dunkermotoren motors Germany dunkermotoren models dunkermotoren prices

dunkermotoren 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 driven by rectangular wave current are commonly referred to as permanent magnet brushless DC motors, while those driven by sine wave 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.

dunkermotoren motor performance

The motor is driven by a circuit composed of transistors, resistors, and diodes, achieving adjustable speed and forward/reverse drive for DC motors. Four diodes protect the transistors by preventing negative induced electromotive force generated by inductive components (the motor) from impacting the transistors. When the 74LS00 output is low, Q2 and Q4 are cut off, while Q1 and Q3 conduct, resulting in a high output level. When the 74LS00 output is high, Q2 and Q4 conduct, while Q1 and Q3 are cut off, resulting in a low output level. Supply voltage 15–30v, maximum continuous output current 500mA per motor; for short durations (10 seconds), it can reach 700mA. The maximum PWM frequency can be up to 30kHz (typically 1–10kHz). High-current traces should be as short and thick as possible, and vias should be avoided. If vias are necessary, make them larger (>1mm) and create a ring of small vias on the pad, filling them with solder during welding to prevent burnout. Additionally, if Zener diodes are used, the wires connecting the transistor emitter and collector to the power supply and ground should be as short and thick as possible; otherwise, the voltage drop across these wires during high current may destroy the diodes and conducting transistors. PWM signals can be generated by timers. However, since the 51 internally provides only two timers, outputting signals with different duty cycles to three or more DC motors would require repeatedly setting the timers, which 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 specific memory segment. 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 zeros (0) and 4 ones (1). That is, Duty Cycle = Number of ones (1) / 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. Furthermore, since the shifting algorithm depends on previous results, it is best to regularly check or reset the shifted number to prevent persistent errors caused by incorrect shifts. The advantage of this algorithm is that it operates as an independent process, allowing control of multiple motors; the disadvantage is higher resource consumption and lower PWM frequency.

dunkermotoren motor common questions

Why do motors generate shaft currents? The current in the loop formed by the motor shaft, bearing housing, and base is called shaft current. Causes of shaft current: (1) Asymmetric magnetic field; (2) Harmonics in the supply current; (3) Poor manufacturing or installation causing uneven air gap due to rotor eccentricity; (4) Gaps between the two halves of a detachable stator core; (5) Improper selection of the number of segments in a fan-shaped laminated stator core. Hazards: Erosion of the motor bearing surface or balls, forming pinpoint micro-pores, deteriorating bearing performance, increasing friction loss and heat generation, ultimately leading to bearing burnout. Prevention: (1) Eliminate pulsating magnetic flux and power harmonics (e.g., install AC reactors on the inverter output side); (2) During motor design, insulate the bearing housing and base of sliding bearings, and insulate the outer ring and end cap of rolling bearings. Two Why are general motors unsuitable for high-altitude regions? Altitude adversely affects motor temperature rise, corona discharge (in high-voltage motors), and commutation in DC motors. Attention should be paid to the following three aspects: (1) At high altitudes, motor temperature rise increases, and output power decreases. However, if the decrease in ambient temperature with altitude sufficiently compensates for the effect on temperature rise, the motor's rated output power can remain unchanged; (2) Anti-corona measures must be taken when using high-voltage motors at high altitudes; (3) Altitude adversely affects DC motor commutation, so careful selection of carbon brush materials is required. Three Why should motors not operate under light load? Light load operation causes: (1) Low motor power factor; (2) Low motor efficiency. This results in equipment waste and uneconomical operation. (1) Excessive load; (2) Phase loss; (3) Blocked air ducts; (4) Prolonged low-speed operation; (5) Excessive power harmonics. Four Why should motors in cold environments not be started arbitrarily? Prolonged exposure to low temperatures can cause: (1) Motor insulation cracking; (2) Freezing of bearing grease; (3) Pulverization of solder at wire joints. Therefore, motors in cold environments should be stored with heating, and windings and bearings should be inspected before operation. Five What are the causes of three-phase current imbalance in motors? (1) Three-phase voltage imbalance; (2) Poor welding or contact in a internal phase branch of the motor; (3) Inter-turn short circuit, ground fault, or phase-to-phase short circuit in the motor winding; (4) Wiring errors.

dunkermotoren motor development history

Evolution of electric motors: By changing the positions of the stator and rotor in a permanent magnet DC motor, a permanent magnet brushless DC motor can be obtained. It should be noted that the term "DC" is misleading, as it does not refer to a DC motor; in fact, it is powered by an AC square wave, so it is also called a permanent magnet brushless square wave motor. Its greatest advantage is being brushless, eliminating many problems caused by brushes. Moreover, the interaction between square wave current and square wave magnetic field can generate greater torque. The full name provided by Professor Shen Dawei of Foshan Lighting is "permanent magnet brushless square wave torque motor." Replacing the excitation winding of a traditional synchronous motor with permanent magnet material eliminates the copper losses associated with traditional brushes, slip rings, and excitation windings. Due to the use of sinusoidal AC power and a brushless structure, it is also called a permanent magnet brushless AC motor. Its advantages include high energy density and high efficiency, a wider speed range in the constant power region, and the ability to meet the high-performance requirements of electric vehicles through vector control methods. Asynchronous motors are characterized by simple structure, durability, low cost, reliable operation, low torque ripple, low noise, no need for position sensors, and high maximum speed. Vector control speed regulation technology for asynchronous motors is relatively mature, giving asynchronous motor drive systems significant advantages. Therefore, they were applied earlier to electric vehicle drive systems and remain the mainstream product for electric vehicle drive systems (especially in the United States), but they are gradually being replaced by other new types of brushless permanent magnet traction motor drive systems. The biggest disadvantages are complex drive circuits and high costs; compared to permanent magnet motors, asynchronous motors have lower efficiency and power density.

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