motorthermalsolution

[motorthermalsolution]

A Quick Look at Mobike Motors

A motorbike is a two-wheeled vehicle with an engine that propels it forward. The machine's forward movement is provided by this motor, which is usually an internal combustion engine. The essence of motorcycle forward mobility is dictated by the theory of gyro motion, in which the centripetal and centrifugal forces balance each other when the bike is in motion. Both of these forces work together to keep the bike stable while in motion. Forward momentum (Mass x Velocity) is critical for the motorcycle's stability when in motion. The centripetal and centrifugal forces are balanced by this forward motion. The power generated by the internal combustion motor or engine is used to propel the vehicle forward. The motorbike engine can be either gasoline or diesel powered. However, currently there is also the possibility of using electric power for traction.

The engine is nearly always situated slightly below the gas tank on motorcycles. This posture lowers the bike's center of gravity and improves the machine's stability. The motorcycle is propelled forward by the engine, which provides traction via a steel chain attached to the back wheel. Rear-wheel drive is standard on all motorcycles. This metal chain transmits power from the back wheel to the front wheel.

The construction of a motorcycle motor is relatively straightforward. It is made up of one or more pistons that move in a chamber or sleeve. An electric spark propels the object forward. The electric spark ignites a gas-air mixture, which releases gases that cycle up and down the pistons. When the pistons move, power is transferred to a mechanism that drives a connecting chain to the back wheel. All motorcycles use a rear-wheel drive system.

The movement of the piston generates the power provided by the motorcycle engine. The power is transferred to the crank, which in this case is the chain, when the pistons move. The piston in the cylinder may move in two or four strokes during its cycle of motion. Two-stroke engines are easier to maintain due to their simpler structure. In comparison to four-stroke engines, they also produce more operating power. Four-stroke engines, on the other hand, are more environmentally friendly and provide a smoother ride on the road. Four-stroke engines also have the advantage of being able to have many cylinders. As a result, more operating power is available. The power stroke is the second stroke in two-stroke engines, while the power stroke is the fourth stroke in four-stroke engines. A single piston movement is referred to as a stroke.

A rated capacity is present in all motorbike motors. This capacity is proportional to the volume of the piston's operating chamber. These motors can range in size from 25 cc to 1500 cc. The production of power is directly proportional to the capacity of the pistons and chamber. Brake horse power is another term for this.

An electric spark is used to ignite the bike motor. This starts the pistons in action by igniting the gas-air mixture in the chamber. A dynamo is responsible for this spark. Previously, all motorcycles had to be started with a kick. By pushing a lever down with the leg, the bike was started. However, the self-start feature is now available on newer motorcycles. A starter motor fires the pistons in such bikes.

The current on previous motorcycles was supplied by a magneto. Capacitor Discharge Ignition is now used on the most recent motorcycles. CDI systems have a stronger ignition current, making it easier to start the bike. Kawasaki was the first to use this technology on motorcycles.

[motorthermalsolution]

Thermal Overload Protection for Motors

We can discuss the operating concept of three phase induction motors to better comprehend motor thermal overload prevention in induction motors. A three-phase winding is symmetrically dispersed on the inner periphery of the stator, which has one cylindrical stator. When three phase power is given to the stator winding, a spinning magnetic field is formed due to the symmetrical distribution. This field spins at a constant rate. The rotor of an induction motor is made up of a number of solid copper bars that are shorted at both ends to form a cylinder cage-like structure. Because of this, the motor is also known as a squirrel cage induction motor. Anyway, let's get back to the fundamentals of three-phase induction motors, which will help us grasp the concept of Saftty overload protector.

There will be an induced circulating current flowing through the bar conductors as the rotating magnetic flux cuts each of the rotor's bar conductors. When the rotor is at rest and the stator field is spinning at synchronous speed, the relative motion between the rotating field and the rotor is at its greatest.

As a result, the rate of flux cuts with rotor bars is highest, and the induced current is highest. However, because this relative speed is the source of induced current, the rotor will attempt to lower this relative speed by rotating in the direction of the rotating magnetic field in order to achieve synchronous speed. As soon as the rotor reaches synchronous speed, the relative speed between the rotor and spinning magnetic field becomes zero, and no additional flux cutting and, as a result, no induced current in the rotor bars occurs. When the induced current is zero, there is no longer any need to maintain a constant relative speed between the rotor and the rotating magnetic field, hence the rotor speed decreases.

When the rotor speed decreases, the relative speed between the rotor and the rotating magnetic field increases, causing induced current in the rotor bars. The rotor will then strive to regain synchronous speed once more, and this will continue until the motor is switched on. The rotor will never reach synchronous speed or cease running during normal operation as a result of this phenomena. Slip of an induction motor is the difference between the synchronous and rotor speeds in relation to the synchronous speed.

Depending on the loading situation of the motor, the slip in a properly functioning induction motor typically ranges from 1% to 3%. Now we'll try to draw the speed current characteristics of an induction motor using a huge boiler fan as an example.

The Y axis is measured in seconds, whereas the X axis is measured in percent of stator current. When the rotor is at rest, or in the beginning position, the slip is greatest, so the induced current in the rotor is greatest, and the stator will draw a large current from the supply due to transformation action, which will be roughly 600 percent of the rated full load stator current. When the rotor speed reaches 80 percent of synchronous speed, the slip is reduced, and the rotor current, and thus the stator current, falls to roughly 500 percent of the full load rated current within 12 seconds. As the rotor returns to its regular speed, the stator current drops rapidly to the rated amount.

Now we'll talk about thermal overloading of electrical motors, often known as overheating, and the importance of motor thermal overload prevention.

The first thing that comes to mind when we think about a motor overheating is overloading. Because the motor is mechanically overloaded, it demands more current from the supply, causing the motor to overheat. If the rotor is mechanically locked, or becomes immobile due to any external mechanical force, the motor can overheat. In this case, the motor will take an overly high current from the supply, resulting in thermal overloading or severe overheating of the electrical motor. Low supply voltage is another cause of overheating. Because the amount of power drawn from the supply relies on the motor's load, a lower supply voltage means the motor will demand more current from the mains to maintain the appropriate torque. Single phasing also causes the engine to overheat. When one phase of the supply goes out of service, the remaining two draw more current to keep the load torque constant, causing the motor to overheat. Because an unbalanced system resulting in negative sequence current in the stator winding, an unbalanced condition between three phases of supply also causes overheating of the motor winding. Again, the motor may overheat as a result of the abrupt loss and reestablishment of supply power. Because the motor is de-accelerated owing to a rapid loss of supply voltage and then accelerated to achieve its rated speed when the voltage is restored, the motor consumes more current from the supply.