Grounding device for brushless electric motor
View Patent ↗A motor includes a rotor assembly includes a rotor and a motor shaft secured to the rotor. The motor further includes stator coils. Circuitry of the motor includes electronic components that cooperatively operate to activate and deactivate the coils to cause the rotor assembly to rotate, and first and second power terminals. An electrically conductive outer housing surrounds the motor. An electrically conductive grounding tab is electrically connected to the first power terminal. The tab contacts a radially-inwardly facing surface of the outer housing to provide a electrostatic discharge path from the outer housing to the ground terminal.
1. An apparatus comprising:
a motor including:
a rotor assembly including a rotor and a motor shaft secured to the rotor,
stator coils,
circuitry that includes electronic components that cooperatively operate to activate and deactivate the coils in a manner that causes the rotor assembly to rotate, and
first and second power terminals;
an electrically conductive outer housing that surrounds the motor; and
an electrically conductive grounding tab that is electrically connected to the first power terminal and that contacts an inwardly-facing surface of the outer housing to provide a electrostatic discharge path from the outer housing to the first power terminal, wherein the grounding tab includes a securing structure and a strip, wherein the securing structure receives the first power terminal, wherein the strip includes a proximal section that is coplanar with the securing structure and an upturned distal section that is substantially perpendicular to the proximal section, and wherein the upturned distal section of the strip pressingly contacts the inwardly-facing surface of the outer housing.
2. The apparatus of claim 1 , wherein the proximal section does not contact the outer housing.
3. The apparatus of claim 1 , wherein the distal section is upturned in a direction in which the housing is configured to slide when being slid over the motor to receive the motor.
4. The apparatus of claim 1 , wherein the proximal section and the distal section are substantially straight and meet at a localized bend in the strip.
5. The apparatus of claim 1 , wherein the grounding tab is not coupled to the outer housing by an adhesive or a fastener.
6. The apparatus of claim 1 , wherein the outer housing has a top opening and is configured for the motor to be slid into the outer housing through the top opening.
7. The apparatus of claim 1 , wherein the only resistance that the tab exerts against sliding of the motor into or out of the outer housing is frictional resistance between the tab and the outer housing.
8. The apparatus of claim 1 , further comprising a jumper strap that includes (i) a terminal-grasping section that grasps the first power terminal and (ii) a cable-grasping section that grasps an conductor of a power cable, wherein the jumper strap presses down on the tab and electrically couples the tab to the first power terminal.
9. The apparatus of claim 8 , wherein the tab is secured in place only by pressing contact from the jumper strap.
10. The apparatus of claim 1 , wherein the tab is secured in place by the tab grasping the first power terminal.
11. The apparatus of claim 1 , wherein the tab is not secured in place by an adhesive or fastener.
12. The apparatus of claim 1 , wherein the first terminal projects, from the motor, rigidly upward.
13. The apparatus of claim 1 , wherein the first power terminal is a ground terminal and the second power terminal is a supply terminal.
14. The apparatus of claim 1 , wherein the first power terminal is a negative terminal and the second power terminal is a positive terminal.
15. The apparatus of claim 1 , wherein the first power terminal is a positive terminal and the second power terminal is a negative terminal.
16. The apparatus of claim 1 , wherein the motor is a brushless motor, and the electronic components include a field effect transistor.
17. The apparatus of claim 1 , wherein the apparatus includes a fluid filter and a fluid pump, wherein the fluid pump is attached to the motor and is driven by the motor shaft.
18. The apparatus of claim 17 , wherein the fluid pump is a fuel pump and the filter is fuel filter.
19. An apparatus comprising:
a motor including:
a rotor assembly including a rotor and a motor shaft secured to the rotor,
stator coils,
circuitry that includes electronic components that cooperatively operate to activate and deactivate the coils in a manner that causes the rotor assembly to rotate, and
first and second power terminals;
an electrically conductive outer housing that surrounds the motor;
an electrically conductive grounding tab that is electrically connected to the first power terminal and that contacts an inwardly-facing surface of the outer housing to provide a electrostatic discharge path from the outer housing to the first power terminal; and
a jumper strap that includes (i) a terminal-grasping section that grasps the first power terminal and (ii) a cable-grasping section that grasps an conductor of a power cable, wherein the jumper strap presses down on the tab and electrically couples the tab to the first power terminal.
20. The apparatus of claim 19 , wherein the grounding tab includes a securing structure and a strip, wherein the securing structure receives the first power terminal, and wherein the strip pressingly contacts the inwardly-facing surface of the outer housing.
21. The apparatus of claim 19 , wherein the outer housing has a top opening and is configured for the motor to be slid into the outer housing through the top opening.
22. The apparatus of claim 19 , wherein the only resistance that the tab exerts against sliding of the motor into or out of the outer housing is frictional resistance between the tab and the outer housing.
23. The apparatus of claim 19 , wherein the tab is secured in place only by pressing contact from the jumper strap.