Laserlassie
Mechanical
Hi!
I am currently designing and simulating an electric outrunner motor (rotor on the outside). I need to evaluate the displacement of the external rotor at approximately 15000 rpm and in the software i am using (siemens nx) i apply this as a rotational load. I am fairly certain that the solver only uses this rotational speed to calculate the centrifugal forces. However, I am a bit uncertain about the constraints i have applied. In the motor mentioned, the shaft is connected to the external rotor by a slot connection and runs trough the internal stator (see figure). The shaft is supported by two bearings. I have currently modeled these bearings as infinite stiff using pinned connections (free rx,ry,rz and fixed x,y,z). However, the shaft also needs to be fixed at one location to stop rigid body rotation. I have therefore used an RBE2 (rigid connector) that is connected to face of the shaft and fixed. So my question is, does this seem like a OK way of restraining the model? Something tells me it's not.. (PS: The brown arrows in the figure are contact sets, and the spider at the shaft is the RBE2 which is fixed, the red arrows is an applied torque of 160Nm.)
Thanks for the replies!
I am currently designing and simulating an electric outrunner motor (rotor on the outside). I need to evaluate the displacement of the external rotor at approximately 15000 rpm and in the software i am using (siemens nx) i apply this as a rotational load. I am fairly certain that the solver only uses this rotational speed to calculate the centrifugal forces. However, I am a bit uncertain about the constraints i have applied. In the motor mentioned, the shaft is connected to the external rotor by a slot connection and runs trough the internal stator (see figure). The shaft is supported by two bearings. I have currently modeled these bearings as infinite stiff using pinned connections (free rx,ry,rz and fixed x,y,z). However, the shaft also needs to be fixed at one location to stop rigid body rotation. I have therefore used an RBE2 (rigid connector) that is connected to face of the shaft and fixed. So my question is, does this seem like a OK way of restraining the model? Something tells me it's not.. (PS: The brown arrows in the figure are contact sets, and the spider at the shaft is the RBE2 which is fixed, the red arrows is an applied torque of 160Nm.)
Thanks for the replies!
