SMALL DC MOTOR
A brushed DC motor from Portescap is ideal for portable and small devices. Brush DC motor technology offers the distinct advantages of low friction, low starting voltages, absence of iron losses, high efficiency, good thermal dissipation and linear torque-speed function. These ultra-compact small DC motors are designed to deliver superb speed-to-torque performance with lower joule heating. We also offer a variety of gearheads and encoders. Portescap small DC motors can deliver a torque range from 0.36 mNm up to 160 mNm continuously and from 2.5 mNm up to 1,487 mNm in intermittent operation.Our brushed DC motors are designed for quick and easy modification, so you can get exactly what you need with the pricing and delivery you expect from an off-the shelf solution. We can customize standard brush motor features to meet specific application requests, including performance specifications, mounting configuration, thermal and ambient condition requirements, and other operational needs.
Leader’s small brush DC motors are ideal for your portable and small devices. Our continuous innovation in coreless motor technology enables us to offer:
Frame sizes from 8 to 35 mm
Speeds from 5,000 to 14,000 rpm
Continuous motor torque – 0.36 to 160 mNm
Coreless rotor design
Low rotor inertia
REE coil
High power to weight ratio
Neodymium magnet available in some brush DC motor models
Sleeve and ball bearing versions
High motion efficiency, that allows you to build a more compact, precise and energy-efficient solution
How to Select Your Brush DC Motor？
Selection Criteria
Motor diameter
Sizing a brush DC motor to a specific application begins with matching the motor’s diameter to the available space. In general, larger frame size motors deliver more torque. Motor diameter ranges from 8 mm to 35 mm.
Length
Various lengths are available, ranging from 16.6 mm to 67.2 mm, to best fit the application package requirements.
Commutation type
Precious metal brushes are well adapted to low current density applications, providing low friction and high efficiency, whereas high continuous or peak current applications will require graphite-copper brushes.
Bearing type
Several bearing combinations have been designed, from simple sleeve bearing construction to preloaded ball bearings systems for high axial or radial load applications.
Magnet and commutation type
Adapt your motor selection to the power and current needs of your application: NdFeB magnets provide higher output torque than Alnico, at a higher cost. The commutation system (type and size of the commutators) is also reflected in this coding.
Winding
Various winding options are proposed to best match with the application requirements – voltage, resistance and torque constant are the basic parameters for selection.
Execution code
Used to specify standard and customizations.
Selection Criteria
Motor diameter
Sizing a brush DC motor to a specific application begins with matching the motor’s diameter to the available space. In general, larger frame size motors deliver more torque. Motor diameter ranges from 8 mm to 35 mm.
Length
Various lengths are available, ranging from 16.6 mm to 67.2 mm, to best fit the application package requirements.
Commutation type
Precious metal brushes are well adapted to low current density applications, providing low friction and high efficiency, whereas high continuous or peak current applications will require graphite-copper brushes.
Bearing type
Several bearing combinations have been designed, from simple sleeve bearing construction to preloaded ball bearings systems for high axial or radial load applications.
Magnet and commutation type
Adapt your motor selection to the power and current needs of your application: NdFeB magnets provide higher output torque than Alnico, at a higher cost. The commutation system (type and size of the commutators) is also reflected in this coding.
Winding
Various winding options are proposed to best match with the application requirements – voltage, resistance and torque constant are the basic parameters for selection.
Execution code
Used to specify standard and customizations.
Workings of a Brush DC Motor
BRUSH DC MOTOR BASICS
Leader’s brush DC technology originates from a design based on an ironless rotor (self-supporting coil) combined with a precious metal or carbon copper commutation system and a rare earth or Alnico magnet. It offers distinct advantages for high-performance drive and servo systems: low friction, low starting voltage, absence of iron losses, high efficiency, good thermal dissipation, linear torque-speed function. All these factors facilitate use and simplify the servo loop. For incremental motion systems where the low rotor inertia allows for exceptional acceleration, and for all battery-powered equipment where efficiency is a major concern, brush DC motors offer optimum solutions.
All DC motors are composed of three main sub-assemblies:
the stator
the brush holder end cap
the rotor
1. Stator – The stator consists of the central and cylindrical two-pole permanent magnet, the core that supports the bearings, and the steel tube that closes the magnetic circuit. High-quality rare earth magnets ensure outstanding performance in a small envelope. Sintered bearings and ball bearings are available depending on your application loads and requirements.
2. Brush holder endcap – The brush holder endcap is made of a plastic material. Depending on the intended use of the motor, the brush could be of two different types; carbon or multi-wire. Carbon types use copper graphite or silver graphite and perfectly suit incremental motion applications where high continuous and peak torque are required. Multi-wire type uses precious metal and will guarantee low starting voltage and improved efficiency, a perfect match for portable battery-powered applications. Portescap’s engineer can design endcaps that reduce electromagnetic noise to meet EMC requirements.
3. Rotor – The rotor is the heart of Portescap’s DC motor. The coil is directly and continuously wound onto a cylindrical support that is later removed, eliminating excessive air gaps and inactive coil heads that bring no contribution to the torque creation. The self-supporting coil does not require an iron structure and therefore offers low moment of inertia and no cogging (the rotor will stop in any position). Unlike other conventional DC coil technologies, due to the absence of iron there are no hysteresis, eddy current losses or magnetic saturation. The motor has a perfectly linear speed-torque behavior and the running speed depends only on supply voltage and load torque. Portescap, through its proprietary know-how, has developed multiple automated winding machines for different frame sizes and continues to innovate on the winding method to increase power output.
The brushes/collectors combination is optimized to withstand a long operational lifetime at up to 12,000 rpm and provide high reliability. Portescap DC products can deliver a torque range from 0.6 mNm up to 150 mNm continuously and from 2.5 mNm up to 600 mNm in intermittent operation.
Established in 2007, Leader Microelectronics (Huizhou) Co., Ltd. is an international enterprise integrating R & D, production and sales. We mainly produce flat motor, linear motor, brushless motor, coreless motor, SMD motor, Air-modeling motor, deceleration motor and so on, as well as micro motor in multi-field application.
Contact us for a quotation for production quantities, customizations and integration.
Phone:+86-15626780251 E-mail:leader01@leader-cn.cn
Post time: Jan-11-2019
