GROSCHOPP motors Germany GROSCHOPP models GROSCHOPP prices

GROSCHOPP motors refer to electric motors with a rated voltage above 1000V. Commonly used voltages are 6000V and 10000V; due to differences in foreign power grids, there are also voltage levels of 3300V and 6600V. High-voltage motors were developed because motor power is proportional to the product of voltage and current. Therefore, when the power of low-voltage motors increases to a certain extent (such as 300KW/380V), the current is limited by the allowable carrying capacity of the wires, making it difficult to increase further or resulting in excessive costs. High power output requires increasing the voltage. Advantages of high-voltage motors include high power and strong shock resistance; disadvantages include high inertia, making starting and braking difficult.

GROSCHOPP motor control principles

Motor control principle: First, the control unit must determine the sequence for turning on the power transistors in the inverter based on the rotor position detected by the hall-sensor, according to the stator winding configuration. This involves the AH, BH, CH (known as upper-arm power transistors) and AL, BL, CL (known as lower-arm power transistors) in the inverter. This causes current to flow through the motor coils in sequence, generating a forward (or reverse) rotating magnetic field that interacts with the rotor magnets, thereby causing the motor to rotate clockwise or counterclockwise. When the motor rotor rotates to a position where the hall-sensor detects another set of signals, the control unit turns on the next group of power transistors. This cycle allows the motor to continue rotating in the same direction until the control unit decides to stop the rotor by turning off the power transistors; to reverse the rotor, the power transistor switching sequence is reversed. Basically, the power transistor switching can be exemplified as follows: AH and BL pair → AH and CL pair → BH and CL pair → BH and AL pair → CH and AL pair → CH and BL pair. However, AH and AL, or BH and BL, or CH and CL must never be turned on simultaneously.

GROSCHOPP motor speed control

Motor speed control: Pole-changing speed control achieves speed regulation by changing the wiring method of the stator windings to alter the number of pole pairs in the squirrel-cage motor stator. Characteristics are as follows: 1, it has stiff mechanical characteristics and good stability; 2, no slip loss, high efficiency; 3, simple wiring, convenient control, low cost; 4, stepped speed control with large step differences, unable to achieve smooth speed regulation; 5, can be used in combination with voltage-regulating speed control and electromagnetic slip clutches to achieve efficient smooth speed regulation characteristics. This method is suitable for production machinery that does not require stepless speed control, such as metal cutting machine tools, elevators, lifting equipment, fans, and water pumps. Variable frequency speed control changes the frequency of the stator power supply to the motor, thereby changing its synchronous speed. The main equipment in a variable frequency speed control system is the inverter that provides variable frequency power. Inverters can be divided into two categories: AC-DC-AC inverters and AC-AC inverters; AC-DC-AC inverters are mostly used domestically. Their characteristics: 1, high efficiency, no additional losses during speed regulation; 2, wide application range, suitable for squirrel-cage asynchronous motors; 3, wide speed regulation range, stiff characteristics, high precision; 4, complex technology, high cost, difficult maintenance and repair. 5, this method is suitable for occasions requiring high precision and good speed regulation performance. Cascade speed control involves inserting an adjustable additional electromotive force into the rotor circuit of a wound-rotor motor to change the motor slip, achieving speed regulation. Most of the slip power is absorbed by the inserted additional electromotive force, and then additional devices are used to return the absorbed slip power to the grid or convert the energy for utilization. Based on the method of absorbing and utilizing slip power, cascade speed control can be divided into motor cascade speed control, mechanical cascade speed control, and thyristor cascade speed control. Thyristor cascade speed control is mostly adopted, with the following characteristics: 1, slip losses during speed regulation can be fed back to the grid or production machinery, resulting in higher efficiency; 2, device capacity is proportional to the speed regulation range, saving investment, suitable for production machinery with a speed regulation range of 70%－90% of rated speed; 3, in case of speed control device failure, it can switch to full-speed operation to avoid production stoppage; 4, thyristor cascade speed control has a low power factor and significant harmonic impact. 5, this method is suitable for use on fans, water pumps, steel rolling mills, mine hoists, and extruders.

GROSCHOPP motor operating modes

Motor starting methods: Soft start. With the rapid development of microcomputer control technology, a batch of electronic soft start controllers have been successfully developed in relevant control engineering fields and are widely used in the motor starting process, replacing reduced-voltage starters. Current electronic soft start facilities use thyristor voltage-regulating circuits. The circuit configuration is as described: six thyristors, connected in anti-parallel pairs and then in series to the three-phase power supply. After the system sends a start signal, the microcomputer-controlled starter system immediately performs data calculations, sending trigger signals to the thyristors to control their conduction angle. Based on the given output, the output voltage is adjusted to achieve motor control. This starting method is suitable for starting control of three-phase AC asynchronous motors of various power ratings, including six-wire and three-wire connection methods. Direct start. This starting method is the most basic and simplest. First, a knife switch is used to connect the motor to the power grid. At this point, the motor starts and runs at rated voltage. Characteristics of this method include: low investment, simple equipment, small quantity. Although the starting time is short, the starting torque is small and the current is large, making it more suitable for starting small-capacity motors. Reduced-voltage start. Due to the significant disadvantages of direct starting, reduced-voltage starting was developed. This starting method is suitable for no-load and light-load conditions. Since reduced-voltage starting simultaneously limits starting torque and starting current, the working circuit needs to be restored to rated status after the starting process is completed.

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