Kranzle motor Germany Kranzle model Kranzle price

Kranzle motors consist of the motor body and the driver, representing a typical mechatronic product. Brushless motors refer to motors without brushes and commutators (or slip rings), also known as commutator-less motors. As early as the nineteenth century, when motors were first invented, the practical motors produced were of the brushless type, namely AC squirrel-cage asynchronous motors, which were widely used. However, asynchronous motors have many insurmountable drawbacks, resulting in slow development of motor technology. Transistors emerged in the mid-twentieth century, leading to the advent of DC brushless motors that use transistor commutation circuits to replace brushes and commutators. This new type of brushless motor is called an electronically commutated DC motor, which overcomes the drawbacks of the first generation of brushless motors.

Kranzle motor operating principle

The linear motor evolved from the corresponding rotary motor, and its operating principle is similar to that of ordinary rotary motors. The magnetic poles of a linear synchronous motor can be excited by DC excitation windings or by permanent magnets, with the permanent magnet type offering higher reliability and efficiency. When symmetrical three-phase sinusoidal AC current is applied to the three-phase stator windings, the combined effect of the resulting traveling wave magnetic field in the air gap and the permanent magnet pole field generates an electromagnetic thrust on the permanent magnet pole mover. If the primary is fixed, the magnetic poles move linearly in the direction of the traveling wave magnetic field under this electromagnetic thrust, and the speed of the magnetic poles is the same as the speed of the traveling wave magnetic field. Compared to linear induction motors, linear synchronous motors provide greater driving force, better control performance, and higher position accuracy. Therefore, linear synchronous motors are given more attention in drive systems for high-speed ground transportation and linear lifting devices, and various types of linear synchronous motors are the main choice for linear drives.

Kranzle motor speed control

The motor VFD is a low-voltage VFD. The input side uses a transformer to step down high voltage to low voltage, replacing the high-voltage motor with a special low-voltage motor. Motor voltage levels vary widely, with no uniform standard. This approach uses low-voltage VFDs with relatively small capacity, resulting in significant harmonics on the grid side. 12 pulse rectification can be used to reduce harmonics, but it does not meet strict harmonic requirements. When the VFD fails, the motor cannot be switched to run on the industrial frequency grid, causing issues in applications where shutdown is not possible. Additionally, both the motor and cables must be replaced, involving substantial engineering work. Feeding part of the rotor energy of the asynchronous motor back to the grid to change the rotor slip for speed control uses thyristor technology and requires wound-rotor asynchronous motors. However, industrial sites now almost exclusively use squirrel-cage asynchronous motors, making motor replacement very troublesome. The speed control range of this method is generally around 70%-95%, which is narrow. Thyristor technology easily causes harmonic pollution to the grid; as speed decreases, the grid-side power factor also drops, requiring compensation measures. Its advantage is that the VFD part has smaller capacity, making it slightly lower in cost than other high-voltage AC variable frequency speed control technologies. A variation of this speed control method is the internal feedback speed control system, which eliminates the transformer in the inverter part by integrating the feedback winding directly into the stator winding. This approach requires motor replacement, and its performance in other aspects is close to cascade speed control.

Kranzle motor common problems

Motor issues: 1. After the speed-controlled motor accelerates, the speed gradually decreases until it stops. In this situation, observe the changes in the ammeter pointer in the speed-controlled motor's electrical cabinet. If the indicated current increases sharply, overload protection devices such as the thermal relay of the main motor will inevitably trip, disconnecting the three-phase power supply to the main motor and stopping operation. At this point, carefully check whether the wiring terminals of the main motor circuit components and the AC contactor of the main motor, as well as the wiring connections of all overload protection devices such as thermal relays in the speed-controlled motor's electrical cabinet, are loose or have poor contact causing heating. If these areas have issues, poor contact between wires and components in the circuit will cause the current to increase rapidly after the main motor accelerates, triggering protective shutdown. When the speed-controlled motor runs at low speed, the working current of the main motor is small, so gradual speed decrease and shutdown do not occur. However, when the speed-controlled motor accelerates, the high electrical load reveals faults in electrical components. In practice, it is sometimes observed that wiring terminals in the speed-controlled motor's electrical cabinet heat up due to poor wire contact, even forming oxide layers at the connections, and the wire insulation burns and discolors. These issues seriously affect the normal operation of the main drive motor. Operators must immediately take appropriate measures, such as cleaning the contact surfaces of wiring terminals and wires, tightening wiring screws, removing burnt oxide layers from wires, and replacing severely damaged wiring terminals. 2. The main drive motor produces excessive noise during operation. To adjust the dynamic balance of the slip motor, balancing weights are installed at both ends of the armature and magnetic pole rotor. If these devices become slightly loose, the slip motor will deviate from its original position during high-speed rotation. If the fault occurs on the outer surface of the main drive motor, it causes local friction between the armature and the magnetic pole rotor, increasing noise. In this case, shutdown for repair is required to restore the dynamic balance of the armature and magnetic pole rotor, reposition and secure the original balancing weights, and ensure normal operation of the main drive motor.

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