Coupling element having vibration damping
A coupling for connection of an encoder to an electrical machine includes an encoder shaft end piece for coupling to a shaft of the encoder, and a machine shaft end piece for coupling to a shaft of the electrical machine. At least one of the end pieces has a carrier which is formed with a cavity filled with granular material, preferably steel powder, to effect a dampening of vibrations and impacts.
1. A coupling for connecting an encoder to an electrical machine, said coupling comprising:
an encoder shaft end piece configured for coupling to a shaft of the encoder;
a machine shaft end piece configured for coupling to a shaft of the electric machine; wherein at least one member selected from the group consisting of the encoder shaft end piece and the machine shaft end piece includes a carrier formed in one piece with the member, said carrier extending from the member and having a fully enclosed cavity;
a granular material filled in the cavity; and
a torque transmission element mounted between the encoder shaft end piece and the machine shaft end piece, wherein the carrier is coupled to a slot of the torque transmission element.
2. The coupling of claim 1 , wherein the torque transmission element is made of plastic.
3. The coupling of claim 1 , constructed for damping vibrations or impacts.
4. The coupling of claim 1 , constructed for damping excess vibration stress at a resonance frequency caused by an oscillating system comprised of the coupling and a mass inertia of the encoder connected to the coupling.
5. The coupling of claim 1 , wherein the shaft end piece has exactly two carriers.
6. The coupling of claim 1 , wherein the carrier has exactly one cavity filled with the granular material.
7. The coupling of claim 1 , wherein the end pieces are formed from steel.
8. The coupling of claim 1 , wherein the granular material completely fills the cavity.
9. The coupling of claim 1 , wherein the granular material is steel powder.