Can a 10hp Motor Run in Your Homemade Electric Car

Yes, electric motors are rated as the power they can provide all day every day, 24/7 without overheating. Automotive engines are rated as the maximum power they can produce, usually for only a short time before overheating. Therefore taking that the stall current is the maximum current an electric motor will draw, and stall current on a normal three-phase supply is about six times the running current, the 10HP motor will produce 60HP from a cold start. Electronic technology can actually improve this to over 100HP, real HP to the wheels. That is enough for most typical size modern cars.

1. Can a homemade jet engine thrust a toy car? It is made from a DC motor.

Just from the little detail you've given, I would say you built a ducted fan type of motor. They can be quite powerful if designed properly. Ducted Fans are frequently used in RC model aircraft so as to avoid a propeller - nothing is sorrier than to see a well built model jet with a propeller on it!.

2. I want to understand how robots are programmed.?

The same way your washing machine does. Set it too a cycle and it will complete that cycle, based on the variables put into the program. Open water inflow = 27 seconds, switch on motor = 9 minutes. Etc.. The next cycle will only change the time limits, it still opens, "Open water inflow" Peace. P.S. Because programmers are nasty the last instruction could be: Wi=27 and Som=540.

3. Everything You Need to Know About SCRs

A diode is an electrical component that allows electricity to flow in one direction, but not in the other. It's similar to a check valve that lets water flow out, but not back in. It's also like a flap on an exhaust vent. If air is flowing in the right direction, the force of the air opens the vent and allows the fumes to escape. Once the air stops blowing, gravity closes the flap to prevent the outside air, debris, fumes, or animals from getting back in. In the illustration below, when the incoming AC wave is positive current is flowing from left to right so the diode allows the current to flow through. When the AC wave is negative, current wants to flow from right to left, so the diode blocks it. A diode only allows current to flow in one direction If only one diode is used (as shown above) with an AC input, the output is known as half-wave AC because only the positive half of the AC line comes through. So how do we take advantage of the AC line when it's in the negative portion of its phase? With a diode bridge. If you take 4 diodes and arrange them in a diamond pattern as show in the illustration below, the output of the diode bridge is always positive regardless of the AC input being positive or negative. This output is known as rectified AC. Illustration of a Diode Bridge to convert AC into Rectified AC In the United States, the 115V and 230V AC line power sources are at 60 Hz. This means there are 60 complete waves in 1 second. For a rectified AC output then, there are 120 pulses per second. This is so fast that the DC motor acts as thought it's being powered by DC. So now we know how we get rectified AC voltage and that it can make a DC motor spin, but how can we vary the speed of a DC motor? By varying the voltage across the motor using Silicon-controlled Rectifiers (SCRs). A SCR is like a diode, but with the added ability to be able to turn it on and off, so that the electricity not only flows in one direction, but only flows in that direction when you want there to be a flow. By replacing two of the diodes with SCRs, we convert out diode bridge into a rectifier bridge and we can control the average amount of voltage across the DC motor. Using SCRs in place of the two incoming diodes converts a Diode Bridge into a Rectifier Bridge One noticable difference between the outputs of the diode bridge and the rectifier bridge is that the SCR output has a delay at the start of each pulse. This is built by design into SCR motor controls to prevent the two SCRs from turning on at the same time. If both SCRs were to be on, it would create a short circuit across the AC line, which would blow breakers and/or fuses, as well as possibly damage the SCRs. This is why with a 115 VAC line source, the most amount of voltage you will be able to get out of a SCR control is 100 VDC, which is why DC brushed motors are typically rated for 90 VDC. With a 230 VAC line source, typical DC brushed motors are rated for 180 VDC. By adding a delay before turning on the SCR, we can not limit the amount of voltage allowed out across the motor. This delay is called the phase-angle. The higher the phase angle, the sooner the SCR will turn on and the longer the rectified output will be allowed across the motor. The illustration below shows a rectifier bridge with a small phase angle applied to the SCRs to run the DC motor at a lower speed. SCRs motor controls for brushed DC motors typically have a 1.37 form factor with a 60:1 speed range for a 1% load regulation. This means you can expect to turn a typical 90V DC motor down to 1.5 VDC and maintain a 1% variation (0.9 VDC in this example). Typically the lowest speed possible in any SCR and DC motor combination is determined by the motor. DC motors typically begin cogging before the drive's output becomes an issue. Illustration of SCRs being used to limit the amount of voltage out across a DC motor Click here to learn about the benefits and drawbacks of SCR DC motor controls. Click here to see American Control Electronics offering of non-regenerative SCR controls or here to see regenerative SCR offerings. Click here to learn about the alternative to SCRs for DC motor control, PWMs.

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