Re: [QUAD-L] Fastest MWD Chair?

[Martin T Brown]

Motor No: 1 - 400 Watt Peak rated Power consumption     680 W     Rated Voltage x Peak current       Rated Voltage     24 V     Normally 24V       Continuous Current     23.5 A     Continuous current @ 25C with free convection       Rated Torque     24.4 Nm     @ Continuous current @ gearbox drive shaft       Rated Speed     133 rpm     @ Continuous torque @ gearbox drive shaft @ 24V       Efficiency at rated speed and torque     49 %     @ Rated torque and speed @ gearbox drive shaft       Peak Current     80 A     Rated for 60s @ 25C with free convection       Peak Torque     67.7 Nm     @ 70A @ gearbox drive shaft       Gearbox ratio     1/32           minimum Brake Torque @ drive shaft     4 Nm           maximum Brake release current    0.5 A           Mass     8.2 kg          This is a normal configured motor that we use on one of our models, notice the "Rated Torque & Speed" here is the same motor with greater speed, notice the changes. Motor No: 2 -  400 Watt Peak rated Power consumption 635 W Rated Voltage x Peak current Rated Voltage 24 V Normally 24V Continuous Current 23.5 A Continuous current @ 25C with free convection Rated Torque 15.4 Nm @ Continuous current @ gearbox drive shaft Rated Speed 202 rpm @ Continuous torque @ gearbox drive shaft @ 24V Efficiency at rated speed and torque 47 % @ Rated torque and speed @ gearbox drive shaft Peak Current 65 A Rated for 60s @ 25C with free convection Peak Torque 43.3 Nm @ 70A @ gearbox drive shaft Gearbox ratio 1/21 minimum Brake Torque @ drive shaft 4 Nm maximum Brake release current 0.5 A Mass 8.2 kg -- Martin T. Brown Director Radical Holdings (Pty) Ltd T/A Radical Mobility (O) +27 11 664-6069 (F) +27 11 955-3743 (C) 082 500 9406 [EMAIL PROTECTED] www.radicalmobility.com "Engineering Mobility for Accessibility" [EMAIL PROTECTED] wrote: According to my wheelchair Lady there is a couple things you need to remember about purchasing a high-speed wheelchair.  You are going to need to make sure you have the electronics set at a safe speed for turning so you do not tip over and she also told me that the higher the speed the less torque you have in the motors.  She has sold high-speed wheelchairs and most of her clients are unhappy with them because the lack of torque.  She ends up putting in the standard motors and now she does not recommend those types of chairs.  Just my 2 cents.   Jim No virus found in this incoming message. Checked by AVG Free Edition. Version: 7.1.405 / Virus Database: 268.12.8/455 - Release Date: 2006/09/22