Common terms of the hottest stepper motor

  • Detail

Step angle: the angle at which the rotor turns when an electric pulse signal is input is called step angle. The size of the step angle can directly affect the operating accuracy of the motor. Whole step: the most basic driving mode. Each pulse of this driving mode makes the motor move by a basic step angle. For example, a standard two-phase motor has a total of 200 step angles in a circle, so in the full step driving mode, each pulse will move the motor by 1.80

half step: during single-phase excitation, the motor shaft stops at the full step position. After the driver receives the next pulse, if the driver excites the other phase and keeps the original phase in the excitation state, the motor shaft will move half a basic step angle and stop in the middle of the two adjacent full step positions. We changed our name. In this way, the two-phase coil is cycled for more than 10 years. If one day is rooted in the laboratory, and then the two-phase excitation is carried out, the stepping motor will rotate in the way of half a basic step angle per pulse

subdivision: subdivision refers to the fraction of the actual step angle when the motor is running, which is the basic step angle. For example, when the driver works in the 10 subdivision state, its step angle is only one tenth of the inherent step angle of the motor, that is, when the driver works in the non subdivision full step state, the control system sends a step pulse, and the motor rotates 1.8; When the subdivision driver works in the 10 subdivision state, the motor only rotates 0.18. The subdivision function is completely generated by the driver by accurately controlling the phase current of the motor, which is independent of the motor

holding torque: refers to the torque that the stator locks the rotor when the stepping motor is energized but does not rotate. It is one of the most important parameters of stepping motor. After years of development, the torque of stepping motor at low speed is close to the holding torque. As the output torque of the stepping motor decreases with the increase of speed, and the output power also changes with the increase of speed, the holding torque has become one of the most important parameters to measure the stepping motor. For example, when people say, 2n M stepper motor, without special instructions, refers to the holding torque of 2n M stepping motor

braking torque: refers to the torque when the stator locks the rotor when the stepping motor is not powered on. There is no unified translation method in China, which is easy to misunderstand

starting torque frequency characteristic: in the case of a given drive, the relationship between starting frequency and load torque is called starting torque frequency characteristic, also known as pull in characteristic, except that the moment of inertia of the load of these two new materials is fixed

operating torque frequency characteristic: when the load moment of inertia is constant, the relationship between operating frequency and load torque becomes the operating torque frequency characteristic, also known as pull-out characteristic

no load starting frequency: refers to the maximum pulse frequency that the stepping motor can start without losing step

static phase current: the current allowed to pass through each phase winding when the motor is not moving, that is, the rated current

main control signal

input signal

all signals are photoelectric isolated. In order to ensure the reliable conduction of the built-in high-speed optocoupler, it is required to provide the current driving capacity of the control signal at least 15mA. The optocoupler current limiting resistor has been connected in series inside the driver. When the input signal voltage is higher than 5V, the external resistor R can be connected in series to limit the current as required

selection of resistance value of current limiting resistance R:

when the signal output level of controller/actuator is +5v: r1=0, r2=0

+12v: r1=510, r2=820

+24v: r1=1.2k, r2=1.8k

output signal

the output signal of the driver is isolated and output through the optocoupler, and the driving current is 50mA

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