joventa motor Germany joventa model joventa price

joventa motors are permanent magnet motors commutated or controlled by current via electronic circuits. Permanent magnet brushless motors come in two types: sine wave drive and square wave drive. Those with rectangular wave drive current are commonly referred to as permanent magnet brushless DC motors, while those with sine wave drive current are commonly referred to as permanent magnet AC servo motors. Based on sensor type, they can be classified into sensor-equipped motors and sensorless motors.

joventa motor speed measurement method

The motor converts pulse signals into angular or linear displacement. First, it has good overload capacity. Its speed is not affected by the load size; unlike ordinary motors, which experience a drop in speed when the load increases, stepper motors have strict requirements for speed and position during use. Second, control is convenient. Stepper motors rotate in "steps," exhibiting distinct digital characteristics. Third, the overall structure is simple. Traditional mechanical speed and position control structures are complex and difficult to adjust; using stepper motors simplifies and compacts the overall structure. A tachometer generator converts rotational speed into voltage and transmits it to the input end as a feedback signal. A tachometer generator is an auxiliary motor; installed at the rear end of a standard DC motor, it feeds voltage back to the DC power supply to control the DC motor's speed.

joventa motor mechanical characteristics

The basic characteristics of the motor are that the rotor winding does not need to be connected to another power source, and its stator current is drawn directly from the AC power system. Compared with other motors, asynchronous motors have a simple structure, are easy to manufacture, use, and maintain, offer high operational reliability, are lightweight, and have low costs. Taking a three-phase asynchronous motor as an example, compared to a DC motor of the same power and speed, the former weighs only half as much and costs only one-third as much. Asynchronous motors can also easily derive various product series to meet different environmental conditions. They also have load characteristics close to constant speed, meeting the requirements of most industrial and agricultural machinery drives. Their limitation is that their speed has a fixed slip relative to the synchronous speed of their rotating magnetic field (see asynchronous motor), resulting in poor speed regulation performance. In applications requiring a wide and smooth speed regulation range (such as driving rolling mills, hoists, large machine tools, etc.), they are less economical and convenient than DC motors. Furthermore, asynchronous motors draw reactive power from the power system for excitation during operation, which deteriorates the power factor of the power system. Therefore, in high-power, low-speed applications (such as driving ball mills, compressors, etc.), synchronous motors are more reasonable. Due to the large production volume and wide usage of asynchronous motors, they must have a wide variety of models and specifications to match various machinery. Therefore, special attention must be paid to standardization, serialization, and generalization in the design and production of asynchronous motors. Among various product series, the three-phase asynchronous motor series, with the largest output and widest usage, serves as the basic series; in addition, there are several derived series (series derived by making partial changes to the basic series) and specialized series (series with special structures designed for special needs).

joventa motor applications

The motor rotor has many small teeth evenly distributed, and the stator teeth have three excitation windings, whose geometric axes are sequentially offset from the rotor tooth axes. 0, 1/3, 2/3, (the distance between the axes of two adjacent rotor teeth is the tooth pitch, denoted by te), i.e., A aligns with tooth 1, B is offset to the right from tooth 2 by 1/3 te, C is offset to the right from tooth 3 by 2/3 te, A' aligns with tooth 5. Rotation: If phase A is energized while phases B and C are de-energized, due to the magnetic field effect, tooth 1 aligns with A (the rotor is not subjected to any force; the same applies below). If phase B is energized while phases A and C are de-energized, tooth 2 should align with B; at this time, the rotor moves to the right by 1/3 te, tooth 3 is offset from C by 1/3 te, and tooth 4 is offset from A by (te - 1/3 te) = 2/3 te. If phase C is energized while phases A and B are de-energized, tooth 3 should align with C; at this time, the rotor moves further to the right by 1/3 te, and tooth 4 is offset from A by 1/3 te. If phase A is energized while phases B and C are de-energized, tooth 4 aligns with A, and the rotor moves further to the right by 1/3 te. Thus, after the energization states of A, B, C, and A respectively, tooth 4 (i.e., the tooth preceding tooth 1) moves to phase A, and the motor rotor rotates one tooth pitch to the right. If energization continues in the sequence A, B, C, A..., the motor rotates to the right by 1/3 te per step (per pulse). If energized in the sequence A, C, B, A..., the motor reverses. It can be seen that the position and speed of the motor have a one-to-one correspondence with the number of conduction times (pulse count) and frequency. The direction is determined by the conduction sequence. However, considering torque, smoothness, noise, and angle reduction, the conduction state A-AB-B-BC - C-CA-A is often adopted, changing the original step size from 1/3 te to 1/6 te. Even by combining two-phase currents differently, 1/3 te can be changed to 1/12 te and 1/24 te, which is the basic theoretical basis for microstepping drive. It is not difficult to deduce: the motor stator has m phase excitation windings, whose axes are offset from the rotor tooth axes by 1/m, 2/m... (m-1)/m, 1. And by conducting electricity in a certain phase sequence, the motor can be controlled to rotate forward or reverse—this is the physical condition for rotation. As long as this condition is met, we can theoretically manufacture stepper motors with any number of phases; considering cost and other factors, two-, three-, four-, and five-phase motors are common in the market. Torque: Once the motor is energized, a magnetic field (magnetic flux Ф) is generated between the stator and rotor. When the rotor and stator are offset by a certain angle, a force F is produced, proportional to (dФ/dθ) S. Its magnetic flux Ф=Br*S. Br is the magnetic flux density, S is the magnetic conductive area. F is proportional to L*D*Br. L is the effective length of the iron core, D is the rotor diameter. Br=N·I/R. N·I is the ampere-turns of the excitation winding (current multiplied by turns), R is the magnetic reluctance. Torque = Force * Radius. Torque is proportional to the motor's effective volume * ampere-turns * magnetic flux density (considering only the linear state). Therefore, the larger the motor's effective volume, the greater the excitation ampere-turns, and the smaller the air gap between stator and rotor, the greater the motor torque, and vice versa.

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