Apparatus and a method for determining the viscosity of a fluid
AssigneeLevitronix LLC
InventorsReto Schöb, Simon Huwyler
Life of this patent
Estimating the term…
Abstract
An apparatus and a method for determining the viscosity of a fluid includes an electrical rotary drive (2) with a stator (3), which has a stator winding (4), and with a rotational body (5) which can rotate in the fluid (1). The rotational body (5) is designed as a rotor (5) of the rotary drive (2) and is magnetically journalled in a contact-free manner with respect to the stator (3).
Claims27
A method for determining the viscosity of a fluid comprising providing a rotatable body and an electric drive for rotating the body;
- magnetically rotatably supporting the body in a contact-free manner;
- immersing the body in the fluid;
- independently directing electric power to the electric drive for rotating the body and for magnetically supporting the body, respectively;
- measuring the electric power consumed by the electric drive for rotating the body;
- and determining the viscosity of the fluid from the electric power consumed by the electric drive for rotating the body.
Apparatus for determining the viscosity of a fluid comprising a rotatable body for rotation when immersed in the fluid;
- an electric drive including a stator winding for rotating the body and magnetically rotatably journalling the body in a contact-free manner;
- a source of electric power for the electric drive for rotating the body;
- and a processor for determining the viscosity of the fluid from the electric power consumed by the electric drive for rotating the body when the body is immersed and rotates in the fluid.
A method for determining the viscosity of a fluid comprising providing a rotatable body and an electric drive including a stator winding for rotating the body;
- magnetically rotatably supporting the body in a contact-free manner with respect to the stator winding;
- immersing the body in the fluid;
- independently directing electric power to the electric drive for rotating the body and for magnetically supporting the body, respectively;
- measuring the electric power consumed by the electric drive for rotating the body;
- with the body inducing at least a portion of the fluid to flow;
- determining the viscosity of the fluid from the electric power consumed by the electric drive for rotating the body;
- and maintaining an operating range for the electric drive so that the electric power needed by the body for overcoming a viscous resistance of the fluid amounts to at least about 80% of the total electric power consumed by the electric drive.
Apparatus for determining the viscosity of a fluid comprising a rotatable body for rotation when immersed in the fluid and causing at least a portion of the fluid to flow;
- an electric drive including a stator winding for rotating the body and magnetically rotatably journalling the body in a contact-free manner relative to the stator winding;
- a source of electric power for the electric drive for rotating the body;
- the electric drive and the body being configured so that electric power needed by the body to overcome viscous resistance of the fluid amounts to at least about 80% of the total power consumed by the electric drive;
- and a processor for determining the viscosity of the fluid from the electric power consumed by the electric drive for rotating the body when the body is immersed and rotates in the fluid.
Dependencies are inferred from the claim text.