RE: (ET) Mower motor strength requirements

["Chris Tromley" <chris_t microtrac com>]

Title: Message

Hi Darryl,

 

That's interesting.  Does anyone know what kind of motor the CMM1000 uses?  A series or "universal" motor should slow down and draw more amps in "tough cut" situations.  As the amps go up, the torque goes up.  Way up.  So the motor would slow down, but be very hard to stall.  Unless the batteries can't put out the amps.  If that's the case, putting in some surplus Hawkers might solve your problem nicely.

 

If the motor is PM, we're outside my realm of understanding.  But I think that PM motors don't have the huge bottom-end grunt that series/universal motors do.

 

Chris

 

P.S.  As a point of reference, my B&D corded mower (universal motor) works fine in heavy cutting.  It slows down, but never enough to matter much.

-----Original Message-----
From: elec-trak-bounces cosmos phy tufts edu [mailto:elec-trak-bounces cosmos phy tufts edu] On Behalf Of D Howell
Sent: Friday, June 04, 2004 4:03 PM
To: Markus Lorch
Cc: Elec-trak cosmos phy tufts edu
Subject: Re: (ET) Mower motor strength requirements

Markus, the strange thing about the B&D is that the motor is rated at 5 peak HP.  That's so far from reality that it's a laugh.  My major complaint about the B&D CMM1000 I own is that it's too weak and doesn't cut well in my opinion.  I believe the "bad cut" to be related to the blade slowing too much in tough cut situations.  When the batteries are at full charge, it doesn't seem to be afficted as much with the cut problem.  If I had to guess at the real HP of this mower, I'd put it about 3/4.  I know how much power 3, 4, 5 hp motors have and this ain't even close.

 

Darryl