The problem with the cheap ones," says Dave Wilson, director at the Fareham site in charge of all testing operations, "is that they have an open commutator motor
and no suppression at all and they're usually housed in some cheap plastic.
In addition, the plant produces low-power commutator motors
used in production of household goods.
All are kicking out brushed commutator motors
and most have replaced them with permanent magnet (PM) AC brushless motors - today's winner with about 70 percent of the numbers of motors in electric vehicles.
Information about the rotor position supplied by the voltage or by an encoder in the case of commutator motors
, for brushless motors, by Hall sensors, or an incremental encoder.
Information about the motor's rotor position can be supplied to the positioning controller either by the voltage or by an encoder in the case of commutator motors
or, for brushless motors, by Hall sensors or an incremental encoder.
Individual chapters are provided concerning permanent magnet DC commutator motors
, permanent magnet synchronous motors, DC brushless motors, axial flux motors, high power density brushless motors, brushless motors of special construction, and stepping motors.
Despite of great variety of motor types (direct current, electronic commutator motors
, synchronous, permanent magnetic field synchronous motors, hysteresis and stepper motors) used, the induction motors are horse of the industry.