reform motor Germany reform model reform price

reform motor is a discrete value control motor that converts electrical pulse excitation signals into corresponding angular or linear displacement. This motor moves one step for each input electrical pulse, so it is also called a pulse motor. It is a micro special motor that converts electrical pulse signals into angular displacement to control rotor rotation. It serves as an actuator in automatic control devices. For each input pulse signal, the stepper motor advances one step, hence it is also called a pulse motor. Stepper motors are widely used in peripheral equipment of digital computers, as well as in printers, plotters, and disk drives. The drive power supply of a stepper motor 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 the good coordination between the motor and the drive power supply. The advantages of stepper motors include no cumulative error, simple structure, convenient use and maintenance, low manufacturing cost, and high ability to drive load inertia. They are suitable for small and medium-sized machine tools and applications with low speed and precision requirements. The disadvantages are lower efficiency, significant heat generation, and occasional "step loss".

reform motor principle

A stepper motor is an open-loop control element that converts electrical pulse signals into angular or linear displacement. Under non-overload conditions, the motor's speed and stopping position depend solely on the frequency and number of pulses, unaffected by load variations; that is, each pulse signal causes the motor to rotate by one step angle. The existence of this linear relationship, combined with the characteristic that stepper motors have only periodic errors and no cumulative errors, makes control using stepper motors in applications such as speed and position very simple. Although stepper motors are widely used, they cannot be used under conventional conditions like ordinary DC or AC motors. They require a control system composed of dual-ring pulse signals, power drive circuits, and other components to operate. Therefore, effectively utilizing stepper motors is not easy, as it involves extensive professional knowledge in mechanics, motors, electronics, and computing. Nowadays, while there are indeed many manufacturers producing stepper motors, very few possess specialized technical personnel capable of independent development and research. Most manufacturers have only ten to twenty employees and lack even the most basic equipment, remaining merely in a stage of blind imitation. This causes considerable trouble for users in product selection and usage. In view of the above situation, we have decided to take the widely used variable reluctance stepper motor as an example to describe its basic working principle, hoping to assist users in product selection, usage, and overall machine improvement.

reform motor performance

Although the working principle of the motor is similar to that of a split-phase single-phase asynchronous motor, the former has a much larger rotor resistance than the latter. Therefore, compared with a single-unit asynchronous motor, the servo motor has three significant characteristics: 1, large starting torque. Due to the large rotor resistance, there is a clear difference compared to the torque characteristic curve of ordinary asynchronous motors. It allows the critical slip ratio S0 > 1, which not only makes the torque characteristic (mechanical characteristic) closer to linear but also provides a larger starting torque. Therefore, when the stator has a control voltage, the rotor rotates immediately, featuring fast start-up and high sensitivity. 2, wide operating range, 3, no self-rotation phenomenon. For a normally operating servo motor, as soon as the control voltage is lost, the motor stops immediately. When the servo motor loses control voltage, it enters a single-phase operating state. Due to the large rotor resistance, the two torque characteristics produced by the interaction of the two rotating magnetic fields in opposite directions in the stator with the rotor (T1－S1, T2－S2 curves) and the synthetic torque characteristic (T－S curve). The output power of AC servo motors is generally 0.1-100W. When the power frequency is 50Hz, voltages include 36V, 110V, 220, 380V; when the power frequency is 400Hz, voltages include 20V, 26V, 36V, 115V, and others. AC servo motors run smoothly with low noise. However, the control characteristic is nonlinear, and due to the large rotor resistance, losses are high and efficiency is low. Therefore, compared with DC servo motors of the same capacity, they are larger in volume and heavier in weight, so they are only suitable for small-power control systems of 0.5-100W.

reform motor structure

Motor rotor structure: The rotor is the rotating part of a three-phase asynchronous motor, consisting of the rotor core, rotor winding, shaft, and fan. The rotor core is also part of the motor's magnetic circuit, made of silicon steel sheets stamped with uniform linear slots on the outer circumference, laminated, and fixed on the shaft. The rotor winding is placed in the linear slots of the rotor core. Depending on the structure of the rotor winding, three-phase asynchronous motors can be divided into squirrel-cage type and wound-rotor type. The rotor winding of a squirrel-cage asynchronous motor is named for its shape resembling a squirrel cage; its structure consists of copper bars embedded in the slots as conductors, with the two ends of the copper bars welded together with short-circuit rings. Small and medium-sized squirrel-cage asynchronous motors use cheaper aluminum instead of copper, casting the rotor conductors, short-circuit rings, and fans into one unit to form a cast-aluminum squirrel-cage rotor. The core of a wound-rotor is the same as that of a squirrel-cage rotor. The rotor winding is similar to the stator winding, made of insulated wires wound according to a certain rule and embedded in the rotor slots to form a three-phase symmetrical winding. Usually, the ends of the three windings are connected together, and the starting ends are respectively connected to three mutually insulated copper slip rings fixed on the shaft, forming a star connection. The rotor winding is connected to an external three-phase rheostat through the slip rings and brushes above them, for motor starting and speed regulation within a small range. The working principles of squirrel-cage and wound-rotor three-phase asynchronous motors are the same; the only difference lies in the structure of the rotor winding.

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