Schneeberger motor Germany Schneeberger model Schneeberger price

Schneeberger motors are machines used to convert mechanical energy and AC electrical energy into each other. Due to the tremendous development of AC power systems, AC motors have become the most commonly used motors. Compared with DC motors, AC motors have a simple structure, are easy to manufacture, are relatively robust, and can be easily made into high-speed, high-voltage, high-current, and high-capacity motors because they do not have commutators (see commutation of DC motors). The power coverage range of AC motors is very large, from a few watts to hundreds of thousands of kilowatts, or even millions of kilowatts. In the early 80s of the 20th century, the largest steam turbine generator had reached 150 ten thousand kilowatts.

Schneeberger motor maintenance methods

When the no-load current of the motor exceeds the limit data, it indicates that the motor has failed. Reasons for high no-load current in motors include large internal mechanical friction, partial short circuits in coils, and demagnetization of magnetic steel. We continue to perform related tests and inspection items to further determine the cause or location of the fault. When the no-load/load speed ratio of the motor is greater than 1.5, turn on the power and rotate the throttle handle to make the motor run at high speed no-load for more than 10s. After the motor speed stabilizes, measure the maximum no-load speed N1 of the motor at this time. Under standard test conditions, travel a distance of more than 200m and begin to measure the maximum load speed N2 of the motor. No-load/load speed ratio = N2 ÷ N1. When the no-load/load speed ratio of the motor is greater than 1.5, it indicates that the demagnetization of the motor's magnetic steel is quite severe, and the entire set of magnetic steel inside the motor should be replaced; in actual electric vehicle maintenance, it is generally common to replace the entire motor. The direct cause of motor heating is high current. The relationship between motor current I, motor input electromotive force E1, motor rotational induced electromotive force (also called back EMF) E2, and motor coil resistance R is: I = (E1-E2) ÷ R. An increase in I indicates that R has decreased or E2 has decreased. A decrease in R is generally caused by coil short circuits or open circuits, while a decrease in E2 is generally caused by magnetic steel demagnetization or coil short circuits/open circuits. In the practice of maintaining the entire electric vehicle, the method for dealing with motor heating faults is generally to replace the motor. Whether high-speed or low-speed motors, mechanical collisions or discontinuous irregular mechanical noise should not occur during load operation. Different types of motors can be repaired using different methods. The reasons for short driving range and weak motor performance (commonly known as lack of power) are complex. However, after excluding the above 4 types of motor faults, generally speaking, the fault of short driving range is not caused by the motor, but is related to battery capacity attenuation, charger inability to fully charge, controller parameter drift (PWM signal not reaching 100%), etc. Phase loss in brushless motors is generally caused by damage to the Hall elements of the brushless motor. We can determine which Hall element is faulty by measuring the resistance of the Hall element output leads relative to the Hall ground line and the Hall power supply lead, using a comparison method. To ensure the accuracy of the motor commutation position, it is generally recommended to replace all three Hall elements simultaneously. Before replacing the Hall elements, it is necessary to clarify whether the motor's phase electrical angle is 120° or 60°. Generally, for 60° degree phase angle motors, the three Hall elements are placed in parallel. For 120° degree phase angle motors, the middle Hall element among the three is placed in a flipped 180° position.

Schneeberger motor performance

For motor drive circuits, the following performance indicators are mainly considered: 1, output current and voltage range. This determines the power of the motor that the circuit can drive; 2, efficiency. High efficiency not only means saving power but also reduces heat generation in the drive circuit. To improve circuit efficiency, one can start by ensuring the switching state of power devices and preventing shoot-through (a problem that may occur in H bridge circuits, where two power devices conduct simultaneously, causing a power supply short circuit); 3, impact on the control input terminal. The power circuit should have good signal isolation for its input terminal to prevent high voltage and large current from entering the main control circuit, which can be achieved using high input impedance or optocouplers; 4, impact on the power supply. Shoot-through can cause instantaneous drops in power supply voltage, resulting in high-frequency power pollution, and large currents may cause ground potential fluctuations; 5, reliability. The motor drive circuit should be designed so that it remains safe regardless of the control signal applied or the passive load connected. Input signal lines are introduced through Port; pin Port1 is the motor direction signal input terminal; pin Port2 is the PWM signal input terminal; pin Port3 is the ground line. Note that pin Port3 is connected to ground via a 2kΩ resistor. When the driver board and microcontroller are powered separately, this resistor provides a path for signal current return. When the driver board and microcontroller share a power supply, this resistor prevents large currents from flowing along the connection into the microcontroller motherboard's ground line, causing interference. In other words, it isolates the driver board's ground from the microcontroller's ground, achieving 'single-point grounding'. Capacitor C1 prevents sudden voltage drops caused by abrupt motor startup. NAND gate U1A modulates the PWM signal with the motor direction signal, converting it into a square wave signal with an amplitude close to the power supply voltage.

Schneeberger motor principle

After symmetrical voltage is applied to the motor stator winding, a rotating air gap magnetic field is generated. The rotor winding conductors cut this magnetic field, generating induced electromotive force. Since the rotor winding is in a short-circuit state, a rotor current is generated. The interaction between the rotor current and the air gap magnetic field produces electromagnetic torque, thereby driving the rotor to rotate. The motor speed must be lower than the synchronous speed of the magnetic field, because only then can the rotor conductors induce electromotive force to generate rotor current and electromagnetic torque. Therefore, this motor is called an asynchronous motor, also known as an induction motor. The motor speed (rotor speed) is less than the speed of the rotating magnetic field, hence it is called an asynchronous motor. It is basically the same as an induction motor. s = (ns-n) / n, where s is the slip rate, ns is the magnetic field speed, and n is the rotor speed. There are many types of asynchronous motors, including explosion-proof three-phase asynchronous motors, ys series three-phase asynchronous motors, y, y2 series three-phase asynchronous motors, and YVP series variable frequency speed regulation motors, etc.

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