A series dc motor does not have a well defined maximum speed, which depends on the friction in the bearings. It is dangerous to run this type of motor without a load because it could be damaged by excessive speed.
Series motors are normally attached to massive loads, like trams or trains, which limits the speed, and the very high starting torque is useful for traction because it removes the need for a gearbox.
Hemmings Motor News.
calculate the synchronous speed from the frequency & the no. of magnetic poles in the stator, then measure the actual speed of it with a tachometer, then subtract the actual speed from the synchronous speed.
The speed sensor in located in the front of the motor. You can find it near the transmission and the engine split line on the Jetta.
it comes with a dohc 1.6L (b-series) or a sohc 1.6L(d-series) you can find out by looking at the motor.
If all speeds do not work, suspect the fuse, the switch, the switch connector or the blower motor. If only high speed works, suspect the blower motor speed resistor. If low speeds work and not high, suspect the blower motor relay.
increase the cfm for the ahu
The speed sensor is at the back of the transfer case behind the handbrake. Series 2 can use a signal from the auto trans.
Not knowing what year S10 you have, you can generally find the blower motor high speed relay nearby the blower motor on the firewall. The resister for the other lower speeds is also found close by the blower motor.
First and foremost you should look at the nameplate. If the nameplate is unreadable then you will do no harm plugging it into a 115 volt supply. If the motor looks like it is running at full speed then it is a 115 volt motor. If you plug it in and it looks like the shaft is turning at about half speed then it is a 230 volt motor. If the motor is running slow don't leave it plugged in for more that 15 seconds. Find a 230 volt supply and plug it in, it should run at the right speed. If you have a shaft tachometer use it on the end of the shaft to get an accurate rotation speed. The above prompted comparison with another motor, with the same RPM rating, allowing a simple feel of the shafts for a close speed match. The help is appreciated.
I have a 94 caprice that does this. Apparently it is either that speed only on the wiper motor that has a problem or the relay for the high speed may have failed and the motor may be ok. As it is a noncritical issue I haven't worried too much about it. If I find out more I will update this.
Normally when some speeds work and others don't, the problem is a bad, Blower Motor Resistor Pack. You will find it somewhere near the blower motor.
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