GR 42x40-24 VDC Electric Motor Datasheet

	Manufacturer typenumber	GR 42x40-24 VDC
	Manufacturer brand	Dunkermotoren
	Commutation	brush
	Short description of the motor	brushed motor
Performance data
	Maximum rated output power motoraxis	P_rated [W]	20.000
	Nominal terminal voltage	U_nom [V]	24.000
	Motorconstant at standard temp. 22 ^oC	k [^Vs/_rad or ^Nm/_A]	5.810e-2
	Maximum torque at standstill at nominal voltage	T_stall [Nm]	0.332
	Maximum theoretical velocity motoraxis at no load (and no friction of motor and reduction) and nominal voltage	ω₀ [^rad/_s]	413.088
	Maximum voltage allowed to prevent sparking due to brushed commutation	U_max [V]	24.000
	Maximum output power equal to ¹/₄T_stallω₀	P_max [W]	35.378
Mechanical data
	Inertia of rotor	J_rotor [kgm²]	1.100e-5
	Maximum acceleration at standstill if no load or reduction is attached	max. accel [^rad/_s2]	3.019e+4
	Constant friction torque of motor on motoraxis	T_fric [Nm]	0.010
	Mechanical timeconstant	τ_mech [s]	1.326e-2
Electrical data
	Resistance windings at standard temp. 22 ^oC	R [Ω]	4.070
	Slope of the motor	S [^Nms/_rad]	8.293e-4
Thermal data
	Maximum allowed temperature of windings	Θ_max [^oC]	120.000
	Maximum continuous current (thermal limit) at surround temp. 22 ^oC and at stillstand	I_{max, thermal} [A]	1.191
	Thermal resistance between rotor and ambient	R_th,total [^K/_W]	12.248
Magnet data
	the material of the magnet	magnetmaterial	unknown
	degrading of the magnetic flux density in percent per ^oC or K	TK_Br [%/K]	-2.000e-1

Remarks:

The frictiontorque is determined via two ways and they do not match; it is determined from the no load current and the maximum efficiency. The friction from given maximum efficiency is lower than determined from no load currrent. Used here is the no load current divided by the torque constant to be safe, so pratical values may be more favourable.
The vendor has not provided magnetmaterial. The derating for the magnetstrength is not given so 'worst case' is used of -0.2%/K. The thermal resistance R_th,total is determined from given stallcurrent and derived winding resistance R. This means that the calculated temperature may be inaccurate.
The winding resistance R is determined from the steepness of the motor so the value may not be accurate. This means that the calculated current and voltage may be inaccurate.
C_th,total is not provided. This means that the time when thermal stability occurs can not be calculated.
The vendor has not provided information about a heatsink for the given thermal information.

The quality and completeness of the supplied information has quality index: E

This quality index is determined by specAmotor.com. Here is described what the quality index is.