The characteristics of linear motor electric vehicles, in the use of electric rotary electric motor vehicles, generally through the gear to reduce the rotational torque into the train's traction, but also by the wheel and rail adhesion restrictions.
The linear motor is used for the propulsion and braking force of the linear motor electric vehicle. As described above, there are two types of sideways on the vehicle and on the ground. When the primary side is in the vehicle, the VVVF inverter and the linear motor are to be loaded on the vehicle, so that the weight of the vehicle is increased and the vehicle price is high; however, the apparatus on the ground has only the reaction plate, which reduces the construction cost. The way side 1 in the car has been practically applied in part of the subway.
In a linear motor electric vehicle, the propulsive force is directly transmitted by a reaction plate laid between the rails, so it is not limited by stickiness and may be freed from various problems caused by coasting and idling, facilitating the passage of a large ramp ( The line with a maximum gradient of 60 ¡ë to 80 ¡ë) and a small radius curve (minimum radius of 50 m). In addition, since the linear motor has no rotating parts, it does not need a bearing and a lubrication mechanism, making it simple in structure and prolonging the life, which is a feature of the linear motor.
In a rotating motor, the rotating torque is proportional to the square of its diameter, so to obtain a large rotating torque, the diameter of the motor must be increased. In a linear motor, this is equivalent to extending the corresponding portion in the length direction, and the height direction Can be reduced. In a large-sized motor, the wheel diameter must be increased if it is a one-stage gear deceleration, and it is not necessary in a linear motor drive, so that the diameter of the wheel can be reduced, which will reduce the height of the floor surface of the vehicle. The above advantages are the reason why the small-section subway adopts a linear motor electric vehicle.
However, the efficiency of the linear motor is low. Compared with the same subway, the power consumption is large. In addition to this drawback, the above advantages cannot be fully exerted. Because it is not limited by stickiness, the gradient of the line can be large when pulling; however, if the electric brake fails during braking, it must rely on mechanical braking, which is controlled by adhesion, so the slope of the line is Can not be too big. In addition, since the linear motor is a flat-shaped device, the height of the floor surface of the vehicle can be reduced, and the diameter of the wheel can also be reduced. However, the wear of small-diameter wheels will accelerate, so it cannot actually be too small. Since the length of the flat linear motor can be lengthened, a single bogie can be equipped with one motor, which is one of the reasons why the linear motor subway is currently being marshaled for the entire motor vehicle.
The standard U-type linear motor of Tongmao Linear Motors has a peak thrust of 2600N and a continuous thrust of 750N. Its positioning accuracy can reach 0.5UM, and it can be compatible with multi-brand motion controllers and actuators. At the same time, it is enriched with our linear motor industry. The institutional design, sample production and mass production experience can provide customers with customized linear motors that fully meet the requirements of high performance, high quality, low cost, and short delivery time.
This article originated from Kunshan Tongmao Electronics Co., Ltd. (
www.tmmotion.com) company original, reproduced please indicate the source.
Linear motor