A DC motor is any of a class of rotary electrical
machines that converts direct current electrical energy into mechanical energy.
The most common types rely on the forces produced by magnetic fields. Nearly
all types of DC motors have some internal mechanism, either electromechanical
or electronic, to periodically change the direction of current flow in part of
the motor.
DC motors were the first type widely used, since they
could be powered from existing direct-current lighting power distribution
systems. A DC motor's speed can be controlled over a wide range, using either a
variable supply voltage or by changing the strength of current in its field
windings. Small DC motors are used in tools, toys, and appliances. The
universal motor can operate on direct current but is a lightweight motor used
for portable power tools and appliances. Larger DC motors are used in
propulsion of electric vehicles, elevator and hoists, or in drives for steel
rolling mills.
Dc motor areas of application: smart home field, robotics, precision medical equipment industry, automotive drive field, electronic products and personal care equipment
Application of the product:
Features: high torque, low noise, small volume, light weight, easy to use, running
constant speed, etc., can also be matched with various gearboxes to change the
output speed and torque.
Features: small volume, fast speed, stable performance, low price, good speed regulation.
Method
of use: the best stable in horizontal plane, installed on the dc motor output
shaft parts, cannot use a hammer to knock, knock prone to press into the dc
motor drive, may cause damage to internal components, and cannot be used in the
case of blocked.
Operating temperature range:
DC motor should be used at a temperature of -10~60℃.
The figures stated in the catalog specifications are based on use at
ordinary room temperature catalog specifications re based on use at
ordinary room temperature
(approximately20~25℃.
If a geared motor is used outside the prescribed temperature range,the
grease on the gearhead area will become unable to function normally and the
motor will become unable to start.Depending on the temperature conditions ,it
may be possible to deal with them by changing the grease of the motor's parts.Please feel free to consult
with us about this.
Storage temperature range:
DC motor should be stored ta a temperature of -15~65℃.
In case of storage outside this range,the grease on the gearhead area
will become unable to function normally and the motor will become unable to
start.
Service life:
â—Use with a
load that exceeds the rated torque
â—Frequent
starting
â—Momentary
reversals of turning direction
â—Impact
loads
â—Long-term
continuous operation
â—Forced
turning using the output shaft
â—Use in
which the permitted overhang load or the permitted thrust load is exceeded
â—A pulse
drive ,e.g.,a short break,counter electromotive force,PWM control
â—Use of a
voltage that is nonstandard as regards the rated voltage
â—Use
outside the prescribed temperature or relative-humidity range,or in a special
environment.
â—Please
consult with us about these or any other conditions of use that may apply,so
that we can be sure that you select the most appropriate model.
when it come to volume production,we're a
major player as well .each month,we rurn out
600000 units,all of which are compliant with the rohs directive.Have any
questions or special needed, please contact us, we have the engineer group and
best sales department to service to you Looking forward to your inquiry. Welcome to
our factory.
Dc Motor,Small Dc Motor,Mini Dc Motor,Robot Dc Motor,Dc Motor With Gearbox Shenzhen Shunchang Motor Co., LTD. , https://www.scgearmotor.com
Third, the procurement project overview:
1. Nature of procurement project:
This project is a digital campus construction project of the 8th Middle School of Kunming City. The procurement method is open tendering. Source of funds: For financial allocation, interested suppliers are invited to conduct sealed bidding, and will be formed into a bid evaluation committee in accordance with the relevant provisions of the “Government Procurement Law of the People’s Republic of Chinaâ€, and the winning bidder will be responsible for the procurement of equipment for this project. And installation and construction.
2, the scope of procurement: integrated wiring subsystem; network center subsystem; software; multimedia teaching subsystem; computer classroom subsystem; campus broadcast subsystem; safe campus subsystem; card subsystem; LED display system.
3. This project has four tenders.
A standard segment: integrated wiring subsystem, including two subsystems of data and voice;
Network center subsystem, including central computer room decoration, switches, servers, etc.;
Software, including online version of anti-virus, database and campus management platform;
The second bidding section: multimedia teaching subsystem, including 72 multimedia classrooms, 2 automatic recording rooms, 1 lecture hall, 1 conference room, etc.
Three-segment section: computer classroom subsystem, including 4 new buildings and 2 relocations.
Four-segment segment: campus broadcast subsystem, including indoor and outdoor parts;
Pingan campus subsystem, including video surveillance and infrared alarm;
All-in-one subsystem, without server;
LED display system, including a 50 square meter color screen and 8 square meters of monochrome screen.
5. The project and product quality requirements are in line with the intelligent building design standard GB/T 50314-2006, the integrated wiring system engineering design specification GB 50311-2007, the integrated wiring system engineering acceptance specification GB50312-2007, the electronic computer field general specification GB/T 2887- 2000, etc., as well as the relevant national mandatory standards.
6. Project location: New Campus of the 8th Middle School of Kunming City, next to the Hetang Moonlight Community of Longquan Road, Beicheng District.
4. Bidding qualifications and qualification requirements:
The bidding qualification requirements for a bidding section: having the qualification of an independent legal person; the computer information system integration level issued by the construction administrative department in charge of the building intelligent engineering professional contracting level and above or the Ministry of Industry and Information Technology (Office) The above qualifications.
Bidding requirements for bidding for the second and third bidding sections: having the status of an independent legal person; the business scope of the business license shall include the content related to the procurement project; and the ability to complete the implementation of this bidding section.
The bidding qualification requirements for the four-segment bidding: have the qualification of independent legal person; have the qualification of the building intelligent engineering professional contracting enterprise issued by the construction administrative department at the third level or above (including the third level); the safety technology prevention industry issued by the Yunnan Provincial Security Association Credit card (If the bidders of this bidding section have the above qualifications at different times, they can form a consortium bid, but no more than two members of the consortium).
Bidders may bid on the above four tenders at the same time, or they may only bid on any of the tenders.
5. Any unit that has the required qualifications and qualifications may submit a bid application to the purchaser for the above procurement project.
6. The bidder shall inquire and obtain the bidding documents from Kunming Chenxi Tendering Co., Ltd. (7th Floor, Building B, Jianye Business Center, No. 47 Dongfeng East Road, Kunming). The registration period is from June 19, 2009 to July 8, 2009. At 17:30 on the day of the registration, a copy of the legal person's business license (original), a copy of the qualification certificate (original), the unit's letter of introduction or the original letter of proxy of the legal representative and the identity card signed by the letter of introduction will be held. The tendering agency shall have a duty on both weekends to accept the registration.
7. The price of each set of bidding documents is 400 yuan (RMB), and will not be refunded after sale. If you need a mail order, you can notify the bidding agency in writing, and add a postage fee of RMB 100 (RMB) per set. The bidding agency will send the bidding documents to the bidder by express delivery within 1 day after receiving the mail purchase payment.
8. The deadline for submission of bid documents and the time for bid opening is 9:00 am on July 9, 2009. The location is Kunming Chenxi Tendering Co., Ltd. (7th Floor, Building B, Jianye Business Center, No. 47 Dongfeng East Road, Kunming) .
9. If the bid documents are delivered late or not delivered to the designated place, the purchaser will not accept the bid.
Purchasing: Kunming Wuhua District Education Bureau Purchasing Agency: Kunming Chenxi Tendering Co., Ltd. Company Name: Kunming Chenxi Tendering Co., Ltd. Contact: Liu Jingjing, Wang Tingting Tel: 0871-3114082, 3114055-811, 807, 13908866382, 13577 E-mail: Fax: 0871-3145686 Postal Code: 650041 Address: 7/F, Building B, Jianye Business Center, 47 Dongfeng East Road, Kunming 
LED display system and other public bidding procurement announcements
Title: LED Display System, etc. Public bidding and procurement announcement Tender No.: Kunchen Yu Cai [2009]-06-306 to 309 Announcement Date: July 8, 2009 Deadline: July 9, 2009 Tendering Agency: Kunming City, Wuhua District Education Bureau, Province: Yunnan Province - Kunming City Content: First, the name of the purchaser: Kunming Wuhua District Education Bureau Second, the procurement project name: Kunming City, the eighth middle school digital campus construction project.