If the electric motor is a commutator, to increase its speed or increase the voltage or reduce the load on the shaft. But remember that, first, the power generated by the engine, in any case should not exceed that to which it was designed. And secondly, that many brushed motors, especially with sequential excitation, when working without load without reducing the voltage supply to accelerate to inadmissibly high speeds. Both threatened release of motor failure. Shunting of the field winding is a method to increase momentum, to resort to which is allowed is not always - it can cause a strong overheating of the engine.
Engines with electronic control windings, in which feedback is used often in properties very close to the manifold - is that they do not tolerate reverse polarity. If you had the electronic engine has the following properties, try to increase the speed of its rotation in the manner specified in the previous step, with all their respective limitations apply to this kind of motors.
The rotation frequency of induction motorfed directly from the mains, can also be adjusted by changing the supply voltage. But this method is extremely inefficient: the dependence of speed on voltage is very non-linear, varies greatly the efficiency. For motors of the synchronous type, this method is unsuitable. Therefore, it is better to use the so-called three-phase inverter. It allows you to regulate the speed not only asynchronous but also synchronous motors by frequency variation. Select a device of this type is that it provides in reducing the frequency of simultaneous reduction and voltage, to account for reduction of inductive resistance of the windings. There are inverters for single-phase motors with magnetic shunt, and a two-phase condenser motors.
Avoid overheating, their spacing increased speed and insulation breakdown in high voltage (including self-induction).
Advice 2: How to increase your buttocks naturally
If you are not lucky to be born with a beautiful shape of the buttocks, you know what it takes to achieve their perfect shape. Though this may seem strange, many people would like to increase the size of buttocks and make them firmer, but I don't know where to start. There is a natural way to increase buttocks without surgery or artificial hairpieces.
The rear part is including the gluteal muscles, which need to work on the muscles. The appearance of the fifth point can be corrected with exercise and diet.
- Get regular physical activity. Workout 3 or 4 times a week will train the body to burn the calories that you consume during the day. At least one or two days of training will be devoted to the study of the gluteal muscles and the other days do cardio or your favourite sport.
- Do squats at the gym or home. Stand up so that her feet were at shoulder level. Bending your knees, squat and try to reach the point that your thighs are parallel to the floor. The back part will stick out slightly. Hold the weight on your heels and elongate your spine. Do this exercise 15-20 times in 2-3 sets.
- Lie on your back, hands along the body. Raise your legs up and bend them at the knees at an angle of 90° so that the bottom of the feet perpendicular to the floor. Slowly lower one leg and tap my foot to the floor then return to starting position. Repeat this exercise, alternating legs, until you get tired. This exercise is working the lower part of the buttocks.
- Stand with your feet shoulder width apart and stay on one foot, holding the balance. Keeping both legs straight, pull your raised leg to feel the contraction of the gluteus Maximus. Do this 10 times, switch legs and do as many approaches as you can.
- Carry on with the exercise, including cardio, such as Jogging, running, or use the trainer on days when not doing exercises to strengthen the buttocks. Initially, you may notice a decrease in the size of the buttocks due to fat burning. Continue to consistently engage in, and the fat will change to muscle mass and a healthier fat, which appears due to the change in diet.
- Limit your intake of simple carbohydrates. Glucose contained in candy, soft drinks and white bread, for example, the first gives a burst of energy, but the unused sugar quickly processed into fat. This fat will be deposited in the buttocks, thighs and other parts of the body and will adorn your figure that you are trying to change.
- Replace simple carbohydrates to complex, for example, whole grains and pasta from durum wheat. They are more hearty and not so quickly turn to fat like simple carbohydrates, so you are left with more time to shred them in the gym. Complex carbohydrates also supply the muscles with plenty of energy for training.
- Eat food rich in proteins. Salmon, lean beef, chicken and eggs are excellent examples of useful proteins that you can include in your diet. Proteins help the growth and strengthening of muscles after damage in training. Consumption of these foods will help you achieve the desired size and shape of the buttocks.
Advice 3: How to reduce the speed of the motor
Electric motors allow the speed control to a considerable extent. Method of adjustment of this parameter depends on the motor type. Some engines allow adjustment in different ways and their combinations.
Control of commutator motor with a permanent magnet on the stator produce a change in voltage on the windings of the rotor. The dependence of the rotation frequency of the engine is on the voltage is close to linear.
Adjustment of engine speed with electronic control and feedback (e.g., used in computer fan) perform similarly, but remember that the dependence of the number of revolutions of the voltage will be somewhat less like linear. The reversal of such motors is not allowed.
To change the number of revolutions of the commutator motor with independent excitation, maintaining a constant voltage at the stator winding to change the voltage on the windings of the rotor.
To adjust frequency of rotation of the motor with serial excitation fed from the AC mains, use a special thyristor regulator. Many of the tools equipped with them originally. Do not use regulators, not designed specifically for such engines.
To change the speed of the synchronous motor, proportionally change the frequency of the mains voltage. By reducing the frequency and simultaneously reduce the voltage so that the current through the motor windings is not increased. If the voltage does not decrease, the current for reducing the frequency may increase because of lower inductive reactance of the windings. This regime is dangerous for the engine.
To reduce the frequency of rotation of an induction motor, use in the same way. If this is not possible (for example, in the absence of the three-phase inverter), just lower the voltage without changing the frequency. If the motor is single phase, it is convenient to use Latrom. In any case, do not use thyristor regulators in conjunction with any motors that are not manifold.
Advice 4: Why float the engine rpm
A situation in which for no apparent reason and without any action by the driver rpm idling spontaneously and periodically begin to change, is called a floating idle. In some cases, it comes down to the fact that the engine stalls.
Most often, this occurs in engines with electronic fuel injection and is connected with the air suction. Computer control unit injection engines calculate the volume of incoming air cylinders and based on the information received from various sensors, controls the solenoid valves of the injectors. When the air suction sensor throttle position diagnose excess air quantity, and temperature sensor signals the need to reduce the fuel flow. A computer, receiving such conflicting information, it begins to decrease, then to increase the speed of idling. Automatic regulation of the power system is disturbed.On engines with carburetor supply system floating momentum arise from incorrect adjustment of the servo motor or the thrust of the throttle actuator. This fault is found only in those cases if the carb adjustment to start setup from the adjustment screw the idle speed stop screw or the throttle, and turn the little screws all in a row. And if the engine does not react, to forget to return them to their original position. As a result of such unskilled interventions appear dips in the acceleration, floating the revs at idle, increased fuel consumption and other negative effects.On diesels to swim can not only turnovers of idling, but the rpm in the area of 1000-1500 rpm. the Only reason this is a sticking of the movable blades in fuel pump. This only happens if they are rusted. But rust can appear only due to the presence of water in diesel. Usually detected after long Parking of the car. Experienced drivers, before you leave your diesel car for a long time, fill the fuel tank with a quart of motor oil and the last day of driving this fuel. Diesel, of course, smoke, but all details of fuel pump are covered with a thin protective oil film.In addition, floating the revs may be due to the following reasons: improper operation of the ignition system, incorrect operation of the flow meter or the lambda sensor, sensors, air flow, coolant temperature, air temperature. And also change the settings of the control UNIT, contamination of the nozzles or poor quality gasoline.
Advice 5: How to check asynchronous motor
Asynchronous motors three-phase current are widely used in various industries, including automotive. The principle of operation of the engine based on the conversion of electrical energy of alternating current into mechanical energy through the use of a rotating magnetic field. In some cases it is necessary to check up correctness of connection of windings of the motor.
You will need
- - battery;
- - megger;
- - millivoltmeter.
To check the correctness of connections of three-phase windings it is necessary to define the beginning and end of each phase. Prepare for this and megger millivoltmeter.
First, if using a test light determine the identity of a separate coil terminal phase. Then to one of the phases connect through the switch the constant current source. The power source must be such that the winding of the electric motor passed a small current (battery volt 2B). In the circuit include a resistor to reduce current.
Turn on the switch. At the beginning of the electrical connection, and also at open circuit in the windings of the remaining two phases will be induced electromotive force. The direction of the electromotive force is determined by the polarity ends of the windings check the phase, which includes a rechargeable battery.
Note that the direction in which they turn on and off switch is deflected needle of a millivoltmeter, which must be alternately connected to the output ends of the other two phases. If to "the beginning" connected "plus" of the battery, and the "end" - "minus", then the off-switch on the other phase will be a "plus" on the initial findings and the "minus" end. On closing the circuit the polarity on the remaining phases will reverse the above.
If electricmotor has three pins when connecting a winding of the type "triangle" or "star", check the cable connection by connecting a lower voltage to two conclusions. In this case, the voltmeter measure the voltage between the third output and other findings connected to the network. If the connection is correct, these stresses will be equal to half the magnitude of the voltage applied to two conclusions.
Describes the measurements guide at least three times, each time summing up the current to a couple different conclusions. If a phase is connected is incorrect, when two attempts of the three voltage between the third terminal and the rest will be different.
Advice 6: Why drop the engine speed
Today all vehicles: cars, motorcycles, airplanes, four-stroke engines, i.e. piston internal combustion engines, where the working process in each cylinder occurs over two revolutions of a crankshaft (4 stroke).
The rpm of the engine at idle can be erratic on a number of factors. It all depends on the brand of car. Cause malfunction of engine idling can be not only a carb, but, for example, the system, influencing the magnitude of the vacuum in the intake manifold of the engine.If the engine "roars" after the discharge of gas (when the accelerator pedal is released), you need to check the throttle valve of the secondary chamber. The source may be sticking open due to debris on the walls of the diffuser. Throttle the second chamber is opened with a vacuum actuator automatically when the engine reaches a certain rpm (about 3500 rpm). At the time of opening of the damper comes in a transitional system of the second camera. If the carburetor is clogged the nozzles and channels of this system, it happens to be a short sharp drop in rpm of the engine. The transition system works with a small angle of rotation of the flaps, so upon further opening of the throttle fuel immediately enters into the second chamber without entering the transition system. To eliminate this drawback it is necessary to wash the carb.If at sharp reset of gas the revs drop down to a full stop the engine, you should repair the system idling. Sustainable return to continuously maintain the idle speed of about 700-800 rpm is one of the checks of its system. Another reason for this phenomenon is a malfunction of the control unit of idle econimizer.When shifting gears with the second gear to the third, i.e. at a medium speed (3000-3500 rpm) the work included the secondary chamber of the carburettor. If there is a delay of inclusion, the mixture perebegaet, and the acceleration will be zero. To eliminate this problem from the secondary pneumatic actuator chambers to remove the spring. After that dynamics will return to normal, increase elasticity, i.e. to switch to a lower gear will have less.