MAXCESS motor Germany MAXCESS model MAXCESS price

MAXCESS 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 voltage is required to achieve high-power output. The advantages of high-voltage motors include high power and strong shock resistance; the disadvantages include high inertia, making starting and braking difficult.

MAXCESS motor control methods

Motor constant V/f control method: The constant V/f control method for permanent magnet synchronous motors is similar to that for AC induction motors. It controls the amplitude and frequency of the motor input voltage to change simultaneously, thereby keeping the motor flux constant. The constant V/f control method can meet the requirements of wide-range speed regulation systems. Even without feedback of physical signals such as current, voltage, or position, it can still achieve a certain level of control accuracy, which is the greatest advantage of the constant V/f control method. The constant V/f control method features simple control algorithms and low hardware costs, and has been widely used in the field of general-purpose inverters. The disadvantages of the constant V/f control method are also obvious. Since there is no feedback of speed, position, or any other signals during the control process, it is almost impossible to obtain information on the motor's operating status, let alone precisely control speed or electromagnetic torque. The system performance is average, and the dynamic response is poor. Especially when the target speed changes or the load changes suddenly, problems such as step loss and oscillation are prone to occur. Obviously, this control method cannot separately control torque and excitation current, and large excitation currents often exist during the control process, affecting motor efficiency. Therefore, this control method is commonly used in general-purpose inverters with lower performance requirements, such as air conditioners, conveyor belt drive control in assembly lines, and energy-saving operation of water pumps and fans.

MAXCESS motor performance

Motor technology has been widely used in the aviation, aerospace, and mold industries. High-speed machine tools and virtual axis machine tools represent major breakthroughs in machine tool technology. Whether for ordinary CNC machine tools or virtual axis machine tools, the key component for achieving high speeds remains the spindle unit. Spindle high-speed capability is commonly measured by the dn value (the dn value refers to the product of the average diameter (mm) of the spindle bearings and the limit speed (r/min) of the spindle). With the development of bearing and lubrication technologies, spindle speeds have increased year by year. Data shows that after the development of oil-air lubrication devices and the adoption of angular contact ceramic ball bearings, new lubrication methods such as jet lubrication were adopted in the 90s. For spindle units with speeds above 10000r/min, driving via belts or couplings is no longer suitable. A more reasonable approach is to use a built-in motor for direct drive, where the motor rotor is directly mounted on the spindle and the stator is installed in the spindle sleeve, forming what is known as an electric spindle. This electric spindle has advantages such as compact structure, ease of balancing, and high transmission efficiency, making it an ideal structure for high-speed spindles. In addition to being significantly affected by bearings and their lubrication technology, the performance of electric spindles is influenced by many other factors, including bearing preload control, heat generation and cooling of the built-in motor, dynamic balancing of the spindle, and the connection of parts on the shaft.

MAXCESS motor operating modes

Several methods for obtaining excitation current in motors: 1. DC generator excitation method: This excitation method uses a dedicated DC generator, known as a DC exciter. The exciter is generally coaxial with the generator. The generator's excitation winding obtains DC current from the exciter through slip rings mounted on the main shaft and fixed brushes. This excitation method has advantages such as independent excitation current, reliable operation, and reduced auxiliary power consumption. It was the main excitation method for generators in past decades and has mature operational experience. The disadvantages are slow excitation regulation speed and heavy maintenance workload, so it is rarely used in units above 10MW. 2. AC exciter excitation method: Some modern large-capacity generators use an AC exciter to provide excitation current. The AC exciter is also mounted on the generator's main shaft. Its output AC current is rectified and supplied to the generator rotor for excitation. In this case, the generator's excitation method belongs to separate excitation. Since a static rectifier device is used, it is also called separate excitation static excitation. An AC pilot exciter provides the excitation current. The AC pilot exciter can be a permanent magnet measuring device or an AC generator with a self-excited constant voltage device. To improve the excitation regulation speed, the AC exciter typically uses a medium-frequency generator of 100–200HZ, while the AC pilot exciter uses a medium-frequency generator of 400–500HZ. The DC excitation winding and three-phase AC winding of this generator are both wound in the stator slots. The rotor has only teeth and slots without windings, resembling a gear. Therefore, it has no rotating contact components such as brushes or slip rings, offering advantages such as reliable operation, simple structure, and convenient manufacturing processes. The disadvantages are higher noise and larger harmonic components in the AC electromotive force. 3. Excitation method without an exciter: In this excitation method, no dedicated exciter is installed. Instead, the excitation power is obtained from the generator itself, rectified, and then supplied to the generator for excitation, known as self-excited static excitation. Self-excited static excitation can be divided into self-shunt excitation and self-compound excitation. The self-shunt excitation method obtains excitation current through a rectifier transformer connected to the generator outlet, which is then rectified and supplied to the generator for excitation. This method has advantages such as simple structure, fewer devices, cost savings, and less maintenance workload. The self-compound excitation method, in addition to having a rectifier transformer, also includes a high-power current transformer connected in series in the generator stator circuit. The function of this transformer is to provide a larger excitation current to the generator in the event of a short circuit, compensating for the insufficient output of the rectifier transformer. This excitation method has two excitation power sources: a voltage source obtained through the rectifier transformer and a current source obtained through the series transformer.

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