U9M4HA Electric Motor Datasheet

	Manufacturer typenumber	U9M4HA
	Manufacturer brand	Danaher
	Commutation	brush
	Short description of the motor	pancake motor-no equivalent Platinum model specified by vendor
Performance data
	Maximum rated output power motoraxis	P_rated [W]	138.000
	Nominal terminal voltage	U_nom [V]	34.700
	Maximum rated current	I_max [A]	56.000
	Maximum rated torque at standard temp.22 ^oC	T_max [Nm]	4.015
	Motorconstant at standard temp. 22 ^oC	k [^Vs/_rad or ^Nm/_A]	7.170e-2
	Maximum torque at standstill at nominal voltage	T_stall [Nm]	1.871
	Maximum theoretical velocity motoraxis at no load (and no friction of motor and reduction) and nominal voltage	ω₀ [^rad/_s]	483.961
	Maximum allowed velocity motoraxis	ω_max [^rad/_s]	628.319
	Maximum voltage allowed to prevent sparking due to brushed commutation	U_max [V]	34.700
	Maximum output power equal to ¹/₄T_stallω₀	P_max [W]	229.788
Mechanical data
	Inertia of rotor	J_rotor [kgm²]	2.000e-5
	Maximum acceleration at standstill if no load or reduction is attached	max. accel [^rad/_s2]	9.356e+4
	Constant friction torque of motor on motoraxis	T_fric [Nm]	0.028
	Velocity-dependant friction torque of motor on motoraxis	C_v [Nm/rad]	5.730e-5
	Mechanical timeconstant	τ_mech [s]	5.096e-3
Electrical data
	Resistance windings at standard temp. 22 ^oC	R [Ω]	1.310
	Winding inductance measured at terminals of motor	L [H]	1.000e-4
	Slope of the motor	S [^Nms/_rad]	3.924e-3
	Electrical timeconstant	τ_elec [s]	7.634e-5
Thermal data
	Maximum allowed temperature of windings	Θ_max [^oC]	150.000
	Maximum continuous current (thermal limit) at surround temp. 22 ^oC and at stillstand	I_{max, thermal} [A]	5.342
	Thermal resistance between rotor and ambient	R_th,total [^K/_W]	2.278
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-2

Remarks:

The vendor has not provided magnetmaterial. The vendor indicates that the thermal resistance at standstill (stall) is higher than the thermal current limit at nominal speed. The probable cause is an 'airpump' effect which makes thermal conditions MORE favorable at higher speeds. For useage in specAmotor a constant thermal resistance is derived (from the current I and allowed temperature) which is in between the two values.This means that the calculated temperature may be inaccurate.
C_th,total is not provided. This means that the time when thermal stability occurs can not be calculated.
The heatsink used for this motor is 8''x16''x3/8'' Alu

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

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

U9M4HA Electric Motor Datasheet

Performance data

Mechanical data

Electrical data

Thermal data

Magnet data

Remarks: