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江河数控、雕刻机

2013-06-18 11:01Stepper motor knowledge

What kinds of stepper motor?

Stepper motor of three types: permanent magnet (PM), reaction formula (VR) and a hybrid (HB). Permanent magnet stepper usually two-phase, torque and smaller, step angle of 7.5 degrees or 15. Reaction is generally three-phase stepper, can achieve high torque output, step angle of 1.5 degrees, but the noise and vibration are large, in Europe and other developed countries, the 1980s have been eliminated. Hybrid stepper is a mix of permanent magnet and reactive advantages, it is divided into two phases and five-phase, two-phase step angle of 1.8 degrees while the five-phase stepper angle of 0.72 degrees, this step into the motor of the most widely used.

What is a holding torque (HOLDING TORQUE)?
Holding torque (HOLDING TORQUE) is the stepper motor power but does not rotate, the stator locked rotor torque, which is a stepping motor of the most important parameters, usually the stepper motor at low speed torque to keep close , the stepper motor output torque increases with the speed constant attenuation, output power increases with the speed of change, it becomes a measure to maintain torque stepping motor of the most important parameters. For example, when people say 2N.m stepper motor, in the absence of special circumstances described refers to 2N.m holding torque stepper motor.

What is DETENT TORQUE?
DETENT TORQUE is a stepper motor is not energized, the stator locked rotor torque. DETENT TORQUE translations in the country there is no uniform way, easy to make people misunderstand, because the reaction is not stepping motor rotor permanent magnet material, so it does not DETENT TORQUE.

How much precision stepper motor? Whether cumulative?
General stepping motor step angle accuracy of 3-5%, and does not accumulate.

Stepper motor surface temperature is allowed to reach much?
First, the stepper motor causes the motor temperature is too high magnetic demagnetization, resulting in loss of torque down even further, so the motor surface temperature should be the maximum allowed depending on the motor magnetic demagnetization points. In general, the magnetic demagnetization points are above 130 degrees Celsius, some even as high as 200 degrees Celsius, so the appearance of stepper motor temperature is 80-90 degrees Celsius completely normal.
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