Automatic double-speed control motor after secondary electrification

Abstract

An automatic double-speed control motor after secondary electrification comprises a motor excitation soft coil (1), a motor excitation hard coil (2), an electric brush (3), a motor rotor (4), a control box (5), a reverse direction contactor, a forward direction contactor, a direction relay (54), a secondary reverse rotation controller (55), a control relay (56) and the like, the automatic double-speed control motor after secondary electrification is applied to an automobile electric winch and an electric fork truck hydraulic unit, a motor excitation hard coil (2), an electric brush (3) and a motor rotor (4) are connected in series, a motor excitation soft coil (1) is connected in parallel in the forward direction, the motor rotates in the forward direction, after secondary electrification operation is carried out within limited time, the motor excitation soft coil (1) does not participate in working, and the motor excitation soft coil (1) does not participate in working. And the electric brush (3) and the motor rotor (4) are conducted, the motor excitation hard coil (2) is reversely conducted, then the motor excitation hard coil (2) is reversely connected to the motor excitation soft coil (1) for parallel operation, and the motor rotates reversely.

Description

technical field [0001] The automatic double-speed control motor after the second power-on of the present invention is composed of a motor excitation soft coil, a motor excitation hard coil, a brush, a motor rotor, a control box, a direction relay, a secondary reverse controller, a control relay, and a forward contact Composed of copper strips for the reverse contactor, copper strips for the reverse contactor, moving contacts, springs, diodes, and coils, it is a mechatronic product that is widely used in electric winches for automobiles, hydraulic units for electric stackers, and electric tailgates for trucks. The field of commutation and acceleration control. Background technique [0002] The existing high-power DC motors generally adopt permanent magnet excitation and electric excitation, and the electric excitation is divided into series excitation, parallel excitation and compound excitation. [0003] DC series motors are generally used on automobile electric winches. Th...

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Problems solved by technology

[0003] DC series motors are generally used on automobile electric winches. This kind of DC series motor has large starting torque and high no-load speed. However, when commutating this type of motor, it is generally necessary to use Only four pairs of contactors with large area contacts can achieve reversing, the reversing efficiency is low, the loss is large, and the cost is high. Moreover, it is very difficult to adjust the speed of this type of high-current series-excited motor, and the magnetic field coil current of the parallel-excited DC motor is small. Only a pair of large-area contactors are needed to control the main circuit. The commutation control current is small, and it is relatively easy to achieve commutation and change the magnetic field to change the speed. However, the starting torque of this type of motor is not large, and the speed changes between no-load and load Small, it is difficult to meet the requirements of fast speed under light load and output torque under heavy load

[0004] On the other hand, the working current of the electric winch is large when the rope is retracted in the forward direction, and the working current is small when the rope is released in the reverse direction. Points and cables control the positive and negative rotation of the motor, which is wasteful and increases the cost and volume of the product

[0005] Existing electric winches generally only have one reduction ratio. Through the clutch handle, the free rope can be released in neutral. In fact, it needs to be fast when the load is light, but it is difficult to achieve with general electric winches, and it is difficult to improve work efficiency.

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