Recent content by awaiting

I uploaded a jpg of the routing. On top there are the power supplies, below it (from left to right) are the optocoupler, mosfet driver, one half bridge and the current sensors and the bottom part is the controller. It is a bit messy as of now as I wanted to test it on a single layer, then go for...

Thanks for the reply! I am using TMS320F28335 as the controller, the driver board consists of HCPL 4502 as the optocoupler and IR2104 as the MOSFET driver. I supplying 60VDC as the power supply and deriving the power supply for both the IC's using a DC-DC converter. I am facing some problems in...

Hi everyone, I wanted ask about the optocoupler circuit used to isolate a microcontroller and a motor driver board.Is it alright if I connect the input and output grounds together to make a common ground and connect it to the ground of the controller. I was of the opinion that an opto coupler...

Hesch, could you explain the process in a bit detail, as to what are the interval values. I only have feedback from a current sensor and incremental encoder to the PC. I am presently operating in open loop by giving three sine waves(120 degrees phase shifted) with a fixed input frequency. Do...

Thanks for the replies! Could you please suggest the steps to find the rotor characteristics from the torque slip curve. I havnt gone through the papers you have suggested but will read them in a day or two

Hi everyone, I am facing some problems in performing clarke-park transform for an induction motor(4 pole stator, squirrel cage IM). The motor is run with three sine wave inputs, 120 degrees phase shifted with each other. I am measuring the rotor position from the encoder and using twice of...

Sorry about that! Should have checked the links after posting them..anyways they are below.. Fig 1 Fig 2

Hi everyone, I am trying to implement the current control (Id, Iq) of a four pole PM synchronous motor. I am having trouble in making the Iq current follow a set reference. I had also implemented a cascaded speed control for a dc motor. In that case, I adjusted the gains of the PI...

Thanks for the reply! I did not get an email notification of your post, hence missed it. but I figured out the solution later on..

Hi everyone! I am trying to find the parameters of a surface mounted PM synchronous motor using the application note AN4680 (PMSM Electrical Parameters Measurement) and had some queries regarding it. The Ld process is mentioned as follows 1. Align the rotor to phase A. Phase A is connected to...

Thanks for the reply! Could you please explain how did you calculate the 15Hz value. I would also like to try the flywheel option. I am using 1N5822 diode across both the sides of the h-bridge, do you know of any other diode that could be useful.

It has 30 commutator blocks and 2 poles.

Hi everybody, I have implemented PI control of a DC motor and it works properly at high speeds (50rad/s) but if I lower the reference speed to 5 rad/s, there are fluctuations in its motion. Initially, I thought it could be due to the limitation of my current sensor (LTS 6 np) but I added some...

I am using IR2104 as the driver. It has turn on propagation delay of 820 ns (max) and turn on rise time of 170ns (max). This I assume gives the fastest time in which the driver can respond. So, it means I cannot get a frequency higher than 1MHz. But I want to test the circuit in 20KHz to 1MHz...

Hi everyone, I am using IRF530 in a half h bridge DC motor driver. The MOSFET is behaving erratically if the PWM frequency is increased above 20 KHz. I checked the datasheet thoroughly but could not find any thing related to maximum operating frequency. Is input capacitance related in any way...