Baldor motor Germany Baldor model Baldor price

Baldor 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, voltage levels of 3300V and 6600V are also available. 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 (e.g., 300KW/380V), the current is limited by the allowable carrying capacity of the conductors, making it difficult to increase further or resulting in excessive costs. High voltage is required to achieve high-power output. Advantages of high-voltage motors include high power and strong shock resistance; disadvantages include high inertia, making starting and braking difficult.

Baldor motor maintenance methods

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

Baldor motor fault handling

Motor winding short circuits are caused by insulation damage due to excessive motor current, large fluctuations in power supply voltage, single-phase operation, mechanical damage, poor manufacturing, etc. They are classified as inter-turn short circuits, inter-winding short circuits, inter-pole short circuits, and inter-phase short circuits. 1. Fault phenomena: uneven magnetic field distribution, unbalanced three-phase current causing increased vibration and noise during motor operation; in severe cases, the motor cannot start, and large short-circuit currents generated in the shorted coils cause rapid heating and burnout. 2. Causes: long-term overload causing insulation aging and loss of insulating properties; insulation damage during winding insertion; moisture absorption reducing insulation resistance leading to breakdown; improper padding or damage to end and inter-layer insulation materials during shaping; damage to end connection wire insulation; insulation breakdown due to overvoltage or lightning strikes; insulation damage caused by friction between rotor and stator winding ends; metal foreign objects falling into the motor and excessive oil contamination. 3. Inspection methods: (1) External observation. Check the junction box and winding ends for charring; windings leave a dark brown residue with a burnt smell after overheating. (2) Temperature probing. Run under no-load for 20 minutes (stop immediately if abnormalities are detected) and use the back of the hand to check if any part of the winding exceeds normal temperature. (3) Power-on test. Use an ammeter to measure; if the current in one phase is excessively high, it indicates a short circuit in that phase. (4) Bridge measurement. Measure the DC resistance of each winding; generally, the difference should not exceed 5%. If it does, the phase with lower resistance has a short circuit fault. (5) Short-circuit detector method. If the tested winding has a short circuit, the steel sheet will vibrate. (6) Multimeter or megohmmeter method. Measure the insulation resistance between any two phase windings; if the reading is extremely low or zero, it indicates a short circuit between those two phases. (7) Voltage drop method. Connect the three windings in series and apply low-voltage safe AC power; the group with the lower reading has a short circuit fault. (8) Current method. Run the motor under no-load, first measure the three-phase currents, then swap two phases and measure again for comparison. If the readings do not change with the power swap, the phase with the higher current has a short circuit. 4. Short circuit handling methods: (1) Short circuit at the ends. Insulate the short circuit point, or re-wrap with insulated wire, then varnish and bake dry. (2) Short circuit in the slot. Soften the winding, locate and repair the short circuit point, reinsert into the slot, then varnish and bake dry. (3) For phase windings with fewer than 1/12 shorted turns, cut all shorted turns when connecting in series, connect the conductive parts to form a closed loop for emergency use. (4) When the number of shorted turns in the winding exceeds 1/12, completely remove and rewind.

Baldor motor structure

The motor mainly consists of the rotor, end covers, stator, and other components. The stator structure of a permanent magnet synchronous motor is very similar to that of a standard induction motor. The main difference in the rotor structure compared to an asynchronous motor is the presence of high-quality permanent magnet poles on the rotor. Depending on the placement of the permanent magnets on the rotor, permanent magnet synchronous motors are typically divided into surface-mounted rotor structures and interior-mounted rotor structures. The placement of permanent magnets significantly affects motor performance. Surface-mounted rotor structure: Permanent magnets are located on the outer surface of the rotor core. This structure is simple but produces very little asynchronous torque, making it suitable only for applications with low starting requirements; it is rarely used. Interior-mounted rotor structure: Permanent magnets are located within the core between the squirrel cage bars and the shaft. It offers good starting performance, and the vast majority of permanent magnet synchronous motors adopt this structure.

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