I like servo motors because: they are quiet, more power at high rpms, machines can move at least three times faster than steppers, rotational movement is smooth instead of jerky.

Servos produce more torque at any speed than comparable stepper motors. This can be up to 400% more torque for equally rated motors. Servos are under closed-loop control via their encoders, allowing additional power to be sent to the motor when resistance is encountered. Steppers, on the other hand, will simply stall and lose their position relative to the control -- resulting in improperly machined parts. See similar questions...

The two types of power supplies are regulated and unregulated. We prefer unregulated power supplies since the current doesn't "fold back" when it gets too high. However, an unregulated power supply's voltage may spike and blow the drive if you do not size the power supply's voltage a little lower than the drive's input voltage. The current on your power supply can be greater than the drive's, but it should not be less than the rated current of the motor. See similar questions...

Resonance is an unstable condition when running a step motor. Resonance usually occurs between 2-4 rev/sec and can be alleviated in most situations by putting a load on the motor, changing from full stepping to half or microstepping, or increasing your acceleration through the resonance zone. See similar questions...

A stepper motor controller, more generally called Motion controller, is a system that control the rotation of motors (stepper, brushless, sevomotors) with the purpose of moving a mechanical (axis in CNC machines) to a determined position. Motion controller must not be confused with motors drivers that are the power part of a positioning system. The firsts are those systems based on a PC that give the signals for the motors through the parallel port. See similar questions...

The resolution of an axis system moved by stepper motors depend uniquely by the mechanical. The stepper motors have generally a 1.8? step angle so they make a complete rotation with 200 step when drive at full step. For example, if the motor drive a screw of 4 mm., a complete turn will make a displacement of 4 mm. and so the resolution will be 4/200 mm= 0.02 mm. Obtaining a mechanical with backslash less than this is very difficult. See similar questions...

The moderns stepper motors can reach rotation speed of 1500 RPM. It must be considered that the motor torque curve decrease considerably with the increasing of the step frequency. If we take a screw of 4 mm and we run it at 1500 RPM we obtain a displacement speed of 1500*4mm=6000mm/min or 6 m/min. In practice the stepper motors runs at max 600 RPM because the torque decrease above that values. See similar questions...

The easiest way to choose a motor is to look at our torque vs. speed curves in our catalog and see what type of drive was used with a particular motor. Another method is to find the output power of the motor shaft where: P = T*W/22.5 P is Power in Watts T is the torque in oz-in W is the rotational speed in rev/sec. Take this number and double it. The resulting power will allow you to adequately size the drive for the application. See similar questions...

A tachometer is a speed measurement device. PMC controllers do not require tachometers for motor control. A tachometer is only used to measure and feed the motor's velocity back to a velocity mode amplifier. See similar questions...

Most stepper motors have class B insulation which is rated at 130 degrees C. Motor case temperatures of 90 degrees C will not cause thermal breakdowns. Motors should be mounted where operators cannot come into contact with the motor case. See similar questions...

For safety reasons, an engineer wants to know how long it takes for a drive's DC Bus to dissipate once the main power is disconnected. In theory, the drive's bus will never dissipate completely due to the logarithmic behavior of the DC Bus capacitor but in actuality we can do the calculations based on a final voltage that approaches zero volts. The minimum amount of time required before the drive dissipates the voltage can be worked out as follows: Motor Resistance (D062M) = Rm = 3. See similar questions...

If you are only operating one stepper motor using any of our boards which have the GenStepper firmware installed, and if that motor does not require use of the Double Current Mode of operation, then you may operate up to 2 relays at the same time as you operate the stepper motor. The manual is in Adobe Acrobat format, and is available from our downloads page here. See similar questions...

Back-up/emergency steering and rudder system ? fully operational 'ready to go' and better than other methods Unmatched course control - can straighten the wake and reduce yaw - more comfortable, faster and safer No unwieldy lines in the cockpit - just 'click' into gear - no constant attention to lines, adjusting and re-tensioning Suitable for situations that are difficult or impossible for servo pendulums: multihulls, off centre, hydraulic steering, external rudders, centre cockpits and stiff st. See similar questions...

Servos have 180 degrees of rotation so it must be centered halfway between the directions of horizontal and vertical polarities. When properly installed the servo should have freedom to move the 90 degrees to change polarity yet also have extra room to move past either of these points in case you need to fine tune the skew. On a Precision feedhorn a servo will be facing straight up and down when you are facing straight south. See similar questions...

Nearly all experts recommend choosing an instructor, not gear, when you first get started. Do ask about cage safety: ask how well the cage protects you hands (see A better Paramotor), a leading cause of pilot injury. Your success is far more dependant on good training than what type of equipment you buy. The instructor will know your tradeoffs because it depends on quite a few things: how you plan on traveling with it, what elevation you'll be flying from, how much you weigh and others. See similar questions...

In our catalogs are various torque vs. speed curves. When you know the torque required and your top motor speed (rev/sec), look at these curves to determine which motor will work for you. We recommend doubling (100% safety factor) your required torque at a given speed and then selecting a motor/drive/power supply combination that can deliver that torque (i.e. If you need 100 oz-in to the system, get a motor that produces 200 oz-in at that speed). See similar questions...

A servo is a type of closed-loop feedback circuit. A servo motor works by comparing the motor's actual position (as read from a feedback device - usually a position encoder) to the desired position (as calculated by the motion controller) and by dynamically adjusting the motion controller's command output signal so as to try to minimize the difference (error) between the two. See similar questions...

More info being compiled, but for now, check out the excellent Servo Spec Chart from Matt Verrochi's page. See similar questions...

In most cases weight matching of the pistons and rods/rod bolts is all that's required. The inline six is naturally balanced against first and second order harmonics and the crankshaft/counterweights usually don't require spin balancing, but having this done will improve engine smoothness at high rpm and lessen harmful vibrations. The Jeep I6 motor is internally balanced so the addition of the flywheel and harmonic balancer isn't necessary for the spin balancing procedure. See similar questions...

The Austin Air Cleaner's Permanent Split Capacity motor costs 50% less to operate than most other air purifiers' motors. The motor uses 90 watts of electricity when run on high. The motor is capable of running 24 hours a day and it will not overheat. See similar questions...