RPM = a/360 * fz * 60
RPM = Revolutions per minute. Example 1: Drive step resolution is set for 1000 steps per revolution.Working principle of a DC motor
An electric motor is an electrical machine which converts electrical energy into mechanical energy. The basic working principle of a DC motor is: "whenever a current carrying conductor is placed in a magnetic field, it experiences a mechanical force".Small DC motors are used in tools, toys, and appliances. The universal motor can operate on direct current but is a lightweight brushed motor used for portable power tools and appliances. Larger DC motors are currently used in propulsion of electric vehicles, elevator and hoists, and in drives for steel rolling mills.
Toys and tools are the most likely source. Good, easy, usually more powerful Small battery powered power tools usually use brush motors. Good usually Purely battery or battery/mains motorised appliances will usually have DC motors - eg electric toothbrush, razors, battery belnders, .
Operating Voltage.
Typical DC motors may operate on as few as 1.5 Volts or up to 100 Volts or more. Roboticists often use motors that operate on 6, 12, or 24 volts because most robots are battery powered, and batteries are typically available with these values.By turning on and off coils in sequence a rotating magnetic field can be created. These rotating magnetic fields interact with the magnetic fields of the magnets (permanent or electromagnets) in the stationary part of the motor (stator) to create a torque on the armature which causes it to rotate.
A.C. motors are powered from alternating current (A.C.) while D.C. motors are powered from direct current (D.C.), such as batteries, D.C. power supplies or an AC-to-DC power converter. A.C. induction motors do not use brushes; they are very rugged and have long life expectancies.
Brushless DC motors are similar to AC synchronous motors. The major difference is that synchronous motors develop a sinusoidal back EMF, as compared to a rectangular, or trapezoidal, back EMF for brushless DC motors. Both have stator created rotating magnetic fields producing torque in a magnetic rotor.
Look for the identification number on the engine block. The identification numbers on a Chevy engine with a small block V-8 are adjacent to the cylinder heads on the passenger's side, close to the front of the engine block. Look closely because the alternator blocks the identification number.
The common "in the field" estimate of KW power a 9" motor can handle (for short periods) is 100 KW. So using the above formulas, 144 volt system should be limited to about 700 amps, and the 288 volt system to 350 amps. Still, 135 hp is pretty good for a small car.
3.5 means the engine displacement is 3.5 liters. Engine displacement is the total volume swept by the pistons as they move up and down. All other things being equal more volume will be more powerful when more fuel is injected into the cylinder volume and ignited.
Vehicle Description Section
The fourth through eighth digits describe your vehicle's model, body type, restraint system, transmission type, and engine code.Engine displacement is determined by calculating the engine cylinder bore area multiplied by the stroke of the crankshaft and then multiplied by the number of cylinders. Displacement = (4 in./2) x (4 in./2) x 3.1416 x 3.52 in. x 8 = 353.86 cubic inches.
Each stroke the piston makes performs a displacement. It is the volume of this displacement x the number of cylinders that gives the engine size in liters, cubic centimeters, cubic inch or any other unit of volume.
DISPLACEMENT (Liters and Cubic Inches)
Engines are measured by displacement, usually expressed in liters (L) or cubic centimeters (cc). Displacement is the total volume of all the cylinders in an engine. One liter equals about 61 cubic inches, so a 350 cubic inch engine is about 5.7 liters.Engine Size Chart
| Liters (L) | Cubic Centimeters (CC) | Cubic Inches (CID) |
|---|
| 6.0 | 6,032 | 368 |
| 6.2 | 6,195 | 378 |
| 6.2 | 6,212 | 379 |
| 6.6 | 6,556 | 400 |
How does engine size affect performance? As a larger engine is usually able to burn more fuel and produce more power than a smaller one, a car with a larger, more powerful engine is likely to be able to accelerate faster and tow heavier loads than a car with a smaller engine can manage.
Calculate the amps used by dividing the wattage by the voltage. For example a 500-watt motor -- running on 50 volts -- will draw 10 amps. A motor with the same wattage -- running on 20 volts -- will use 25 amps.
Wattage - Wattage is the total amount of power the application uses. It's calculated by multiplying voltage by amperage. Therefore the 120 VAC x 0.3 Amps equals 36 Watts. DC Voltage - Output Voltage is rating of your battery system, usually a single 12 volt battery.
Equivalent Volts and Amps Measurements
| Voltage | Current | Power |
|---|
| 12 Volts | 0.8333 Amps | 10 Watts |
| 12 Volts | 1.25 Amps | 15 Watts |
| 12 Volts | 1.667 Amps | 20 Watts |
| 12 Volts | 2.083 Amps | 25 Watts |
Equivalent Watts and Amps at 12V DC
| Power | Current | Voltage |
|---|
| 5 Watts | 0.4167 Amps | 12 Volts |
| 10 Watts | 0.8333 Amps | 12 Volts |
| 15 Watts | 1.25 Amps | 12 Volts |
| 20 Watts | 1.667 Amps | 12 Volts |
When calculating the current draw in amps with a 12 VDC Motor you can use the following guidelines: 0.1 HP = 8 amperes. 0.2 HP = 17 amperes. 0.5 HP = 42 amperes.
Amps = Watts / Volts
4160 Watts / 208 Volts = 20 Amps.Equivalent Watts and Amps at 120V AC
| Power | Current | Voltage |
|---|
| 900 Watts | 7.5 Amps | 120 Volts |
| 1000 Watts | 8.333 Amps | 120 Volts |
| 1100 Watts | 9.167 Amps | 120 Volts |
| 1200 Watts | 10 Amps | 120 Volts |
Equivalent Amps and Watts at 120V AC
| Current | Power | Voltage |
|---|
| 1 Amps | 120 Watts | 120 Volts |
| 2 Amps | 240 Watts | 120 Volts |
| 3 Amps | 360 Watts | 120 Volts |
| 4 Amps | 480 Watts | 120 Volts |
