초록 ▼

A method and a device for electrical braking of an all-mains motor by which disconnection of supplied feed current to the motor causes an electric switching operation, whereby electric current arranged to cause a reversed rotary direction for the rotor (1) of the motor is supplie. According to the i

A method and a device for electrical braking of an all-mains motor by which disconnection of supplied feed current to the motor causes an electric switching operation, whereby electric current arranged to cause a reversed rotary direction for the rotor (1) of the motor is supplie. According to the invention, supplied braking power (P) is controlled and reduced on basis of the successive reduction of rotary speed for the motor until the rotor (1) of the motor has substantially completely ceased to rotate, preferably substantially corresponding to an inverted "soft start" for the motor, whereafter supplied braking current feed is interrupted. It is advantageously monitored whether or not normal start of the motor has been performed, electric switching to braking only being made possible provided that such a start sequence has been indicated.

대표청구항 ▼

[ What is claimed is:] [1.] Method for electrical braking of an all-mains motor by means of an electric switching operation of the feed current supplied to the motor intended to cause a reversed rotary direction for a rotor of the motor, said method comprising:monitoring whether or not a normal star

[ What is claimed is:] [1.] Method for electrical braking of an all-mains motor by means of an electric switching operation of the feed current supplied to the motor intended to cause a reversed rotary direction for a rotor of the motor, said method comprising:monitoring whether or not a normal start operation of the motor has been performed when supplied feed current to the motor is interrupted, andonly performing a switching operation arranged to cause braking when an abnormal start sequence is being indicated, andcontrolling supplied braking power and reducing supplied braking power on a basis of successively reduced rotary speed of the motor until the rotor of the motor has substantially or completely ceased to rotate, where after supplied feed of braking current is interrupted.