Coreless motor что это
Coreless Motor
Summary: A Coreless Motor is a type of DC motor, which has a specially wound armature instead of an armature wound on an iron core.
Contents
Moving Coil or Coreless Motors
A type of Direct Current motor, which is different in construction than that of the usual can motor. Instead of a large rotating iron armature, it is made from lightweight material with the magnet wire wound around it. They are designed for rapid acceleration.
DCC and Coreless Motors
Locomotives with coreless motors should not be used on a DCC system without a multifunction decoder installed. They will overheat when operated in zero stretching modes. This is due in part to their low impedance, which makes them look almost like a short circuit. This will allow a lot of current to flow during zero stretching. The excessive current flow will result very quickly in the destruction of the motor.
High Frequency Decoders
Coreless motors should be used only with High Frequency Multifunction Decoders. Some manufacturers recommend a PWM frequency greater than 20kHz. This increases the motor’s impedance when driven by a multifunction decoder’s motor drive circuits. Not all manufacturers will publish the PWM frequency in their literature.
Why Use a Coreless Motor?
The coreless or Moving Coil motor has been around since the 1930s. Advances in manufacturing made them practical and cost effective in the 1960s.
Construction
The construction of a coreless DC motor eliminates the laminated iron core of the rotor. Instead, the rotor windings are wound in a skewed, or honeycomb (known as the Faulhaber winding) fashion, forming a self-supporting hollow cylinder or basket. Because there is no iron core to support the windings, they are often held together with epoxy. The stator is made of a rare earth magnet, and sits inside the basket. All of the core produces torque and smooths operation. The design also produces high acceleration rates.
Advantages
Disadvantages
Low Inductance
Eliminating the iron core of the rotor, while reducing mass, also reduces the inductance, and the resulting impedance of the winding. A typical iron armature motor may have an inductance of 1mH or more.
A typical 12V coreless motor may have a specification of >200μH of inductance. At DCC frequencies the impedance would be about 10Ω. Which would allow a current of almost 1.5A to flow, for a motor with a rated start current of 200mA.
When the impedance is calculated for a given motor, the starting current can easily be exceeded when the DCC track voltage is applied to the motor. For this reason, a coreless motor should never be used without a multifunction decoder on a layout with a DCC System. Modern multifunction DCC decoders are capable of powering a coreless motor.
See the Wikipedia Article for more info: Coreless Motor
coreless motor
1 coreless
2 motor
мотор, находящийся внутри судна motor автомобиль
везти на автомобиле
анат. двигательный мускул;
двигательный нерв
ехать на автомобиле
моторная лодка (тж. motor boat)
автомобильный;
motor show выставка автомобилей
3 motor vehicle
4 motor-car
2) амер. моторный вагон motor-car легковой автомобиль
амер. моторный вагон
5 motor-cyclist
6 motor-driven
7 motor-generator
8 motor-operated
9 DMV Department of Motor Vehicles
10 motor
11 motor boat
12 motor bus
13 motor cycle
14 motor ship
15 motor show
16 motor-car
17 motor-cyclist
18 servo-motor
19 linearinduction motor
20 motor
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