oemer motor Germany oemer model oemer price

oemer motor is a device that converts electrical energy into mechanical energy. It uses energized coils (i.e., stator windings) to generate a rotating magnetic field, which acts on the rotor (such as a squirrel-cage closed aluminum frame) to form electromagnetic rotational torque. Motors are classified into DC motors and AC motors based on the power supply used. Most motors in power systems are AC motors, which can be synchronous motors or asynchronous motors (the speed of the motor's stator magnetic field does not remain synchronized with the rotor's rotational speed). A motor mainly consists of a stator and a rotor. The direction of motion of current-carrying conductors under force in a magnetic field is related to the current direction and the direction of magnetic flux lines (magnetic field direction). The working principle of a motor is that the magnetic field exerts force on the current, causing the motor to rotate.

oemer motor classification

Theoretically, a single-phase motor can be started if measures are taken to create a certain phase difference between the AC currents flowing through its two sets of windings. How to create a certain phase difference between magnetomotive forces or magnetic fluxes that are already spatially offset by a certain angle is the starting point for solving the starting problem. Based on this, single-phase AC asynchronous motors can be divided into two major categories: split-phase and shaded-pole. Split-phase single-phase motors use capacitors or resistors connected in series with the inductive starting winding to achieve phase shifting, causing the current phase of the starting winding to be offset from that of the running winding, known as "split-phase." Capacitor split-phase single-phase motor: Principle wiring diagram of a capacitor split-phase single-phase motor. Due to the significant phase-shifting effect of the capacitor, connecting a capacitor of appropriate capacity (generally about 20～50μF) in series with the starting winding can make the current phase difference between the two windings close to 90°. At this point, the resultant rotating magnetic field approximates a circular rotating magnetic field, resulting in high starting torque and low starting current. This type of single-phase motor is widely used. After starting, the capacitor can be retained as needed (called a capacitor-run motor) or disconnected (called a capacitor-start motor, executed by a centrifugal switch located inside the motor). If it is necessary to change the motor's direction of rotation, simply swap the output terminals of any one winding; this reverses the current phase relationship between the two windings. Resistance split-phase single-phase motor: The starting winding has fewer turns and thinner wires, resulting in lower reactance and higher resistance compared to the running winding. When using resistance split-phase starting, the current in the starting winding leads the current in the running winding, and the resultant magnetic field is an elliptical rotating magnetic field with high ellipticity. The starting torque is small, so it is only used for no-load or light-load applications and is less common. The starting winding of a resistance split-phase single-phase motor is generally designed for short-term operation; after starting, it is disconnected by a centrifugal switch, and the running winding maintains operation. Figure (b) shows the principle wiring diagram of a resistance split-phase single-phase motor.

oemer motor performance

The circuit driven by transistors, resistors, and diodes achieves adjustable speed forward and reverse drive for DC motors. The four diodes protect the transistors by preventing negative induced electromotive force generated by inductive components (motors) from impacting the transistors. When the 74LS00 output is at a low level, Q2 and Q4 are cut off, Q1 and Q3 conduct, and the output is at a high level. When the 74LS00 output is at a high level, Q2 and Q4 conduct, Q1 and Q3 are cut off, and the output is at a low level. Power supply voltage 15—30v, maximum continuous output current 500mA/per motor, short-time (10 seconds) can reach 700mA, PWM frequency can be up to 30kHz (generally used 1—10kHz). High-current traces should be as short and thick as possible, and vias should be avoided whenever possible. If vias must be used, make them larger (>1mm) and create a ring of small vias on the pad, filling them with solder during welding; otherwise, they may burn out. Additionally, if zener diodes are used, the wires from the transistor emitter and collector to the power supply and ground should be as short and thick as possible; otherwise, under high current, the voltage drop across these wires may pass through the diodes and conducting transistors, burning them out. PWM signals can be generated by timers, but since 51 internally provides only two timers, repeatedly setting the timer to output signals with different duty cycles to three or more DC motors is complex. We adopt a simpler method that not only provides different duty cycle input signals to more DC motors but also occupies only one timer resource. This method can be briefly described as follows: Store the duty cycle information required by each DC motor in a section of memory. If the duty cycle is 1, save 0FFH (11111111B); if the duty cycle is 0.5, save 0F0H (11110000B) or any binary number containing 4 0s and 4 1s. That is, duty cycle = number of 1s / 8. The specific binary number selected depends on the output frequency requirements. To output a PWM signal to this DC motor, simply shift once per time slice to extract a fixed bit (implemented using bit addressing or the carry flag C) and send it to the motor port. Additionally, the shift algorithm depends on previous results, so it is best to regularly check or reset the shifted number to prevent persistent errors due to incorrect shifting. The advantage of this algorithm is that it is an independent process capable of controlling multiple motors; the disadvantage is that it consumes more resources and has a lower PWM frequency.

oemer motor applications

The most widely used motors are AC asynchronous motors (also known as induction motors). They are easy to use, reliable, inexpensive, and robust in structure, but have a low power factor and difficult speed control. Large-capacity, low-speed prime movers commonly use synchronous motors. Synchronous motors not only have a high power factor, but their speed is independent of load size and determined solely by the grid frequency, offering stable operation. DC motors are often used in applications requiring wide-range speed control. However, they have commutators, complex structures, high prices, difficult maintenance, and are unsuitable for harsh environments. Since the 20s, specifically the 70s, with the development of power electronics technology, AC motor speed control technology has matured, equipment prices have decreased, and they have begun to be applied. The maximum output mechanical power that a motor can handle without overheating under specified duty cycles (continuous, short-time, intermittent periodic) is called its rated power; pay attention to the ratings on the nameplate during use. During operation, ensure that the load characteristics match the motor characteristics to avoid runaway or stalling. Motors provide a wide power range, from milliwatts to tens of megawatts. Motor use and control are very convenient, featuring self-starting, acceleration, braking, reversal, and holding capabilities to meet various operational requirements. Motors have high efficiency, produce no smoke or odor, do not pollute the environment, and generate low noise. Due to these advantages, they are widely used in industrial and agricultural production, transportation, national defense, commerce, household appliances, and medical electrical equipment. Generally, when a motor's speed is adjusted, its output power changes with the speed.

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