Capacitors. So many different types and technologies… but why? What’s unique about them? This blog post attempt to answer those questions about one of the most common capacitor technologies: the aluminum electrolytic capacitor.
The aluminum electrolytic capacitor is a passive component that has traditionally been used for filtering, timing networks, by-pass, coupling and other applications requiring a cost effective, volumetrically efficient and highly reliable component.
An aluminum electrolytic capacitor consists of an anode foil, a cathode foil and separator paper which are wound together and impregnated with an electrolyte. The anode foil has an aluminum oxide layer acting as the dielectric. After the thin aluminum foil (65 to 100 microns) is electrochemically etched to increase the plate’s surface area, the dielectric is produced by anodic oxidation on its surface. The cathode foil, in general, utilizes no oxidation process.
Note that due to the physical design elements and construction, not only does a capacitor have capacitance, but it also has a series resistance and inductance as well as a parallel resistance allowing the flow of current.
The capacitance of aluminum electrolytic capacitors (in microfarads) is expressed by the following equation:
C = 8.855 x 10e-6 x (ES/d)
E = Dielectric constant
S = Surface area of dielectric (cm2)
d = Thickness of the dielectric (cm)
Large capacitance can be obtained when:
- the dielectric constant is high
- the surface area is large
- the dielectric is thin
In aluminum electrolytic capacitors the dielectric constant is only 8 to 10, but the aluminum oxide dielectric layer is extremely thin (about 15 Angstroms per volt). High gain foil produced by the electrochemical etching creates a surface magnification, or gain, as much as 100 times for low voltage foil and 20 to 25 times for high voltage foil. Therefore (and this is a critical benefit of these capacitors):
An aluminum electrolytic capacitor can provide a large capacitance compared to other types of capacitors of the same volume
Nippon Chemi-Con – the parent company of United Chemi-Con – is the world’s largest manufacturer of aluminum electrolytic capacitors. NCC pioneered the development of raw material processing techniques and highly automated production systems. The product improvements of these innovations have dramatically improved circuit design flexibility and led to many new applications for aluminum electrolytic capacitors.
To learn more about aluminum electrolytic capacitors please Contact Cover 2 Sales.
Looking for a DC motor drive? Look no further! ElectroCraft’s DC motor drives are designed for high performance and are ideal when precise speed and position control are required.
ElectroCraft’s Universal Drives utilize state-of-the-art digital-drive technology and an intuitive and highly configurable user interface to take performance, efficiency and flexibility to the next level. These drives are ideal for all DC motor types, including stepper, permanent magnet DC and brushless DC motors, making them perfect for a wide range of industrial, commercial market, and consumer product applications. ElectroCraft offers three standard capacities and customized versions are available.
The PRO Series of programmable drives from ElectroCraft are full programmable motion controllers with unprecedented flexibility in a compact footprint. They are capable of powering permanent magnetic DC, brushless and stepper motors (open and closed loop).
For a further introduction on these motor drives, please watch the following video:
For more information about ElectroCraft motors and motor drives, please contact Cover 2 Sales.
Medical equipment is one of the most rapidly evolving vertical markets in the electronics industry. Equipment is being made smarter, more-capable and smaller. Interestingly, one of the primary complaints with medical equipment is a very low-tech one: Audible noise. Equipment that has to drive a motor, a pump or any mechanical device requires a fair amount of power. And larger power supplies require cooling fans. Fans are the chief culprit of this noise. The market is demanding highly efficient medical power supplies with a smaller form factor, maximum output flexibility and low audible noise.
TDK Lambda has addressed these needs with their new “QM” (Quiet Modular) series of configurable AC/DC power supplies. Utilizing low speed, low audible noise fans, these devices are much quieter than any other solution on the market today.
The QM series of supports up to 18 outputs and total power levels to 1500W, allowing customers to configure exactly the power solution they need. In addition, these supplies come with medical isolation (MoPP) and safety certifications (IEC 60601-1, IEC 60950-1, and IEC 61010-1), making them ideal for medical, test, communications and broadcast equipment. Other features include:
- PMBus™ support
- Global ON/OFF
- Remote ON/OFF
- Remove sense
- -20C to +70C operating temperature
- Seven (7) year warranty
If you’d like more information on the QM series – or if you have a power supply requirement you’d like to discuss, please contact Cover 2 Sales
ElectroCraft is a global manufacturer of off-the-shelf and engineered fractional-horsepower motors and motion products. ElectroCraft provides a wide range of standard products and many are available with configurable options. In addition, ElectroCraft is known for their ability to provide customized motion solutions to meet OEMs’ precise performance, cost and quality requirements.
ElectroCraft’s solutions can be found in a variety of applications, including:
Precision control of weaponry, radars and surveillance equipment, and unmanned vehicles have helped to enable a military that is second-to-none. And ultimately, more safe for combat personnel. ElectroCraft’s solutions offer the precision and reliability these applications require.
Aircraft, trains, marine vessels and motor vehicles all utilize motors for on-board functions. Powertrain and emissions controls, door and HVAC controls, in-cabin controls, marine stabilizers, camera systems are just a few of the many applications. ElectroCraft’s motion solutions are chosen because of this market’s needs for performance, precision, reliability and custom solutions.
Robotics is one of the fastest growing markets today with products spanning the commercial/consumer, industrial, medical and military segments. From traction and steering systems to joint positioning and electric gripper control, ElectroCraft offers a variety of customized motors, drives, gearing and mechanical actuator solutions to satisfy most system requirements.
Mobility solutions, surgical robots, lab automation and analysis equipment; these are just a few of the potential applications for motion control products within the medical arena. In the medical office, compact size, precision, efficiency, and quiet operation are all critical needs. ElectroCraft’s high-torque density brushless motors, compact gear motors and precision drives are ideal for these applications. In the laboratory robotic arms, rotary tables, fluid pumps, centrifuges and dispensing systems need precise motorized positioning and speed control. ElectroCraft’s steppers, DC motors, gear motors, actuators and high-performance drive products provide the capability these systems require.
If you have a motion control requirement, please contact Cover 2 Sales to discuss it with us!
Cover 2 Sales is pleased to announce we have been chosen to represent Sensitron Semiconductor for Maryland, Virginia and Washington DC. Sensitron is a leading manufacturer of high reliability power electronic component solutions for the military, aerospace, space, medical and other mission critical markets. Sensitron’s solutions are synergistic with several other technologies on Cover 2 Sales’ line card, including power supplies, power converters, power capacitors, portable power (batteries), filtering and thermal management solutions.
For more information about Sensitron’s power components, or to discuss requirements you have for power conversion solutions, please contact Cover 2 Sales.