Hall Sensors make PAS Sensors defunct?

[carlbikekits]

An engineering friend of mine claims that I don't need a PAS sensor if I use a hall sensor. I've tried researching what this really means but not finding anything useful.

I intend to use a Cyclotricity front hub 250W wheel. Is there any way of removing the need for a PAS sensor and have an efficiently operated kit?

Any links to YT video or similar much appreciated.

Thanks

 

[matthewslack]

An engineering friend of mine claims that I don't need a PAS sensor if I use a hall sensor. I've tried researching what this really means but not finding anything useful.

I intend to use a Cyclotricity front hub 250W wheel. Is there any way of removing the need for a PAS sensor and have an efficiently operated kit?

Any links to YT video or similar much appreciated.

Thanks

Comparing apples and oranges.

A hall sensor is an electronic component, capable of being used in many different ways. Just one part of doing something.

The PAS sensor is doing something very specific, namely detecting that the crank is turning. And the sensing part of it very likely is one or more hall sensors.

A legal pedelec needs some means of knowing the pedals are turning. If no torque sensor, then to be legal in the UK you need a PAS sensor.

 

[Nealh]

A hall is necessary to interpret the pedal or cassette rotation for a eapc/pedelec, the PAS sensor utilises the hall inside the plastic unit.
My gravel bike uses the cassette to sense the cranks/pedals are rotated via an led that picks up the teeth movement to the controller.
All other biks use a series of magnets and a hall or utilise torque sensing, ultimately a hall will be involved.

 

[richtea99]

https://en.wikipedia.org/wiki/Hall_effect_sensor

The image on that Wikipedia page is probably what your PAS is - a circle of magnets, say 10 or 12, passing by a Hall sensor, firing off impulses to tell your motor the pedals/wheels are rotating, and at what rate they're turning

I'm sure there are other types of PAS too, but a Hall sensor is what's on our two ebikes.

Therefore 'I don't need a PAS sensor if I use a hall sensor ' doesn't quite make sense.

 

[Bikes4two]

Without getting into the technical stuff at all, surely an ebike controller is configured to receive the signal from the PAS and without that signal, the controller won't activate the motor.(Different for skate board and scooter controllers of course.)

The hall sensors inside the motor are there to signal to the controller the position of the motor coils with respect to the motor magnets which in turn produces the 3 phase power to the motor in the correct sequence(phase).

Well, that's my simple understand but I'm a novice on BLDC motor theory so happy to be corrected.