Design scheme applied to shutdown braking of series excited machine by using bilateral stator exciting winding

Abstract

The invention provides a design scheme applied to a series excited machine for shutdown braking by using a bilateral stator exciting winding, which comprises wire harnesses W1, W2, W3 and W4, a stator winding A, a stator winding B and a motor armature winding M. The stator winding A and the stator winding B are connected in series, the two ends of the stator winding A and the stator winding B are respectively connected with the W1 and the W3, the two ends of the positive electrode and the negative electrode of the motor armature winding M are respectively connected with the W2 and the W4, and when the motor is electrified to operate, the W1 and the W2 are electrified, and the W3 and the W4 are conducted; when the motor runs and the machine encounters an emergency cover opening condition, the stator winding A, the stator winding B and the armature winding M are connected in series to form a closed loop through switch conversion, power failure of W1 / W2, conduction of W1 and W4 and conduction of W2 and W3, the closed loop generates reverse induced current under excitation of a residual magnetic field of the armature winding of the series excitation motor, reverse torque is formed, and the stator winding A, the stator winding B and the armature winding M are connected in series. And the motor quickly stops running and braking, so that the braking function is realized. The braking time is greatly shortened, the braking effect is better, the motor only needs to be connected with four outgoing lines, and more cost is saved.

Description

technical field [0001] The invention relates to the technical field of electric motors, in particular to a design scheme for stopping and braking applied to series-excited electric motors using bilateral stator excitation windings. Background technique [0002] Now with the improvement of people's quality of life, food processing is more dependent on machine processing, so the safety requirements of food processors are getting higher and higher. When special circumstances are encountered during the work of food processors, such as operators mistakenly put the lid on the cup When it is opened, the mixing tool driven by the motor is required to stop running immediately to avoid personal injury. According to the national standard, the knife head must stop rotating within 1.5 seconds after the machine is opened. The popular explanation is the braking function. At present, most of the food processors using series excitation motors on the market use the single-side stator excitati...

AI Technical Summary

Problems solved by technology

[0005] In the traditional braking scheme, the motor needs to be connected with five lead wires to realize the braking function, and the wiring harness is cumbersome

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