This section of the BSCRA web site is for technical information on slot car motors.
The first article is a detailed analysis of the Falcon 7 motor used in the 1/32 Production
class and several similar motors. The analysis was done to assess what alternative
motors might be considered.
Motors Used in BSCRA Racing
The motors used in BSCRA racing are 3 pole permanent magnet dc type.
How does that work? The permanent magnets are either side of the motor, these
are fixed to the motor case. The rotating part (known as the armature) is in between
the magnets. On one side, a north magnetic pole faces the armature, on the other
side a south magnetic pole faces the armature. Coils of wire are wound on the armature.
An electric current is passed through these coils. The current in each coil is
switched so it is attracted and repelled from the magnetic poles as the armature
rotates. The commutator switches the coils at the right time to make the armature
These days the motors used are 3 pole - that means there are 3 coils of wire on the
armature, and 3 segments on the commutator to switch them. The commutator is cylindrical
copper with 3 segments, the current reaches the copper segments through a pair of
brushes pressed against it. These brushes are generally solid pieces of copper carbon,
not literally a brush (in the very early days of electric motors the equivalent did
look like a brush and the name has stuck).
This article is about the motors that are used in the great majority of modern slot
cars. However, I’ll briefly mention several other types of motor that could be used
in a slot car. For example 5 pole armatures were sometimes used. The earliest
slotcars had an electromagnet instead of the pair of permanent magnets. Some decades
ago, a single permanent magnet was used with iron pole pieces either side to produce
magnetic poles either side of the armature. There have been some experiments with
fitting modern brushless motors in slot cars.
Motors Approved for BSCRA Racing
Some BSCRA classes are limited to approved motors, other classes allow a free choice
of motors. Below is a list of the manufacturers of approved motors. Click on the
link for details of each manufacture's motors.