What is the torque angle method?
With the torque- angle tightening method an initial tightening torque is specified, known as a snug torque (whose purpose is to pull – or ‘snug’ – the plates of the joint into metal to metal contact). An angle of turn is then specified for the bolt/nut to be rotated through.
How do you calculate angle torque?
A practical way to calculate the magnitude of the torque is to first determine the lever arm and then multiply it times the applied force. The lever arm is the perpendicular distance from the axis of rotation to the line of action of the force. and the magnitude of the torque is τ = N m.
Why is torque angle used?
Put into its most simple terms, torque angle replaces a maximum torque value for a fastener with a specific amount of fastener rotation. After setting a low baseline torque, just to make sure the fastener is set, the fastener is rotated a precise amount to set the final position and clamp load.
Can you reuse torque to angle bolts?
Torque + Angle Generally, externally threaded fasteners tightened to this specification method can be reused unless otherwise specified in the service information.
Do you use a torque angle gauge?
Drive Torque Angle Gauges are required when servicing many late model engines that use torque-to-yield fasteners.
What is the load angle?
Load angle is nothing but an angle different between stator axis and rotor pole axis of the synchronous motor. For ideal motor, the load angle is zero since the rotor poles aligned with stator poles, but in practice, this is not possible. It is also called a power angle, torque angle and coupling angle.
What is the value of load angle?
Maximum excitation power occurs at 90° and maximum power due to reluctance occurs at 45°. Therefore, the maximum power developed in salient pole synchronous machine occurs at load angle less than 90°. An alternator power output is directly proportional to the sine of its load angle.
How do you change the load angle?
This means, as the mechanical power input to the synchronous generator is increased through prime mover, the field poles will be dragged ahead of the stator pole or flux. This in turn will increase the load angle.
What is the torque angle δ?
Torque angle δ is the angle between Rotor flux and Stator fluxes, both are rotating at synchronous speed. It is noted that for synchronous motors the rotor flux axis lags the stator flux axis by the angle δ as shown in figure. Synchronous Motor with Stator and Rotor Fluxes.
When torque angle is 90 degrees the torque of synchronous motor is?
Answer : The synchronous motor will develop maximum power when the load angle is 900. Answer : The maximum constant load torque under which a synchronous motor will pull into synchronism at rated rotor supply voltage and frequency is known as pull-in torque.
What is the load angle of alternator?
Now, load angle is a angle between the stator and rotor fields. In general the theta can change from -90 to + 90 deg. In practice it’s much smaller (20-40 deg at rated load). The load angle is very important – it’s closely connected with real and imaginary power generated by a generator.
What is pull out torque in synchronous motor?
Pull out Torque: At load angle 90 degree the motor produces the maximum torque. Further increasing the loads, the magnetic locking between the stator and rotor become weak. Then the motor stops. Therefore, the maximum torque is produced by the motor without loss of synchronism is called pull out Torque.
How do you increase pull-out torque?
Pull-out Torque If all other parameters remain constant, increasing the rotor resistance will: Reduce the speed at which maximum toruqe occurs. Increase the starting torque (until spo=1 ) Increase slip for a given torque.
What is the difference between a pull in torque and a pull-out torque?
Pull-out torque is the maximum torque that can be delivered without losing steps. It reaches its maximum at the lowest frequency or speed, and decreases as frequency increases. Pull-in torque is the maximum torque at which a motor can start rotating at a given frequency.