There is a formula for your problem to refer to for analysis:
Motor power: P=1.732×U×I×cosφ
Motor torque: T=9549×P/n ;
Motor power torque=9550*output power/output speed
Torque=9550*output power/output speed
P = T*n/ 9550
Formula derivation
Relationship between motor power, torque and speed
Power = force*speed
P=F*V ---Formula 1
Torque (T) = Torque (F) * Radius of action (R) It follows that F=T/R ---Formula 2
Linear speed (V )=2πR*rotation speed per second (n seconds) =2πR*rotation speed per minute (n minutes)/60 =πR*n minutes/30---Formula 3
Substitute formulas 2 and 3 into formula 1 Obtain:
P=F*V=T/R*πR*n points/30 =π/30*T*n points
-----P=power unit W, T = torque unit Nm, n minutes = rotation speed unit per minute
If the unit of P is converted into KW, then the formula is as follows:
P*1000 =π/30*T*n 30000/π*P=T*n 30000/3.1415926*P=T*n
In wind turbines, what is the device that connects the power supply and signal transmission between the hub and the nacelle? ?
Translational phenomena are common in life, such as cars moving in a straight line on the road, sliding windows or drawers, and bullets shooting out of the gun chamber. Shooting at objects quickly, and the train moving along the track, these are actually typical translational movements.
And the phenomenon of rotation, such as using a wrenchto tighten a screw, and a windmill rotating to extract water, there are wind turbinestop The rotating movement of the wind blades and the continuous rotation of the hands of the clock are all typical rotation phenomena.
Translation means that all parts of an object move to another place in a certain direction, and the distance moved is the same, which is called translation. Rotation is the continuous circular motion of an object around a certain point or axis.
Basic properties of translation
(1) The shape and size of graphics before and after translation do not change, only the position changes.
(2) After the graph is translated, the line segments connecting the corresponding points are parallel (or on the same straight line) and equal.
(3) Multiple consecutive translations are equivalent to one translation.
(4) The figure after even number of symmetries is equal to the figure after translation.
(5) Translation is determined by direction and distance.
(6) After translation, the corresponding line segments are parallel (or collinear) and equal, the corresponding angles are equal, and the line segments connected to the corresponding points are parallel (or collinear) and equal.
Basic properties of rotation
(1) The distance between the corresponding point and the center of rotation is equal.
(2) The angle between the corresponding point and the line segment connected to the rotation center is equal to the rotation angle.
(3) The graphics before and after rotation are congruent, that is, the size and shape of the graphics before and after rotation have not changed.
(4) The center of rotation is the only point that does not move.
(5) The angle intersected by the straight line connecting a set of corresponding points is equal to the rotation angle.
Wheel hub bearings are important running parts of automobiles. The wheel hub shaft is responsible for reducing the friction resistance of the chassis during operation and maintaining the normal driving of the car. If the wheel hub bearing fails, it may cause noise, bearing heating, etc., especially the front wheel, which may easily lead to dangerous phenomena such as loss of direction. Therefore, wheel hub bearings must be maintained on schedule.
1. Inspection of wheel hub bearings
(1) When checking the tightness of wheel hub bearings, first set up the axle of the wheel at one end of the wheel hub of the car to be inspected, and use a car stool to cover the car. Use wood and other utensils to set up the car safely.
(2) Turn the wheel under inspection several times by hand to see if it rotates smoothly and if there is any abnormal noise. If the rotation is not smooth and there is friction sound, it means the brake part is not normal; if there is no noise, the rotation is not smooth and it is tight and loose, it means the bearing part is not normal. When the above abnormal phenomena occur, the wheel hub should be disassembled and inspected.
For small cars, when checking the wheel bearings, hold the upper and lower sides of the tire with both hands, pull the tire back and forth with both hands, and repeat this multiple times. If it is normal, there should be no feeling of looseness or blockage; if there is an obvious feeling of looseness in the swing, the wheel hub should be disassembled and inspected.
(3) Braking inspection. Usually when checking the wheel hub bearing, the wheel brake device is also checked. If there are oil stains on the inside of the tire, it is likely to be caused by oil leakage from the brake cylinder or brake oil pipe. The cause should be found out and eliminated in time.
2. Maintenance of wheel hub bearings
Before disassembling the wheel hub, preparations for wheel hub maintenance should be made, the car should be parked steadily and the axle should be set up to ensure the safety of maintenance operations. .
(1) Remove the decorative cover and dust cover of the hub shaft head;
(2) Remove the tire nut and tire, being careful not to damage the threads of the tire bolts. If it is a disc brake, remove the brake and use pliers to remove the locking ring or locking pin.
(3) Use special tools to remove the wheel hub;
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(4) Scrape off the old grease in the bearings, journals and hub cavity, clean the hub bearings and journals with detergent and dry them with a cloth, and finally wipe the inner cavity of the hub with a cloth.
(5) Check the wheel hub bearing and bearing race. If cracks, fatigue spalling and loose bearing rollers are found, the bearings should be replaced. If pitting is found on the bearing race, the bearing should also be replaced.
(6) Check the fit between the inner diameter of the bearing and the journal. The fit gap should be no more than 0.1Omm. When measuring the journal, it should be at the upper and lower parts of the vertical ground (this is the largest wear part) Measurement. If the fit clearance exceeds the specified usage limit, the bearing should be replaced to restore the normal fit clearance. It is not allowed to make burrs or pits on the journal to reduce the gap.
(7) After all parts meet the requirements, apply grease to the inner bearing and place it in the wheel hub.
(8) When applying grease to the inner cavity of the bearing, attention should be paid to squeezing the grease into the bearing until the grease emerges from the other side of the bearing. Apply a thin layer of grease to the hub cavity and shaft head cap to prevent rust. Be careful not to apply too much grease in the hub cavity, otherwise it will affect heat dissipation and braking.
(9) Reinstall the wheel hub and outer bearing onto the journal, tighten the shaft head adjusting nut by hand, and then use a shaft head wrench to tighten the adjusting nut to the specified torque. After tightening the nut, you should turn the wheel hub left and right a few times to see how the bearing is installed; on the other hand, make sure the bearing and the seat ring are properly matched by turning. At this time, the bearing tightness is appropriate and the wheels can rotate freely without feeling the axial clearance.
(10) Finally, install the locking plate, fixing nut, tire, dust cover, decorative cover and other parts in sequence.
(11) After the wheel hub bearing is adjusted, drive for a certain mileage (about 1Okm), stop and check, and wipe the temperature of the wheel hub. If it is hot, it is because the bearing has been adjusted too tightly and should be readjusted. Appropriately relax the bearing tightness.