How to Bumplessly Switch Between Two Control Signals?

Effectively you want to maintain a current signal during switchover. Inductors are to current signals what capacitors are to voltage signals, so an inductor and a path to ground ought to do it:simulate this circuit Schematic created using CircuitLabWhen the switch disconnects briefly, the inductor maintains the current into R1 for a little while. D1 provides the return path in this situation.

Unfortunately with a 500Ohm burden you'd need a very large inductor in order to get ride-through in the order of milliseconds. Check your SEW's input circuit - if it uses a smaller burden you can get away with a smaller inductor

I have a Labview program which sends 4-20ma current signal through a ni usb device to control the speed of a motor by controlling a sew eurodrive MOVIDRIVE MDX60B / 61B. Here is the data sheet of MOVIDRIVE: PAGE 60 shows the layout of signal terminals. On the actual device, the input terminals are just two normal terminals,nothing special.

Originally, this motor is controlled by manually pushing some physical buttons on a device. The device is just some kind of signal generator that generats 4-20ma current signal.

The MOVIDRIVE MDX60B / 61B is set to accept 4-20ma current signal as control input.

So how can I switch between the two control signals (1.from labview, 2. from the device) so that there won't be any gap between the switch? I want to accomplish this because if the control signal drops to 0 at some point, the driver may get damaged. Since these equipment (both the movidrive and the motor) is really expensive and important, I can't risk damaging them by placing a switch in the circuit and just switch between the signals. Any advice is much appreciated!

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You use different speed taps for heat then you do cooling....have a tech come out and hand wire unit to your heat/furnace fan long as bearings are ok....if you are trying to get by w/0 changing motor this would be only way. but its the motor. use your high winding and use it for cooling/not the greatest and will increase air flow in cool mode resulting in not as good dehumidification.but have a tech come out...describe your problem...make sure hes familiar with that make n model.most have a insert type ice cube fan speed relay. ....have him Meg the fan motor etc . ...or at least check motor thoroughly. ..if you have a burnt winding then replace motor...relays only interfere with operation if they are burnt/and are causing a voltage drop.also most furnaces have 115 volt motors back then or shaded pole motors. but there were a few 230 volt motors used if so it will have a dedicated run capacitor.something that would be checked all in the service call1. Robot Platform | Knowledge | How Electric Motors WorkElectric motors are found in most electrical and electronic appliances: Fans, drillers, electric engines, DVD players, washing machines etc. creating rotary motion. They are also used in saw mills and cutters where these motors are mechanically designed to create linear motion. Electric motors are based on the principle of electromagnetism. The mechanical construction uses two main components; a Stator and a Rotor. Stator (as in stationary) is a stationary component of the motor and rotor is a rotating component. Stator generally has permanent magnets (in some cases electromagnetic windings), and rotor has electromagnets (in some cases permanent magnets) attached. Ideally one of the two is a permanent magnet and the other is an electromagnet. When electric current passes through the electromagnet, it creates a magnetic field generating a magnetic force between the stator and the rotor. The attractive and repulsive forces between the electromagnet and the permanent magnet make the rotor to turn and rotate. To get the rotor to turn, the electromagnets create a repulsive force at one end (pole) which attracts the permanent magnet towards the other end of the electromagnet.Once the rotor does a half-turn, the poles of the electromagnet flips (North to south or south to North) pushing the rotor further towards the other end. The process continues creating a circular motion. Number of times the rotor rotates in one minute determines the velocity of the motor, measured as Revolutions per Minute (RPM). Hence whenever you intend to buy a motor, always watch out for RPM and torque of the motor. Installing gears can increase either torque or velocity, but reducing the other. AC Motor: Motors are designed to run on Alternate current (AC) or Direct Current (DC). However, it is very uncommon to use AC motors in our mobile robots as they are harder to use, and most of our robots and circuits are DC powered. Therefore use of AC powered motor is limited to stationary and industrial robots. DC motor: DC motors are very easy to implement and most commonly used actuators in robots. There are different types of DC motors available and in the next section, we will discuss the various DC motors available.2. How does the Koenigsegg Regera work?Well, you have posted the link to the website, where they explain it, and also give this image:There are three E-motors. Two on the axes, and one on the same shaft as the combustion motor (C-motor), which connects to the axes via a hydraulic coupling and a differential with a ratio of 2.73Now, let's play with that numbers. The C-motor has its red line at 8250RPM, so it turns the axes at 8250RPM/2. 73=3022RPM. The rear wheel dimensions are 345/30 R20 Y, which means they have a circumference of 2.17m. 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