Three-phase ac brake and the advantages and disadvantages with rectifier dc brake: With rectifier dc brake is currently the most widely used electromagnetic braking motor brake. But as with rectifier dc brake rectifier are easy to burn, the on and off so the reliability is bad. And because the cause of the brake of the rectifier is opening and brake speed is slow, brake motor brake and startup can not meet the equipment requirements, external connection to other equipment requirements. Three-phase ac electromagnetic brake because without ballast devices, the communication is produced by the alternating magnetic field so open speed, solved the lower reliability of dc brake rectifier device, brake open speed slow, brake faults frequently. Serve to connect YEJ electromagnetic brake series three-phase asynchronous motor in reducer industry using the said method and selection of key points: In the reducer industry brake motor, code-named BMG. There are two kinds of manual release of HF ac induction motor - manual release with self-locking function, HR - hand release without self-locking function, did not indicate the general dynamic release does not require the opponents. Because of the speed reducer used in all walks of life, for the distribution of electromagnetic brake motors have different requirements, such as brake voltage, the brake braking time, brake and brake noise and motor can frequently brake. Brake voltage to select as the voltage of the motor, general YEJ100 stand and the following motor using single 220 v brake; Brake motors YEJ100 stand above two 380 v brake. Have special requirements in the specified voltage.
Brake the braking time: the use of different occasions have different request for the brake braking time, such as rapid braking crane hoisting equipment requirements, and ask for a slow braking crane traveling mechanism, or fast braking crane lifting the weight of shaking violently, caused by lifting heavy objects cannot be accurately in place. When braking noise, like stage equipment and automation equipment requirements for brake braking when the noise is small, requires low brake noise. And some like printing equipment, cutting equipment, lifting equipment for brake and electric function frequent braking. Crane with F.K series reducer special electromagnetic braking motor selection: Drive reducer of hoisting machinery equipment now more and more with FC series and KC series reducer. Hoisting machinery equipment in the drive reducer of the selected FC and KC series reducer has the following requirements: the first is to slow down function in reliability, long service life. The second reducer can't leak as far as possible; The noise of the third reducer general requirements is not very high, this is because the crane at runtime the driving wheel and rail made a lot of noise completely obscures the reducer running noise. Drive reducer is hoisting machinery equipment lifting heavy objects from somewhere to the specified location, is the use of more frequent lifting machinery and equipment technical requirements higher core parts. Can run back and forth frequently and reliable, and can locate precise, stable and reliable braking, so the power of motor part the reducer and have special requirements. The choice of brake motor performance decided the quality of the hoisting machinery equipment.
The hoisting machinery equipment configuration power motor to drive reducer of the points of two kinds: one kind is a conical rotor brake motor; The other is a common additional plane brake three-phase asynchronous motor. Conic rotor brake motors advantages of cheap, but the taper rotor brake motor axial moving big, cooperate with reducer is difficult; Braking torque, brake speed, but the motor running noise is very large. Hoisting machinery equipment which is caused by braking www.dongfeng-motor.com speed heavy cargo, heavy weight swing caused by the vibration of hoisting machinery equipment, even cheating. And because the end fast brake of the taper rotor brake motor, hoisting machinery equipment in large inertia force under the action of forward, in the input and output end of the reducer a huge force of backward, because of the taper rotor brake motor has the input end of the drive reducer braking completely, and the output end of the drive reducer as hoisting machinery equipment in large inertia force under the action of forward, driving speed reducer gear damage, under the action of repeated even reducer casing shatter. Additional plane brake and ordinary three-phase asynchronous motor electromagnetic brake has run without axial channeling. Low noise, when hoisting small inertia of the taper rotor brake motor, brake is by the ac 380 v, 220 v) two phase rectifier dc 170 v, 99 v), often damaged during frequent start-stop rectifier, resulting in motor because it could not open the brake and can't be used normal hoisting machinery equipment. There are two kinds of this kind of brake motor connection; As long as give a slow brake, brake motor three-phase 380 v alternating current (ac), motor for electric brake and braking to electricity at the same time, the motor starts, but brake because the reason of the rectifier to delay 0.5 seconds to 1 seconds to open the brake, the motor is started, in 0.5 seconds to 1 seconds when the motor is belong to the blocked state, the current of motor is seven times the rated current, lifting machinery and equipment running back and forth frequently, need to constantly frequently, this motor fever easily burn out brake soon.
So in hoisting machinery equipment configuration power motor drive reducer is allows of no delay to 1 seconds to 0.5 seconds to open the brake, requirements in the motor brake motor electric brake at the same time also to open. It can only choose fast braking method; A brake rectifier choose fast rectifier, B brake rectifier dc output terminal lead two wires to the motor control of the main contactor normally open contacts (individual must bring two control line); The motor of electric brake also open at the same time. But the motor in the loss of electric motor power brake immediately brake, the ship caused by hoisting machinery equipment weight, huge heavy weight swing caused the vibration of hoisting machinery equipment, even cheating. And because the end fast brake of the brake motor, hoisting machinery equipment in large inertia force under the action of forward, in the input and output end of the reducer a huge force of reverse, because the brake motor has the input end of the drive reducer braking completely, and the output end of the drive reducer as hoisting machinery equipment in large inertia force under the action of forward, driving speed reducer gear damage, under the action of repeated even reducer casing shatter. And fast brake of the brake motor brake rectifier is more easy to burn out. The hoisting machinery equipment manufacturers and reducer. Later, some factories use advanced three-phase ac electromagnetic brake. The ac brake has got electric brake motor open at the same time, the brake torque can be adjustable from 0 to the maximum braking moment, when the motors and three-phase ac brakes brake coil two connected together, after the external power supply disconnect the power of the motor through communication line brake coil into discharge circuit, so that the brake delay release, the hoisting machinery equipment drive reducer prepared by dynamic braking motor slow 0.5 seconds - 1 seconds, attain the goal of hoisting machinery equipment running smoothly. Because ac brake domestic few batch use. Cause manufacturer brake technology does not pass as well as the production of brake motor manufacturers in debugging the brake when debugging is undeserved, ac brake damage rate is very high.
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