Cascade speed regulation method

Cascade speed regulation refers to the motor rotor winding circuit in series motor vehicle spare partswith adjustable additional potential to change the slip of the motor,to achieve the purpose of speed control.Most of the slip power is absorbed by series of additional potential to recycle produce additional device,the absorption of 12 volt electric motor returning the slip power grid or conversion of energy use.According to the slip power utilization way,cascade speed regulation can be divided wholesalemotor.blogspot.com into motor cascade speed regulation,mechanical cascade speed regulation and thyristor cascade speed regulation form,adopts thyristor cascade speed regulation electrical motor Its characteristic is: to speed the slip loss in the process of feedback to the grid or production machinery,high efficiency;Installed capacity is proportional to the speed range,the investment province,apply to speed range in production machinery from 70% to 90% of the rated speed;Speed regulating device failure can switch to run at full speed,avoid production;Thyristor cascade speed regulating power factor is low,the influence on harmonic.This method is suitable for the fan,water pump and the rolling mill,mine hoist,the extrusion machine use.

Wound rotor asynchronous motor rotor series resistance speed control method

Wound rotor asynchronous motor rotor string into the additional resistance,make the slip of the

motor,motor under low single phase asynchronous motor speed running.The series resistance,the greater the lower the speed of 5kw permanent magnet generator the electric motors price motor.This method is simple,easy to control,but the slip power consumption in acmotortrading.blogspot.com the form of heat on the resistance.Step speed,mechanical properties of soft.

Motor starting before the examination

New or stop using the motor for a long time, before the use should check between the winding and winding insulation resistance to ground. Usually below 500 v for the motor insulation resistance meter with 500 v; The 500-1000 with 1000 v v motor insulation resistance meter; diesel generators prices Of more than 1000 v motor insulation resistance meter with 2500 v. Insulation resistance shall not be less than 1 m Ω work every kv voltage, and measured motor part in the condition of motor cooling. (2) check whether there is any crack www.dongfeng-motor.com on motor appearance, all fastening screws and parts are complete, the thinking of fixed situation are in good condition. (3) check the motor drive mechanism work is reliable. As shown in (4) according to the nameplate data, such as voltage, power, frequency, coupling, rotating speed and power supply, if load is consistent. (5) monitor the ventilation of the motor and bearing lubrication situation is normal. (6) turn the motor shaft, check that the rotor can free rotation, the rotation has no noise. (7) to check the motor brush and brush lifting mechanism is flexible assembly, for the location of the brush handle is correct. (8) check reliable electrical grounding device.

Hot summer, the motor running problems should be paid attention to

In the operation of the motor in the hot summer work should pay attention to the following: 1, monitoring the power supply voltage change in voltage should not be more than or less than 10% of the rated voltage range, if lower than this range, should be appropriately reduced load operation. At the same time, the three-phase voltage imbalance also cannot too much. The difference of any two phase voltage should not exceed 5%, otherwise will make motor fever too fast. Motor power are best a voltmeter and switch directly to monitor. 2, monitors the running motor current Under normal circumstances operation shall not exceed the nameplate rating. Also should pay attention to whether the three phase current balance and any two interphase current difference should not be more than 10% of the rated current, otherwise the motor has a fault. Particular attention to whether there is a lack of phase operation. Shall furnish ammeter monitoring of large capacity motor running current, capacity should also be smaller motor line current is measured with a clip-on ammeter at any time. 3, monitoring the temperature of the motor The temperature rise shall not exceed allow the limits of the motor nameplate. In operation of the motor temperature rise is monitoring the motor running condition of direct and reliable way. Check the temperature rise method can refer to the 144 q. Online road furnish voltmeter, ammeter, and overload protection device, also is Motor vehicle the main way to monitor the temperature rise. 4, monitor the motor running in induction motor price the noise, vibration and smell when the motor running, voice even, smooth operation, insulating paint smell and the smell. In case of abnormal noise, vibration, insulating paint smell, etc., that motor overheating or other failures. 5, surveillance gear work To watch if there's any loose for pulley or coupling, transmission belt with and without sliding phenomenon (sliding belt is too loose), belt joint are in good condition. 6, monitor the condition of the bearing Pay attention to the bearing noise and fever. When using a thermometer to measure, rolling bearing heating temperature not over 95 ℃, sliding bearing heating temperature not over 80 ℃. Bearing abnormal sound or overheating, is poor lubrication bearing, wear and tear caused by severe. 7, monitor the condition of the fuse Should always pay attention to whether there is a photograph of blown fuse, lest cause lack of phase operation make the motor overheating. In a word, the motor in the process of running, monitoring the current, the change of temperature, found problems in a timely manner.

Vigorously promote application of high efficiency and energy saving motor electrical engineer

In order to improve the energy efficiency, energy conservation and emissions reduction goals, general electrical engineer is an important way promoting application in high efficiency and energy saving motor, this method is especially applicable to the need to run a long time and high load situations, such as steel, oil field, textile, chemical industry, etc., these motor used in the industry are often need to run 24 hours a day uninterrupted, if use the high efficiency and energy saving motor, energy-saving effect is very significant. This not only can save power to reduce production cost, has the good economic efficiency, at the same time also can reduce www.facebook.com/dongfeng.motor carbon emissions, produce good social benefits. Therefore, in terms of energy conservation and environmental protection, high efficiency, the development of highly efficient motor work is an urgent task. In the course of the development of efficient and highly efficient motor, an important task is to take to be able to gauge the wastage of the nonlinear and complex structure and various influencing factors of calculation method, the different structural parameters of stator rotor, material properties, and other motor part factors affecting the specific impact of motor loss, and various losses in the motor on the basis of system analysis, to improve the structure of the motor design, finally it is concluded that the best design plan, achieve the goal of consumption. , therefore, a detailed analysis on characteristics of the motor loss is the first task of super-efficient asynchronous motor research work, in order to achieve this goal, based on modern computer technology is a new loss calculation method for motor loss system analysis, from the microscopic view on how to develop the energy saving scheme has theoretical guidance meaning. In addition, in the process of asynchronous motor the development of highly efficient motor, accurate testing of the motor loss is also very important. For a long time, the motor structure and influence factors of additional loss is relatively complex, test is relatively difficult, previous treatment is using 0.5% of the input power to replace, and the proportion in the actual test does not reflect its true value loss, this will lead to some is not actually achieve efficient motor was judged to be efficient, make the motor efficiency defined error is produced. In IEC latest standards, clear recommendations according to the 112 b method to measure the additional loss, and the whole test process, accurate test and separation of the motor racing iron loss is a key link, but because of the influence factors of no-load iron loss is various, therefore, how to realize the accurate asynchronous motor racing iron loss test, test of super efficient motor loss and efficiency determine is of great significance.