Uni-directional electric motors run just one way: clockwise (CW) or counterclockwise (CCW) but not both. Which way does an Electric Motor Run - Can Electric Motors run Backwards? Information found on the electric motor's data tag. In addition to the basic electric motor components above there are two other features to know about when troubleshooting a motor. In an A/C electric motor the run winding is what keeps the motor spinning once it has started.Ĭurrent flowing through this winding produces a rotating magnetic field in the stator that keeps the motor shaft turning after the start winding has turned off.Ī centrifugal switch connects the A/C electrical power to the motor to the start winding on the stator until the motor has reached a speed typically of 75-80% of its full run speed (typically that's1725 rpm or 3450 rpm on newer high-speed oil burners).Īlso see ELECTRIC MOTOR CENTRIFUGAL SWITCH or PTC PRD The start winding is disconnected, usually by a centrifugal switch, when the motor is up to speed. In an A/C (alternating current) electric motor electrical current flowing through the start winding is used just to get the motor spinning from a stopped condition. The two windings are used to create an electrical field in the stator. The stator consists is a device or core containing start and run windings (of copper wire) wound around a central core to create a magnetic field. The rotor follows (turns in the direction impelled by) the rotating magnetic field and thus spins the motor shaft The electric motor has quite a few parts if examined in detail, switches, wires, possibly capacitors, oiling ports and more, but there are four basic parts to every HVAC electric motor: Or skip right to ELECTRIC MOTOR WON'T START / RUN if you prefer. What Are the basic Components of an A/C Electric Motor such as used on heating and air conditioning equipment?īefore discussing how to diagnose air conditioner or heating system electric motors let's be sure we know what motor parts might be involved. Do not attempt these tasks unless you are properly trained and equipped. Sometimes the reset button on an electric motor is hard to find, and sometimes there is no reset button!įatal Shock Hazard Warning : Inspecting electrical components and systems risks death by electrocution as well as serious burns or other injuries to the inspector or to others. While our page top photo shows the red reset button most clearly, the reset button on the motor at left may be harder to spot. The page top photo was taken of of an oil burner electric motor not an air conditioning blower fan motor or pump motor, but you'll see that all of these electric motors look a lot alike.Īt left our photo illustrates the motor as typically found in a direct-drive HVAC blower or air handler assembly. In this article we explain why an electric motor might suddenly start running backwards, and we include instructions on how to reverse the direction of small electric motors by making simple wiring changes. Run Direction of an Electric Motor: diagnose & fix A/C Electric Motor Runs Backwards: Why? We also provide an ARTICLE INDEX for this topic, or you can try the page top or bottom SEARCH BOX as a quick way to find information you need. This article series describes A/C electrical motor troubleshooting: a troubleshooting guide that helps diagnose and repair most electric motor problems for motors found on HVAC equipment in buildings such as air conditioners, furnace or air handler blower fans, oil burner motors, well pumps, and condensate return pumps. Why would an electric motor suddenly start running backwards? Here we explain the causes and cures for a motor that is running backwards and we also discuss motors that are designed to reverse direction. We have no relationship with advertisers, products, or services discussed at this website.Įlectric motor run direction and backwards-running motors: InspectAPedia tolerates no conflicts of interest.
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