There are many causes of such whistling noise coming from a motor. These includes but are not limited to:
Worn out bearing, misaligned shaft, single pahsing, loose body, abnormal speed - all may result in noise
An induction motor rotating at higher than synchronous speed would be generating power, thus would be a generator. No motor operating as a motor runs above synchronous speed.
Dc shunt motor is constant speed motor.Its speed is constant with armature current.This shunt motor is used in paper mills and drilling machines
It is used for sensorless motor control. With vf speed control u can control speed of any induction motor.
Variable speed drivers are necessary to be able to have different speed settings in a motor.
If the squeak changes with fan speed, the fan needs replaced.
It is probably a worn blower motor, because it happens with AC, and/or HEAT. When you brake or speed up, you are changing the speed of the motor (adding and taking away resistance to it's spinning). This will cause more of a noise until you reach your cruising speed again.
If you have a speed adjuster, it is probably making the noise because the speed adjuster is probably off of the gear. For example: speed adj. =3 and gear =4
The sound made by wind is typically described as a howling, whistling, or rustling noise, depending on the speed and force of the wind as it interacts with objects in its path.
As for why it blows only on the high speed you most likely will have a bad blower resister and for the noise, it could be a bad blower motor, bad blower wheel or trash that is stuck in the blower wheel or housing.......
The sound of the wind can vary depending on its speed and the objects it passes through. It can produce sounds such as rustling leaves, howling, whistling through tight spaces, or a gentle whooshing noise.
Theoretically possible as the constricted airspace will increase the airspeed to compensate and the turbulence with the speed can create a whistling type of noise. This is of course theoretical and unlikely.
Factors that contribute to making a fan quiet include the design of the fan blades, the motor quality, the materials used in construction, and the overall engineering of the fan. Additionally, the speed at which the fan operates and the presence of any obstructions can also affect its noise level.
Worn out bearing, misaligned shaft, single pahsing, loose body, abnormal speed - all may result in noise
No load speed is the speed that the motor run when it has no load, i.e., the motor is separated from the engine, that speed is than greater than the rated speed, because the rated speed is the speed whwn the motor are linked to the load and it is the full load.
synchronous motor is a constant speed motor because it will only run at a synchronous speed or not at all.the speed can be changed by changiing the frequency only ns=120f/p
A vacuum leak usually from the intake manifold gasket or brake booster hose/connection will cause a whistle upon partial acceleration. It will usually go away when your foot is off the gas or when more throttle is applied.