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Electric motor dangers to pregnant women?

20 messages,  Last post on Feb 09, 2009 at 1:45 PM

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#9 of 20 by saidiadude Oct 18, 2008 (11:47 am)
Good question HybridBen. I was wondering the same thing. 2 Follow up questions:   - Have any studies been formally done to show EM readings inside the cabin? I recall reading a post on this forum where a user had measured the readings in his/her car.    - Has Toyota improved the shielding for the 2010 Prius? I guess we'll find out in a few months.   Ideally, it would be great to have formal readings that compare the inside of a Prius and a non-hybrid (say Corolla or Camry) Replies to this message: randyl712 (Oct 18, 2008 5:08 pm)
#10 of 20 Re: [saidiadude] by randyl712 Oct 18, 2008 (5:08 pm)
Replying to: saidiadude (Oct 18, 2008 11:47 am) This is nonsense until and unless there is any evidence. Why don't we speculate on the EM reading of a normal car, which also has electrical wiring running throughout. Why don't we speculate on how the voltage affects your ability to read minds? It's all just conjecture, and completely useless at this point. Move on.
#11 of 20 by saidiadude Oct 19, 2008 (8:10 pm)
Evidence: Childhood cancer in relation to distance from high voltage power lines in England and Wales   There are lots of studies that show a relationship between cancer and high voltage. To be fair, there are (older) studies that show no relationship between the two. The Prius (and other vehicles with electric motors) have a high voltage system. If Toyota shielded the cabin adequately, then it should not be an issue. That's why I'd like to see actual readings and compare them to readings inside a "regular" car. You may find the above to be nonsense, but some of us are concerned about our health and the health of our passengers. I'd like to minimize chances of contracting any form of cancer. Replies to this message: randyl712 (Oct 20, 2008 6:52 am)
#12 of 20 Re: [saidiadude] by randyl712 Oct 20, 2008 (6:52 am)
Replying to: saidiadude (Oct 19, 2008 8:10 pm) Talk about a stretch - even the study's conclusion says that only 1% of the leukemia could possibly be attributable to the power lines, "though this estimate has considerable statistical uncertainty" and that "the relation may be due to chance".   Try again.
#13 of 20 EMF by pat85 Dec 10, 2008 (9:10 am)
High Voltage power lines in the US are 40 thousand Volts Alternating Current. The Hybrid batteries are a few hundred Volts DC (direct current) Huge difference   Further, as far as the electric motor, it is in front of the engine and under the hood. This is what's known as a Farraday shield. Why a car is the safest place in lightning is because it is steel and is a Farraday shield.  As far as the cables from the batteries under the rear seat to the electric motor, the cables are conducting current to and from the motor.. It is an electric circuit. The current is flowing from the positive battery terminal and returning to the negative terminal. That means that EMF induced by the positive is cancelled by the EMF induced by the negative currents. The EMF's are self cancelling.   If the magnetic fields are a concern, they are described in Maxwell's Equations. Firrst, there are no magnetic dipoles. The Delta operator times the B vector field is zero. There are magnetic field generated by a wire carrying current, Each wire induces a magnetic field according to,the right- hand-rule. If the thumb is pointed in the direction of the current, the magnetic field lines will be in the direction of the curled fingers. If you do that for both wires from the hybrid battery, current is going in opposite directions, so the currents induced by varying magnetic fields cancel.   Replies to this message: stevedebi (Jan 15, 2009 2:28 pm) wwest (Jan 16, 2009 7:59 pm) stevedebi (Jan 21, 2009 4:38 pm)
#16 of 20 Re: EMF [pat85] by stevedebi Jan 15, 2009 (2:28 pm)
Replying to: pat85 (Dec 10, 2008 9:10 am) "Further, as far as the electric motor, it is in front of the engine and under the hood. This is what's known as a Farraday shield. Why a car is the safest place in lightning is because it is steel and is a Farraday shield. "   I thought the lightning safety was due to having rubber tires between the metal of the car and the ground, thus having no path for the lightning to pass through? Replies to this message: wwest (Jan 16, 2009 7:59 pm) stevedebi (Jan 21, 2009 4:38 pm)
#17 of 20 Re: EMF [stevedebi] by wwest Jan 16, 2009 (7:59 pm)
Replying to: stevedebi (Jan 15, 2009 2:28 pm) You think lightning that has just jumped across a cloud to ground (or VV) 5000 ft gap will see any problem with the wheel to ground gap....??   The car's metal roof and "shell" is a much better conductor than is your body.....   And a farraday shield is used to block, "divert", or suppress electromagnetic waves and maybe some level of electrostatic coupling. No affect on lightning one way or another insofar as I know. Replies to this message: stevedebi (Jan 21, 2009 4:38 pm)
#18 of 20 Re: EMF [wwest] by stevedebi Jan 21, 2009 (4:38 pm)
Replying to: wwest (Jan 16, 2009 7:59 pm) "You think lightning that has just jumped across a cloud to ground (or VV) 5000 ft gap will see any problem with the wheel to ground gap....??    The car's metal roof and "shell" is a much better conductor than is your body.....    And a farraday shield is used to block, "divert", or suppress electromagnetic waves and maybe some level of electrostatic coupling. No affect on lightning one way or another insofar as I know. "   Lightning will probably follow a different course to ground if offered one that goes to the ground (like a tree) as opposed to one that is insulated by rubber.   I didn't make the claims about a farraday shield, that was a previous post.

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