what wiper motor
Discussion
Adrian@ said:
Fitting the park switch whilst the cam on the bottom of the gear is still in the park position can break the park switch...you must bring the arms to the upright position on the screen before you start work, by turning the igntion off with the arms in mid wipe. The motor is special to TVR and I have bought the stock to remanufacture them. Adrian@
Ah, so that's why the metal clip in my replacement park switch refused to seat in the unit.It kept coming out of it's sliders and eventually lost itself in the square aperture- never to be tempted out again.
Not wanting to waste £7, I aligned the switch into its position (after packing it with grease), stuck some electrical tape round it and then managed to secure it with a long cable tie. Been A-ok for over a year.
I'll know better next time though..
Spoke to Lucas tech about this exact issue not long ago and he assured me that the 'W' in 14W and 29W does not stand for Watts...
It stands for Wiper, and its a model number.
That said, the armatures in the 29W are slightly longer than the 14W, although the armature diameter is the same, and the number of salient poles, number of windings and diameter of wire appears identical between the two.
If the magnetic flux density provided by the 14W magnets is higher than that provided by the 29W magnets, the stall load of the gearbox might even be the same (F=BIL for those that are interested, where for a given current I, a given motor geometry L, an increase in mag flux density B will increase the torque generated by the motor). Of course, the gear ratio of the worm wheel pair is also of importance when assessing the relative abilities of both motors.
Lets face it, both setups are capable of driving two wiper blades - the note of caution comes when attempting to drive huge long wiper arms with huge long blades on them with a 14W (assuming its performance is in fact inferior to that of the 29W). I reckon the difference in armature length between the two is no more than 25% of the 14W armature length - so the 29W motor might be capable of 25% more torque, not just over 100% more...
Hmm.
It stands for Wiper, and its a model number.
That said, the armatures in the 29W are slightly longer than the 14W, although the armature diameter is the same, and the number of salient poles, number of windings and diameter of wire appears identical between the two.
If the magnetic flux density provided by the 14W magnets is higher than that provided by the 29W magnets, the stall load of the gearbox might even be the same (F=BIL for those that are interested, where for a given current I, a given motor geometry L, an increase in mag flux density B will increase the torque generated by the motor). Of course, the gear ratio of the worm wheel pair is also of importance when assessing the relative abilities of both motors.
Lets face it, both setups are capable of driving two wiper blades - the note of caution comes when attempting to drive huge long wiper arms with huge long blades on them with a 14W (assuming its performance is in fact inferior to that of the 29W). I reckon the difference in armature length between the two is no more than 25% of the 14W armature length - so the 29W motor might be capable of 25% more torque, not just over 100% more...
Hmm.
Edited by ed_crouch on Thursday 15th July 20:13
AH, how do you test the park switch? I've just fitted a new one and it's toast already although after reading this I suspect that's because I didn't fit it with the arms at 12 O'clock.
What should switch to what? With the three wires connected to the switch I get circa 750k ohms to earth from the red and the yellow wires and nothing whatsoever with the blue one. Operating the switch with the gear pulled does nothing.
As an FYI, the brush assembly from the 16W seems to be a good replacement for the 14W assembly (assuming I ever get the motor going again
)
What should switch to what? With the three wires connected to the switch I get circa 750k ohms to earth from the red and the yellow wires and nothing whatsoever with the blue one. Operating the switch with the gear pulled does nothing.
As an FYI, the brush assembly from the 16W seems to be a good replacement for the 14W assembly (assuming I ever get the motor going again
)
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