NetGain Motors AmP 8, Owner'S Manual, Page: 19 / 34

vehicle will lead to the motor heating up and being overworked and possibly leading to motor failure. Choosing
a motor that is too big for an application may lead to the motor “lugging” which will normally result in
Selecting EV Components
commutation problems over time, and eventually to other motor problems.. For the best electric vehicle
experience, it is essential that the electric motor be carefully sized to the vehicle for which it is intended. Simply
using a “bigger motor” for a larger or heavier vehicle is not necessarily the best way to match components.
Likewise, choosing a motor that is simply too small for an intended application is also likely to end up with an
undesired result as the motors may overheat.
Many factors are used to determine which motor is suitable for the weight (and aerodynamics) of the vehicle to
be propelled and the speed which is to be maintained. There are some online tools which can tell you how a
vehicle might perform under varying conditions, such as:
http://www.evconvert.com/tools/evcalc/ But, even
excellent tools such as this cannot take all the various battery, controller, and motor options into account.
NetGain Motors, Inc. is will assist Authorized Motor Dealers or their customers in trying to size the right
motor for their particular application, however we prefer to provide the Authorized Motor Dealer with the
information so that they remain the primary point of contact with the customer. In order to assist Authorized
Motor Dealers in motor selection, we need to be provided with as much of the following pieces of information
as possible:
• Battery Pack Information
◦
Voltage
◦
Internal resistance
◦
Discharge capabilities
•
Motor Controller
◦
Voltage capabilities
◦
Amperage capabilities
• Vehicle Characteristics
◦
Vehicle weight (after conversion)
◦
Top speed to be maintained on level terrain
◦
Top speed to be maintained on grade
◦
% grade
◦
Gear ratios of transmission
▪
Gear efficiency
◦
Rear differential gear ratio
◦
tire diameter
▪
Type of tire/surface (i.e. rubber on concrete)
◦
Coefficient of drag
◦
Frontal area
It is possible that the customer will have unrealistic goals, objectives, or understanding of a technology they are
unfamiliar with. It is unlikely that you could suggest a motor combination that would provide a 0-60 MPH of
2.9 seconds and a top speed of 250 MPH with direct drive in a 4,000 lbs vehicle at 48 Volts.
Direct driving a vehicle with an electric motor sounds simple, and it is the first thing that many people believe
they want. However, to properly direct drive a vehicle considerations must be given to the safety of the vehicle
and the workmanship of the conversion. A mistake in wiring a direct drive conversion leaves little room for
DRAFT VERSION 1.1 Tue, April 18, 2017 - Copyright© 2015 ,2016,2017 All Rights Reserved, NetGain Motors, Inc . Page 019 of 34 Pages