PCB mount SMT motor Vibration Motor

smt vibration motor

SMT reflow motor

Application: wearable bracelet

dimention	11*4.4*3.6
voltage	2.7V
speed	14000±2500rpm
current	65±10mA
vibration	0.35G
feedbak time	约40mS
lifetime	2.7V，on 2.5S off 2.5S，30 circle

What are coreless DC motors?

                                                                                              BY DANIELLE COLLINS 

A typical brushed DC motor consists of an outer stator, typically made of either a permanent magnet or electromagnetic windings, and an inner rotor made of iron laminations with coil windings. A segmented commutator and brushes control the sequence in which the rotor windings are energized, to produce continuous rotation.

A typical DC motor consists of an outer, permanent magnet stator and an inner rotor made of iron laminations with windings.

Coreless DC motors do away with the laminated iron core in the rotor. Instead, the rotor windings are wound in a skewed, or honeycomb, fashion to form 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 magnets, such as Neodymium, AlNiCo (aluminum-nickel-cobalt), or SmCo (samarium-cobalt), and sits inside the coreless rotor.

A coreless DC motor does away with the iron core in the rotor. Instead, the rotor windings are wound in a skewed, or honeycomb fashion to form a self-supporting hollow cylinder. The stator magnet sits inside the coreless rotor

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Other terms for coreless DC motors include “air core,” “slotless,” and “ironless.” 

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The brushes used in coreless DC motors can be made of precious metal or graphite. Precious metal brushes (silver, gold, platinum, or palladium) are paired with precious metal commutators. This design has low contact resistance and is often used in low-current applications. When sintered metal graphite brushes are used, the commutator is made of copper. The copper-graphite combination is more suitable for applications requiring higher power and higher current.

vibrationmotor.net: coil 

       Coreless DC motors have a rotor that        is hollow and self-supporting, which reduces mass and inertia.

The construction of coreless DC motors provides several advantages over traditional, iron core DC motors. First, the elimination of iron significantly reduces the mass and inertia of the rotor, so very rapid acceleration and deceleration rates are possible. And no iron also means no iron losses, giving coreless designs significantly higher efficiencies (up to 90 percent) than traditional DC motors. The coreless design also reduces winding inductance, so sparking between the brushes and commutator is reduced, increasing motor life and reducing electromagnetic interference (EMI).

Motor cogging, which is an issue in traditional DC motors due to the magnetic interaction of the permanent magnets and the iron laminations, is also eliminated, since there are no laminations in the ironless design. And in turn, torque ripple is extremely low, which provides very smooth motor rotation with minimal vibration and noise.

Because these motors are often used for highly dynamic movements (high acceleration and deceleration), the coils in the rotor must be able to withstand high torque and dissipate significant heat generated by peak currents. Because there’s no iron core to act as a heat sink, the motor housing often contains ports to facilitate forced air cooling.

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DC motor

Coreless DC motors are available in both cylindrical and flat (disc) configurations.

The compact design of coreless DC motors lends itself to applications that require a high power-to-size ratio, with motor sizes typically in the range of 6 mm to 75 mm (although sizes down to 1 mm are available) and power ratings of generally 250 W or less. Coreless designs are an especially good solution for battery-powered devices because they draw extremely low current at no-load conditions.

Coreless DC motors are used extensively in medical applications, including prosthetics, small pumps (such as insulin pumps), laboratory equipment, and X-ray machines. Their ability to handle fast, dynamic moves also makes them ideal for use in robotic applications.

Thanks for your attention.

With love

By ji fei holding limited

www.vibrationmotor.net
www.coin-motor.com

Specialist for Coreless DC motor

Principle of Mini Vibration Motor

Principle of Mini Vibration Motor

After the DC current passes through the brush, current flows into the coil through the sliding contact between the brush and the commutator segments. 

The energized coils of different Rao groups cut the magnetic lines of force in the permanent magnetic field formed by the stator magnets, thereby generating electromagnetic force. 

The torque generated by this electromagnetic force causes the rotor to rotate, and the current commutation of the brush causes this process to cycle to achieve permanent motion of the rotor. 

The rotor drives the eccentric rotor of the mass to rotate, and the vibration motor has the effect of vibration. The vibration of the motor is mainly achieved by the eccentric vibrator.


With love 
by www.vibrationmotor.net