CFR motor Germany CFR model CFR price

The CFR motor has a set of adjustable eccentric weights installed at each end of the rotor shaft, utilizing the centrifugal force generated by the high-speed rotation of the shaft and eccentric weights to obtain excitation force. Vibration motors have a wide vibration frequency range; only when the excitation force and power are properly matched can mechanical noise be reduced. Vibration motors have six classifications, such as by starting and operating mode, and by operating speed.

CFR motor structure

The motor is divided into two parts: stator and rotor. Note: Do not confuse commutating poles with commutators. The stator includes: main magnetic poles, frame, commutating poles, brush gear, etc. The rotor includes: armature core, armature (shu) winding, commutator, shaft, and fan, etc. The rotor part of a DC motor consists of the armature core, armature, commutator, and other devices. The components of the construction are described in detail below. 1. Armature core part: Its function is to house the armature winding and conduct magnetic flux, in order to reduce eddy current loss and hysteresis loss in the armature core during motor operation. 2. Armature part: Its function is to generate electromagnetic torque and induced electromotive force for energy conversion. The armature winding consists of many coils or glass-fiber-covered flat copper wires or high-strength enamel-coated wires. 3. The commutator, also known as the rectifier, in a DC motor, converts the DC current from the brushes into AC current within the armature winding, keeping the direction of electromagnetic torque stable. In a DC generator, it converts the AC electromotive force in the armature winding into DC electromotive force output at the brush terminals. The commutator consists of a cylinder made of many segments insulated from each other by mica. Each end of every coil in the armature winding is connected to two commutator segments. In a DC generator, the function of the commutator is to convert the alternating electromotive force in the armature winding into DC electromotive force between the brushes, allowing current to flow through the load. The DC generator outputs electrical power to the load, while current also flows through the armature coils. It interacts with the magnetic field to generate electromagnetic torque, the direction of which is opposite to that of the generator. The prime mover must overcome this magnetic torque to drive the armature rotation. Therefore, while the generator outputs electrical power to the load, it receives mechanical power from the prime mover, achieving the conversion of mechanical energy into electrical energy by the DC generator.

CFR motor advantages

The motor can be integrally mounted on the wheel axle, forming an integrated direct drive system, where one wheel axle is one drive unit, eliminating the need for a gearbox. Advantages of permanent magnet synchronous motors: High power efficiency and high power factor of the permanent magnet synchronous motor itself; low heat generation, resulting in a simple motor cooling system structure, small volume, and low noise; the system adopts a fully enclosed structure, with no transmission gear wear, no transmission gear noise, lubrication-free, and maintenance-free; large allowable overload current for permanent magnet synchronous motors, significantly improving reliability; the entire transmission system is lightweight, and the unsprung weight is lighter than traditional wheel axle transmissions, with high power per unit weight; due to the absence of a gearbox, the bogie system can be designed freely, such as flexible bogies and single-axle bogies, greatly improving train dynamic performance. Due to the use of permanent magnet material poles, especially rare earth metal permanent magnets (such as NdFeB), which have high magnetic energy product, higher air gap magnetic flux density can be obtained. Therefore, at the same capacity, the motor has a small volume and light weight. The rotor has no copper loss and iron loss, nor friction loss from slip rings and brushes, resulting in high operating efficiency. Small moment of inertia, large allowable pulse torque, high acceleration, good dynamic performance, compact structure, and reliable operation.

CFR motor mechanical characteristics

Motor features: small moment of inertia, low starting voltage, low no-load current; abandoning the contact commutation system greatly increases motor speed, with a maximum speed of up to 100 000rpm; brushless servo motors can achieve control of speed, position, torque, etc., without encoders during servo control; there is no brush wear, and in addition to high speed, it also features long life, low noise, and no electromagnetic interference. Features of DC brushed servo motors: 1. Small volume, fast action and response, large overload capacity, wide speed regulation range. 2. Large low-speed torque, small fluctuation, smooth operation. 3. Low noise, high efficiency, 4. Rear encoder feedback (optional) constitutes advantages of DC servo, etc., 5. Wide voltage transformation range, adjustable frequency. DC servo motors can be applied in spark erosion machines, manipulators, precision machines, etc. They can be configured with 2500P/R high-resolution standard encoders and tachometers, and can be additionally equipped with gearboxes, bringing reliable accuracy and high torque to mechanical equipment. Good speed regulation, highest output power per unit weight and volume, greater than AC motors, and far exceeding stepper motors. Multi-stage structure has small torque fluctuation. Servo motors are used in closed loops. That is, they constantly send signals to the system and correct their operation based on signals from the system. Servo motors can also be controlled by microcontrollers.

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