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An enternal nutrition pump system operates in a cyclical manner with a period between cycles being selected in accordance with the desired fluid delivery rate. Each pump cycle may correspond to a single rotation of the rotor or a fractional rotation of the rotor. Rotor rotation may alternatively be

An enternal nutrition pump system operates in a cyclical manner with a period between cycles being selected in accordance with the desired fluid delivery rate. Each pump cycle may correspond to a single rotation of the rotor or a fractional rotation of the rotor. Rotor rotation may alternatively be sensed by utilization of magnetic sensors or by monitoring of the AC componment of current supplied to a DC motor driving the rotor.

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A motor unit for a medical fluid delivery system for use with a disposable delivery set for pumping medical fluid, comprising: pump operating means, including a motor, for acting in cooperation with said delivery set to deliver a volume of said fluid during each operating cycle; pump control means f

A motor unit for a medical fluid delivery system for use with a disposable delivery set for pumping medical fluid, comprising: pump operating means, including a motor, for acting in cooperation with said delivery set to deliver a volume of said fluid during each operating cycle; pump control means for controlling said pump operating means to deliver said fluid at a desired volumetric rate, said pump control means including means responsive to signals indicating said desired rate for activating said pump operating means for one of said operating cycles and for repeating said activation at variable time intervals selected in accordance with said desired volumetric rate; wherein said pump control means includes means for sensing a condition of said pump operating means with respect to said operating cycle; and wherein said pump operating means comprises a DC motor and wherein said means for sensing the condition of said pump operating means comprises means for sensing the AC component of the current supplied to said DC motor. A motor unit for a medical fluid delivery system for use with a disposable delivery set having a flexible pump tube for engagement with said motor unit for pumping medical fluids, comprising: a housing for receiving at least portions of said delivery set; a motor mounted on said housing; a rotor mounted on said housing and driven by said motor for rotational movement with respect to said housing and for receiving said flexible pump tube for forming a peristaltic pump; at least one magnet and at least one magnetic field detector mounted to said rotor and said housing for relative rotational motion with respect to each other, said magnet and said magnetic field detector being operatively adjacent to each other at at least one rotational position of said rotor; and pump control means, responsive to selection of a fluid delivery rate and responsive to said magnetic field detector, for operating said motor until said rotor is in said rotational position with said magnet and said magnetic field detector adjacent each other and for repeating said operation at variable time intervals selected in accordance with said selected fluid delivery rate. In a fluid delivery system comprising a motor unit and a disposable delivery set, wherein said motor unit includes a motor driven rotor for engaging a flexible pump tube on said delivery set to form a peristaltic pump, a method for detecting the absence of the pump tube on said rotor, comprising: providing current to a DC motor to operate said rotor; detecting an AC component of the current provided to said DC motor; and comparing the detected AC component of said current to a reference level to detect current variation resulting from the presence of the pump tube on said rotor.