Multifunction PMDC motor apparatus and method thereof

摘要

A control circuit for a PMDC motor used in an ice delivery apparatus, the circuit including a double pole double throw relay that switches both sides of the circuit and peripheral circuitry connected between a power source and the double pole double throw relay to rectify the power source and power the PMDC motor.

主权项

1. A control circuit for a Permanent Magnet DC (PMDC) motor used in an ice delivery apparatus, the circuit comprising:
a double pole double throw (DPDT) relay having a pair of inputs, a first normally open (NO) contact, a second NO contact, a first normally closed (NC) contact, and a second NC contact, the first NC contact being electrically connected to a first input of the PMDC motor; a rectified AC power source having a first connection and a second connection, the first connection being connected to the pair of inputs of the DPDT relay; at least one capacitor that is electrically connected on a first side to the second NC contact and on a second side is electrically connected to the second connection of the rectified AC power source and a second input of the PMDC motor; a silicon controlled rectifier (SCR) having an anode electrically connected to the second NO contact, a gate electrically connected to the second NO contact through a resistor, and a cathode electrically connected to the first input of the PMDC motor; a resistor having one side electrically connected to the second NO contact and another side connected to the first input of the PMDC motor; and the double pole double throw relay being configured to operate the PMDC motor with the rectified AC power through the first NC contact for reversible rotation of an output shaft of the PMDC motor during crushed and shaved ice operation of the ice delivery apparatus and to operate the PMDC motor through the second NO contact, the SCR, and the resistor electrically connected to the second NO contact for non-reversing rotation of the output shaft during cubed ice operation of the ice delivery apparatus.