BODINE motor Germany BODINE model BODINE price

BODINE motors are permanent magnet motors commutated or controlled by electronic circuits. Permanent magnet brushless motors come in two types: sine wave drive and square wave drive; those with rectangular wave drive current are commonly referred to as permanent magnet brushless DC motors, while those with sine wave drive current are commonly referred to as permanent magnet AC servo motors. Based on sensor type, they can be classified into sensor-equipped motors and sensorless motors.

BODINE motor speed control

An impeller is added between the motor shaft and the load shaft to regulate the pressure of the liquid (usually oil) between the impellers, thereby achieving the goal of adjusting the load speed. This speed control method is essentially a slip power consumption approach. Its main disadvantages are that efficiency decreases as speed drops, installation requires disconnecting the motor from the load, maintenance workload is high, and components such as shaft seals and bearings need to be replaced periodically. The site is generally dirty, making the equipment appear low-grade, and it is considered an obsolete technology. Manufacturers who were initially interested in speed control technology either did not have high-voltage speed control options available at the time or considered cost factors, leading to some applications of fluid couplings. Examples include water pumps for water companies, boiler feed pumps and induced draft fans for power plants, and dust removal fans for steel mills. Today, some older equipment is gradually being replaced by high-voltage variable frequency drives during retrofits. The inverter is a low-voltage inverter, using an input step-down transformer and an output step-up transformer to interface with the high-voltage grid and the motor. This was a transitional technology when high-voltage variable frequency technology was not yet mature. Due to the low voltage of the low-voltage inverter, the current cannot increase indefinitely, limiting the capacity of this type of inverter. The presence of the output transformer reduces system efficiency and increases the footprint. Additionally, the magnetic coupling capability of the output transformer weakens at low frequencies, reducing the inverter's load-carrying capacity during startup. It generates significant harmonics to the grid. Using 12 pulse rectification can reduce harmonics, but it does not meet strict harmonic requirements. The output transformer amplifies the dv/dt generated by the inverter to the same extent, so filters must be installed to make it suitable for standard motors; otherwise, corona discharge and insulation damage may occur. Using special variable frequency motors can avoid this situation, but it is not as effective as using high-low type inverters.

BODINE motor classification

In a single-layer winding, only one effective side of a coil is placed in each stator slot, so the total number of coils is only half the total number of slots in the motor. The advantages of single-layer windings are fewer coils, simpler craftsmanship, no inter-layer insulation leading to higher slot utilization, and no phase-to-phase breakdown faults due to the single-layer structure. The disadvantages are that the electromagnetic waveform generated by the winding is not ideal, resulting in higher iron losses and noise, and slightly poorer starting performance. Therefore, single-layer windings are generally used only in small-capacity asynchronous motors. Single-layer windings can be classified into chain windings, cross-chain windings, concentric windings, and cross-concentric windings based on the shape of the coils and the arrangement of the end connections. Chain windings consist of single-layer coil elements with the same shape and width, named because the coils at the ends of the winding resemble linked chains. For single-layer chain windings, it is particularly important to note that the coil pitch must be an odd number; otherwise, the winding cannot be arranged. For cross-chain windings, when the number of slots per pole per phase 9 is an odd number greater than 2, chain windings cannot be arranged, and cross windings with single and double coils must be used. In concentric windings, all coils within the same pole-phase group surround the same center. When the number of slots per pole per phase Q is an even number greater than 2, concentric windings can be used. The advantages of single-layer concentric and cross-concentric windings are simpler winding and embedding processes, while the disadvantage is that the coil ends are too long, consuming excessive wire. Apart from occasional use in small-capacity 2-pole and 4-pole motors, this winding form is rarely used today.

BODINE motor mechanical characteristics

Motors serve as actuators in automatic control devices. Each input pulse signal advances the stepper motor by one step, hence it is also called a pulse motor. Stepper motors are widely used in peripheral equipment for digital computers, as well as in printers, plotters, and disk drives. The drive power supply for stepper motors consists of a variable-frequency pulse signal source, a pulse distributor, and a pulse amplifier, which provide pulse current to the motor windings. The operating performance of a stepper motor depends on good coordination between the motor and the drive power supply. The advantages of stepper motors are no cumulative error, simple structure, easy use and maintenance, low manufacturing cost, and high ability to drive load inertia, making them suitable for small and medium-sized machine tools and applications with low speed precision requirements. The disadvantages are lower efficiency, significant heat generation, and occasional "step loss".

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