What causes a motor to start short of normal speed?
On air-handling equipment, the motor may start but will always fall short of normal operating speed. You may encounter excess noise, high amps, and high temperatures in combination with either of the first two symptoms. It’s relatively easy to diagnose common capacitor defects.
What should the voltage be to start a riding mower?
You can jump-start from any 12 volt vehicle. Check battery voltage using dvom – attach volt meter to the battery and set to 20 volts. If you have a reading above 12.5 volts – go ahead and attempt to start the mower, watch the voltage, a reading below 8 volts is a bad battery and needs to be replaced. Always disconnect the battery before charging.
What causes a 2 stroke engine to not start?
“Air” is usually never the problem. I have only once in my life experienced air being the problem with a 2 stroke engine not starting. It was an old snowmobile that had no air filter and it had sucked a piece of plastic sheeting material that came loose from under the hood into the carburetor.
How can you tell if a treadmill motor is good?
The best way to check if your motor is a good quality motor is by checking the manufacturer warranty. A high-quality motor will have a longer warranty period and is a safer investment.
Which is the best way to size a motor?
The number one calculation to make when sizing a motor for a rotary application is the calculation of the load inertia. The more ac- curately this can be calculated, the better. To make this calculation, it’s generally best to ap- proximate the load as a disc or cylinder.
Why do we need to size a direct drive motor?
This safety factor can account for the dynamic torque required to meet servo loop conditions. Size the motor within its continuous torque range, allowing it to use the intermittent torque to cover overshoot and settling, which we are calling the dynamic torque requirement.
How is the sizing of a motor related to heating?
Technical paper TN-9001 is closely related to this subject, and considers dynamic attributes of a servo system and how they relate to motor power and heating. The same fundamental sizing information works in both rotary and linear motors. For simplicity, we will stay in the rotary domain using the metric system of units.
What makes a motor not start under load?
So a motor with a faulty or open circuit switch will not start even under no load, just hums but will go if give shaft a spin (in either direction). however the pulleys, belts and drive shaft couplings you describe sound like much higher than this.