ELRA motor Germany ELRA model ELRA price

ELRA motors have a set of adjustable eccentric weights installed on each end of the rotor shaft, utilizing the centrifugal force generated by the high-speed rotation of the shaft and eccentric weights to obtain excitation force. Vibration motors have a wide vibration frequency range; only when the excitation force and power are properly matched can mechanical noise be reduced. Vibration motors are classified into six categories, including classification by starting and operating mode, and by operating speed.

ELRA motor speed control

Motor speed control: A hydraulic coupling is a hydraulic transmission device, generally composed of a pump wheel and a turbine, collectively referred to as working wheels, placed in a sealed housing. The housing is filled with a certain amount of working fluid. When the pump wheel rotates driven by the prime mover, the fluid inside is pushed by the blades to rotate. Under the action of centrifugal force, as it enters the turbine along the outer ring of the pump wheel, it exerts thrust on the turbine blades in the same direction of rotation, thereby driving the production machinery. The power transmission capacity of the hydraulic coupling is consistent with the relative filling volume of fluid in the housing. During operation, changing the filling rate changes the turbine speed of the coupling, achieving stepless speed regulation. Its characteristics are: 1, wide power adaptation range, meeting the needs of different powers from tens of kilowatts to thousands of kilowatts; 2, simple structure, reliable operation, convenient use and maintenance, and low cost; 3, small size, large capacity; 4, convenient control and adjustment, easy to achieve automatic control. 5, this method is suitable for speed control of fans and water pumps. Variable frequency speed regulation range: 5-100 Hz stepless speed regulation. Below 50 Hz (60 Hz) is constant torque speed regulation; above 50 Hz (60 Hz) is constant power speed regulation. *The voltage boost of the variable frequency device ensures that the motor outputs rated torque at 5 Hz without burning out due to overheating. *Smooth torque at low speeds, no crawling phenomenon. *The motor can withstand 160% overload of rated torque for 1 minutes. Equipped with a gear transmission motor (friction wheel) with variable transmission ratio.

ELRA motor advantages

The motor can be integrally mounted on the wheel axle, forming an integrated direct drive system, where one wheel axle is one drive unit, eliminating the need for a gearbox. Advantages of permanent magnet synchronous motors: High power efficiency and high power factor of the permanent magnet synchronous motor itself; low heat generation of the permanent magnet synchronous motor, resulting in a simple, compact, and low-noise motor cooling system; the system adopts a fully enclosed structure, with no transmission gear wear, no transmission gear noise, oil-free and maintenance-free; the permanent magnet synchronous motor allows large overload current, significantly improving reliability; the entire transmission system is lightweight, with unsprung weight lighter than traditional wheel axle transmissions, and high power per unit weight; since there is no gearbox, the bogie system can be designed freely, such as flexible bogies and single-axle bogies, greatly improving the dynamic performance of the train. Due to the use of permanent magnet material poles, especially rare earth metal permanent magnets (such as neodymium iron boron), which have high magnetic energy product, higher air gap magnetic flux density can be obtained. Therefore, at the same capacity, the motor is smaller in volume and lighter in weight. The rotor has no copper loss and iron loss, nor friction loss of slip rings and brushes, resulting in high operating efficiency. Small moment of inertia, large allowable pulse torque, high acceleration, good dynamic performance, compact structure, and reliable operation.

ELRA motor mechanical characteristics

Mechanical characteristics of the motor: The torque of a single-phase series-wound motor varies with time, meaning the torque magnitude is different at every instant, which is significantly different from the smoothness of DC motor torque; the output torque is actually the average value. When the motor's magnetic circuit is not saturated, since the magnetic flux is proportional to the excitation current, the torque is proportional to the square of the current; when the motor's magnetic circuit is saturated, the change in current has little effect on the magnetic flux, so the torque changes approximately in accordance with the current. Large starting torque, not prone to stalling, is a valuable advantage of this type of motor, suitable for occasions where starting is difficult. With constant applied voltage and unsaturated magnetic circuit, as the load increases, the armature current increases accordingly, thus the magnetic flux and resistive voltage drop also increase. From the expression of speed, it can be seen that the speed drops rapidly; conversely, under no-load conditions, the current and magnetic flux are very small, and the no-load speed is very high, which can easily damage the motor. For safety and motor protection, no-load operation of the motor should be avoided as much as possible. However, for series-wound motors used in power tools, since they generally carry a working head, their no-load speed will not be too high, and the design often limits the no-load speed to about 1.7 times the rated speed. For very low-power series-wound motors, because the self-torque is large, the no-load speed will not be extremely high. As the load increases, the speed decreases, causing little change in output power, making it difficult for the motor to overload due to increased load. This characteristic makes this type of motor widely used in occasions with large changes in load torque, with a wide speed regulation range. Speed variation with load change: When the load increases, the current in the armature winding increases accordingly. Since the stator excitation winding is in series with the armature winding, the current in the stator excitation winding is the same as that in the armature winding, so it also increases, thereby increasing the magnetic flux. Since magnetic flux is inversely proportional to speed, the speed decreases. The increase in current increases the resistive voltage drop in each part, causing the electromotive force to drop, which further causes the speed to decrease. Therefore, compared with the mechanical characteristics of DC motors, the mechanical characteristics of single-phase series-wound motors are softer, making speed control more difficult.

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