STROETR motor Germany STROETR model STROETR price

STROETR 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 are 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, high heat generation, and occasional "step loss".

STROETR motor common problems

Why can't the motor be connected to a 50Hz power supply? During motor design, the silicon steel sheets are generally operated in the saturation region of the magnetization curve. When the power supply voltage is constant, reducing the frequency increases the magnetic flux and excitation current, leading to an increase in motor current and copper losses, ultimately causing an increase in motor temperature rise. In severe cases, the motor may burn out due to overheating of the coils. Seven. What are the causes of motor phase loss? Power supply side: (1) Poor contact of the switch; (2) Broken transformer or line; (3) Blown fuse. Motor side: (1) Loose screws in the motor junction box causing poor contact; (2) Poor internal wiring soldering; (3) Broken motor winding. Eight. What are the causes of abnormal motor vibration and noise? Mechanical aspects: (1) Poor bearing lubrication, bearing wear; (2) Excessive bearing housing size. (3) Loose fastening screws; (4) Debris inside the motor. Electromagnetic aspects: (1) Motor overload operation; (2) Unbalanced three-phase current; (3) Phase loss; (4) Short circuit fault in stator or rotor windings; (5) Open welding in cage rotor bars causing broken bars. Nine. What are the causes of motor bearing overheating? Motor itself: (1) Tight fit between inner and outer bearing rings; (2) Problems with form and position tolerances of components, such as poor coaxiality of the base, end cover, and shaft; (3) Improper bearing selection; (4) Poor bearing lubrication or unclean bearing cleaning, debris in the grease; (5) Shaft current. Usage aspects: (1) Improper unit installation, such as non-compliant coaxiality between the motor shaft and the driven device shaft; (2) Over-tightened belt pulley; (3) Poor bearing maintenance, insufficient grease or expired grease becoming dry and deteriorated. Ten. What are the causes of low motor insulation resistance? (1) Windings damp or water ingress; (2) Accumulation of dust or oil stains on windings; (3) Insulation aging; (4) Damage to motor lead wires or terminal board insulation.

STROETR motor control principle

The motor control principle requires the control unit to determine the sequence for turning on the power transistors in the inverter based on the rotor position sensed by the hall-sensor. This involves the AH, BH, CH (known as upper arm power transistors) and AL, BL, CL (known as lower arm power transistors) in the inverter. This causes current to flow sequentially through the motor coils, generating a forward (or reverse) rotating magnetic field that interacts with the rotor magnets, thereby enabling clockwise/counter-clockwise rotation. When the motor rotor rotates to a position where the hall-sensor senses another set of signals, the control unit turns on the next group of power transistors. This cycle allows the motor to continue rotating in the same direction until the control unit decides to stop the rotor by turning off the power transistors; to reverse the rotor, the power transistor switching sequence is reversed. Basically, the power transistor switching can be exemplified as follows: AH and BL pair → AH and CL pair → BH and CL pair → BH and AL pair → CH and AL pair → CH and BL pair. However, AH and AL, or BH and BL, or CH and CL must never be turned on simultaneously.

STROETR motor mechanical characteristics

The characteristic of motor speed n varying with torque T [n=f(T)] is called the mechanical characteristic. It is an important basis for selecting electric motors. Various types of motors are suitable for different applications due to their specific mechanical characteristics. From the perspective of the DC motor armature circuit, the power supply voltage U must balance the motor's back EMF Ed and the voltage drop across the armature circuit resistance Rd caused by the armature current Id, i.e., U=Ed+IdRd. The back EMF is related to the motor speed n and magnetic flux φ, and the armature current is related to the mechanical torque M and magnetic flux φ, i.e., z4 series DC motor, Ed=Cφn, M=CφId, where C is a constant. Thus, n0 is the no-load speed, and k is Rа/C2. The above represents the ideal relationship without considering factors such as iron core saturation, but it is also instructive for the analysis of actual DC motors. As seen above, DC motors have 3 speed control methods: adjusting excitation current, adjusting armature terminal voltage, and adjusting the resistance inserted in the armature circuit. Adjusting the series resistance in the armature circuit is relatively simple but consumes more energy; furthermore, at light loads, the voltage drop across the series resistance is small due to low load current, making speed regulation insensitive. Adjusting the armature terminal voltage and appropriately adjusting the excitation current allows smooth speed control of the DC motor over a wide range. Increasing terminal voltage raises speed, while increasing excitation current lowers speed; proper coordination of the two allows the motor to operate at different speeds. During speed control, attention should be paid to the fact that commutation conditions deteriorate at high speeds, and cooling conditions worsen at low speeds, thus limiting the motor's power. Series-wound DC motors, due to their mechanical characteristics (Fig. 2) approaching constant power characteristics and high torque at low speeds, are widely used for electric vehicle traction. In trams, two or more compound-wound DC motors (having both series and shunt excitation) are often used for joint drive. By using series-parallel reconnection methods, the motor terminal voltage can be changed by multiples (in series, the motor terminal voltage is only half of that in parallel), thereby economically achieving a wider speed control range and reducing energy consumption during startup.

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