Motor and pump system

A motorized system comprising:

• A plurality of motor and pump assemblies, each having a fluid inlet and a fluid outlet, a controller electrically connected to said assemblies, a memory storing a plurality target back electromotive force values corresponding to said plurality of assemblies, a plurality of inputs connected to said controller
• wherein said controller is configured to control the flowrate of fluid traveling through the fluid outlets by sampling back electromotive forces of the plurality of motors, comparing the sampled back electromotive forces of the plurality of motors to one or more of the target back electromotive force values corresponding to the motors, and, based on the comparisons, adjust voltages provided to said motors to adjust the back electromotive forces of the assemblies such that average voltages provided to each of said motors over successive cycles of each of said motors each deviate from an initial run voltage provided to each of said motors such that the back electromotive forces of the assemblies remain convergent on the target back electromotive force over successive cycles;
• wherein the controller is configured to drive each motor intermittently such that each cycle is comprised of a portion of time where the controller applies voltage to the motor so as to drive the motor and a portion of time where the controller applies no voltage to the motor and the motor is stopped;
• and
• wherein the controller is configured to control the flow of fluid through the assemblies without utilizing an input from a sensor that senses the flowrate of fluid.

A fluid dispensing system comprising:

• a plurality of motor and pump assemblies, each having a fluid inlet and a fluid outlet, a controller electrically connected to said assemblies, a memory storing a plurality target back electromotive force values corresponding to said plurality of assemblies, a plurality of inputs connected to said controller, a plurality of fluid storage containers, a nozzle, and hoses connecting the fluid outlets to the nozzle and connecting the fluid storage containers to the fluid inlets
• wherein said controller is configured to simultaneously control the flowrate of fluid traveling through the fluid outlets of at least two assemblies by sampling back electromotive forces of at least two of the motors, comparing the sampled back electromotive forces of the motors to the target back electromotive force values corresponding to the motors, and independently adjusting voltages provided to the motors to adjust the back electromotive forces of the assemblies such that an average voltage provided to at least one of the two motors over successive cycles deviates from an initial run voltage applied to the at least one of the two motors such that the back electromotive force of one of the at least two assemblies remains convergent on a first one of the plurality of target back electromotive forces over successive cycles and the back electromotive force of at least one other of the at least two assemblies remains convergent on a second one of the plurality of target back electromotive forces over successive cycles, and
• wherein the controller is configured to drive the at least two motors intermittently such that each cycle is comprised of a portion of time where the controller applies voltage to the motors so as to drive the motors and a portion of time where the controller applies no voltage to the motors and the motors are stopped.