, dynamic	C_V	4.13 ·10⁻⁵ mNm/min⁻¹
Speed constant	k_n	1010 min⁻¹/V
Back-EMF constant	k_E	0.991 mV/min⁻¹
Torque constant	k_M	9.46 mNm/A
Current constant	k_I	0.106 A/mNm
Slope of n-M curve	Δn/ΔM	141 min⁻¹/mNm
Terminal inductance, phase-phase	L	114 µH
Mechanical time constant	τ_m	5.9 ms
Rotor inertia	J	4 gcm²
Angular acceleration	α_max.	430 ·10³rad/s²
Thermal resistance	R_th1/R_th2	2.5 / 12 K/W
Thermal time constant	τ_w1/τ_w2	7.3 / 720 s
Operating temperature range		-30 ... 125 °C
Winding temperature, max.		125 °C
Housing material		aluminium, black anodized
Mass		95 g
Direction of rotation		electronically reversible
Speed up to	n_max.	55000 min⁻¹
Number of pole pairs		1
Hall sensors		digital
Magnet material		NdFeB

Operating Area

Recommended operation areas at nominal voltage 12 V

The diagram indicates the recommended speed in relation to the available torque at the output shaft for a given ambient temperature of 22°C.

The diagram shows the motor in a completely insulated as well as thermally coupled condition (R_th2 50% reduced).

The nominal voltage (U_N) curve shows the operating point at nominal voltage in the insulated and thermally coupled condition. Any points of operation above the curve at nominal voltage will require a higher operating voltage. Any points below the nominal voltage curve will require less voltage.

Characteristic curves of motor