Electrical motors and methods thereof having reduced electromagnetic emissions

Abstract

Motors and method of operation thereof operable in a running mode wherein the motor operates at a constant speed, and operable in a park mode wherein the motor is dynamically parked. The motor is housed within a housing and includes a rotating park disk configured to cause the motor to dynamically park. A park wire electrically couples the park disk to a switch configured to selectively set the motor to the running mode or the park mode, and a power wire electrically couples the park disk to a power source. Portions of the wires exit the housing so as to be disposed externally of the housing. The park wire is electrically isolated from the power wire during operation of the motor in the running mode and the park wire is electrically connected to the power wire during operation of the motor in the park mode.

1 . An electrical motor operable in at least one running mode wherein the electrical motor operates at a constant speed and operable in a park mode wherein the electrical motor dynamically parks, the electrical motor comprising:
 a housing;   a rotating park disk within the housing and configured to cause the electrical motor to dynamically park;   a park wire electrically coupling the park disk to a motor switch, the motor switch configured to selectively switch the electrical motor between the at least one running mode and the park mode, the park wire exiting the housing and being exposed at an exterior of the housing; and   a power wire electrically coupling the park disk to a power source, the power wire exiting the housing and being exposed at the exterior of the housing;   wherein the park disk is electrically isolated from the power wire during operation of the electrical motor in the at least one running mode and the park wire is electrically connected to the power wire through the park disk during operation of the electrical motor in the park mode.   
     
     
         2 . The electrical motor of  claim 1 , wherein the park disk is electrically isolated from the power wire during operation of the electrical motor in the at least one running mode with a relay that is normally open. 
     
     
         3 . The electrical motor of  claim 2 , wherein the relay is an electromechanical relay. 
     
     
         4 . The electrical motor of  claim 2 , wherein the relay is a solid-state relay. 
     
     
         5 . The electrical motor of  claim 1 , further comprising at least one running mode wire electrically coupling the electrical motor to a motor switch, the at least one running mode wire traveling from the electrical motor to the motor switch through a ferrite bead and through at least one inductor. 
     
     
         6 . The electrical motor of  claim 1 , further comprising at least one running mode wire electrically coupling the electrical motor to a motor switch, the at least one running mode wire being electrically coupled to the power wire with at least one filter capacitor. 
     
     
         7 . The electrical motor of  claim 1 , further comprising at least one running mode wire electrically coupling the electrical motor to a motor switch and a Faraday cage through which the at least one running mode wire travels after exiting the exterior of the housing. 
     
     
         8 . The electrical motor of  claim 7 , further comprising at least one filter capacitor within the Faraday cage, the at least one running mode wire running through the at least one filter capacitor. 
     
     
         9 . The electrical motor of  claim 8 , further comprising an EMI filter PC board having EMI filter caps thereon through which the at least one running mode wire travels after exiting the Faraday cage. 
     
     
         10 . The electrical motor of  claim 1 , further comprising a ground wire electrically coupling the park disk to ground, the ground wire exiting the housing and being exposed at the exterior of the housing, the park wire and the power wire being electrically coupled to the ground wire with RC filters. 
     
     
         11 . An electrical motor operable in at least one running mode wherein the electrical motor operates at a constant speed and operable in a park mode wherein the electrical motor dynamically parks, the electrical motor comprising:
 a housing;   a rotating park disk within the housing and functionally coupled to a ground contact, a park contact, and a battery positive contact, the park disk configured to allow the electrical motor to dynamically park by operating the electrical motor in the at least one running mode until the park disk rotates to a park position such that the park disk is electrically coupled to the ground contact and the park contact and not electrically coupled to the battery positive contact;   a park wire electrically coupling the park contact to a motor switch, the motor switch configured to selectively switch the electrical motor between the at least one running mode and the park mode, the park wire exiting the housing and being exposed at an exterior of the housing; and   a battery positive wire electrically coupling the battery positive contact to a positive terminal on a battery, the battery positive wire exiting the housing and being exposed at the exterior of the housing,   wherein the park disk is electrically isolated from the battery positive wire during operation of the electrical motor in the at least one running mode and the park wire is electrically connected to the battery positive wire through the park disk during operation of the electrical motor in the park mode.   
     
     
         12 . A method of operating an electrical motor operable in at least one running mode wherein the electrical motor operates at a constant speed and operable in a park mode wherein the electrical motor dynamically parks, the electrical motor comprising a housing with a rotating park disk therein configured to cause the electrical motor to dynamically park, a park wire electrically coupling the park disk to a motor switch, the motor switch configured to selectively switch the electrical motor between the at least one running mode and the park mode, the park wire exiting the housing and being exposed at an exterior of the housing, a power wire electrically coupling the park disk to a power source, the power wire exiting the housing and being exposed at the exterior of a housing, the method comprising:
 electrically isolating the park disk from the power wire during operation of the electrical motor in the at least one running mode; and   electrically connecting the park wire through the park disk to the power wire during operation of the electrical motor in the park mode.   
     
     
         13 . The method of  claim 12 , wherein electrically isolating the park disk wire from the power wire includes providing a relay that is normally open between the park disk and the power wire. 
     
     
         14 . The method of  claim 13 , wherein the relay is an electromechanical relay. 
     
     
         15 . The method of  claim 14 , wherein electrically connecting the park wire to the power wire includes energizing the electromechanical relay. 
     
     
         16 . The method of  claim 13 , wherein the relay is a solid-state relay. 
     
     
         17 . The method of  claim 12 , further comprising providing a ferrite bead and at least one inductor on at least one running mode wire between the electrical motor and the motor switch, the at least one running mode wire electrically coupling the electrical motor to the motor switch. 
     
     
         18 . The electrical motor of  claim 12 , further comprising electrically coupling at least one running mode wire to the power wire with at least one filter capacitor, the at least one running mode wire electrically coupling the electrical motor to the motor switch. 
     
     
         19 . The electrical motor of  claim 12 , further comprising electrically coupling the park wire and the power wire to a ground wire with RC filters, the ground wire electrically coupling the park disk to ground and exiting the housing and being exposed to the exterior of the housing. 
     
     
         20 . The electrical motor of  claim 12 , further comprising providing a Faraday cage through which at least one running mode wire travels after exiting the exterior of the housing, the at least one running mode wire electrically coupling the electrical motor to the motor switch. 
     
     
         21 . The electrical motor of  claim 20 , further comprising providing at least one filter capacitor within the Faraday cage with the at least one running mode wire running through the at least one filter capacitor and providing an EMI filter PC board having EMI filter caps thereon through which the at least one running mode wire travels after exiting the Faraday cage. 
     
     
         22 . The electrical motor of  claim 12 .